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  • A 2-D imaging-assisted geometrical transformation method for non-destructive evaluation of the volume and surface area of avian eggs
    Food Control (IF 4.248) Pub Date : 2020-01-17
    Valeriy G. Narushin; Gang Lu; James Cugley; Michael N. Romanov; Darren K. Griffin

    Egg volume and surface area are reliable predictors of quality traits for both table and hatching chicken eggs. A new non-destructive technique for the fast and accurate evaluation of these two egg variables is addressed in the present study. The proposed method is based on the geometrical transformation of actual egg contour into a well-known geometrical figure which shape most of all resembles the examined egg. The volume and surface area of an examined egg were recomputed using the formulae appropriate for three figures including sphere, ellipsoid, and egg-shape ovoid. The method of the geometrical transformation includes the measurements of the egg length and the area of the examined eggs. These variables were determined using two-dimensional (2-D) digital imaging and image processing techniques. The geometrical transformation approach is proven to be reliable to turn the studied chicken eggs into the three chosen ovoid models, with the best prediction being shown for the ellipsoid and egg-shape ovoid, whilst the former was slightly more preferable. Depending on the avian species studied, we hypothesise that it would be more suitable to use the sphere model for more round shaped eggs and the egg-shaped ovoid model if the examined eggs are more conical. The choice of the proposed transformation technique would be applicable not only for the needs of poultry industry but also in ornithological, basically zoological studies when handling the varieties of eggs of different shapes. The experimental results show that the method proposed is accurate, reliable, robust and fast when coupled and assisted with the digital imaging and image processing techniques, and can serve as a basis for developing an appropriate instrumental technology and bringing it into the practice of poultry enterprises and hatcheries.

    更新日期:2020-01-17
  • Dietary exposure and health risk characterization of aflatoxin B1, ochratoxin A, fumonisin B1, and zearalenone in food from different provinces in Northern Vietnam
    Food Control (IF 4.248) Pub Date : 2020-01-17
    Tuan Huu Do; Son Cao Tran; Chi Dinh Le; Binh Thi Ha Nguyen; Thao Thi Phuong Le; Hao Thi Hong Le; Tuyen Danh Le; Thu Hung Thai-Nguyen

    A dietary exposure and health risk assessment of mycotoxins including aflatoxin B1, fumonisin B1, ochratoxin A, and zearalenone was conducted in 3 provinces in Northern Vietnam namely Hanoi, Thanh Hoa, and Ha Giang. Results of the analysis of samples of maize, rice, peanut, and sesame revealed the presence of these mycotoxins in all samples and sampling locations. Aflatoxin B1 was the most frequently detected (19.1%) and widely distributed among different types of samples, whereas the percentage occurrence of fumonisin B1, ochratoxin A, and zearalenone were 11.2, 5.9 and 6.3, respectively. The later three mycotoxins were detected mostly in maize. The exposure to aflatoxin B1 at detected levels could lead to 0.23, 0.65 and 21.0 cases of liver cancer per 100,000 adult people per year in Hanoi, Thanh Hoa and Ha Giang, respectively. The risk assessment also showed the unsafe exposure to ochratoxin A and fumonisin B1 in the highland region where the people consume a large amount of foods derived from maize. In Ha Giang, the mean exposures to fumonisin B1 were lower than its PMTDI (Provisional Maximum Tolerable Daily Intake), however, the 95th percentile values were 1.1–1.9 times of the PMTDI. The mean exposures to ochratoxin A in Ha Giang were about 2.4–3.6 times higher than its PMTWI (Provisional Maximum Tolerable Weekly Intake). There was no risk of fumonisin B1 and ochratoxin A in Hanoi and Thanh Hoa. The dietary exposure to zearalenone was within its PMTDI in all locations. The results pointed out the need for further improvement of the control of these mycotoxins in Vietnam, especially in some highland provinces.

    更新日期:2020-01-17
  • Groove fabrication on surface of soft gelatin gel utilizing micro-electrical discharge machining (Micro-EDM)
    J. Food Eng. (IF 3.625) Pub Date : 2020-01-17
    Takayuki Tamura; Ryotaro Akiyama; Ryu-ichiro Tanaka; Hiroyuki Kawamoto; Shinjiro Umezu

    This paper reports the utilization of micro-electrical discharge machining (EDM) to process gelatin gel, which is a soft food material. The influence of the applied voltage and selected electrodes on the processed shape was investigated. In addition, using safflower oil in the process can produce narrow grooves. The results showed that micro-EDM with safflower oil can produce micro-grooves (width equal to 2 μm), and alphabet characters can be engraved into gummy candy and jelly, which are foods containing gelatin. These findings are indicating a potentially powerful tool to produce impressive appearance by fabricating micro texture on gelatin foods.

    更新日期:2020-01-17
  • Ultrasonication of Milky Stage Rice Milk with Bioactive Peptides from Rice Bran: Its Bioactivities and Absorption
    Food Bioproc. Tech. (IF 3.032) Pub Date : 2020-01-17
    Samuchaya Ngamsuk, Jue-Liang Hsu, Tzou-Chi Huang, Prisana Suwannaporn

    Abstract Rice in early development stage contains peptides and various bioactive compounds. Rice protein hydrolysate was prepared from Riceberry bran protein hydrolysed with Alcalase® and trypsin. Protein hydrolysate from Alcalase® (MW < 3 kDa) was fractionated into 12 fractions using RP-HPLC and tested for antioxidant, ACE, and ROS-inhibitory activity. Peptide from RP-HPLC fraction 1 showed that the lowest ROS inhibition and highest antioxidant were identified by LC-MS/MS as Val-Leu-Ala-Ala-Gly-Cys-Pro-Leu. Peptide fraction 4 showed that the strongest in vitro ACE-inhibitory activity was identified as Ala-Met-Ser-Phe-Ala-Glu-Met. Young Riceberry milk was then enriched with Alcalase® protein hydrolysate (MW < 3 kDa) and sonicated at amplitude 20% for 30 min and 40% for 60 min. Particle size, transmittance, and Caco-2 cell absorption were measured. The highest peptide content and % absorption was found in young rice milk ultrasonicated at 40% for 60 min. Rice bran protein hydrolysate produced by Alcalase® had much smaller MW bioactive peptides and could be used as a potent functional food ingredient. The young rice milk fortified with bioactive peptides after high power ultra-sonication could increase the in vitro intestinal absorption.

    更新日期:2020-01-17
  • A Review on the Potential Reuse of Functional Polysaccharides Extracted from the By-Products of Mushroom Processing
    Food Bioproc. Tech. (IF 3.032) Pub Date : 2020-01-16
    Chung-Yi Wang

    Abstract Mushrooms contain many types of nutrients; they are widely regarded as healthy food product. The development of the global mushroom industry has resulted the production of by-products such as stipes, discarded space bags, and broken fruiting bodies. Mushroom by-products account for approximately 20% of mushroom weight and have a high recycling value. Mushroom by-products are most commonly used as compost and animal feed. They contain large amounts of polysaccharides, triterpenes, ergosterol, glycoproteins, dietary fiber, and other components from which functional components could be extracted. Among those components, polysaccharides have been widely studied. This review paper evaluated current research findings, which revealed that new extraction techniques such as microwave, ultrasound, pulsed electrical fields, and high pressure could be used to increase the efficiency of polysaccharide recovery from mushroom by-products. We also separately discussed the functionality of various types of polysaccharides extracted from different mushroom by-products with regard to immune regulation, alleviation of cardiovascular disease, protection of intestinal health, as well as anticancer, antibacterial, and other health promoting effects. This review highlights that mushroom waste contains many types of functional polysaccharide components that have potential applications in foodstuffs and medicine. The use of new extraction techniques can improve the utilization of whole mushrooms. Effective recovery of polysaccharide components from mushroom by-products can increase the overall value of mushroom cultivation and decrease the production of agricultural waste.

    更新日期:2020-01-17
  • Camellia Sinensis and Litsea Coreana Ameliorate Intestinal Inflammation and Modulate Gut Microbiota in Dextran Sulfate Sodium‐Induced Colitis Mice
    Mol. Nutr. Food Res. (IF 4.653) Pub Date : 2020-01-17
    Yan Liu; Xinghua Wang; Qiubing Chen; Liyong Luo; Mengjun Ma; Bo Xiao; Liang Zeng

    Polyphenol‐enriched herbal extracts have been proved as alternative therapeutic strategies for experimentally‐induced colitis. We comparatively explored the in vivo and in vitro anti‐inflammatory effects of Camellia sinensis (green, white, yellow, oolong, black, and dark tea) and Litsea coreana (hawk tea).

    更新日期:2020-01-17
  • Plasma Phospholipids with Long Chain Polyunsaturated Fatty Acids and Dihydroceramides at the Crossroads of Iron Stores and Insulin Resistance
    Mol. Nutr. Food Res. (IF 4.653) Pub Date : 2020-01-16
    Jordi Mayneris‐Perxachs; Aya Mousa; Negar Naderpoor; José‐Manuel Fernández‐Real; Barbora de Courten

    Iron plays an important role in the pathogenesis of insulin resistance (IR) and type 2 diabetes. Recent studies suggest a role of specific lipids in the induction of IR, but the potential relationships between iron and lipid metabolites in relation to IR have not been explored. Therefore, we aimed to evaluate the association among iron, IR, and the lipidome.

    更新日期:2020-01-17
  • Plant‐ and Fish‐Derived n‐3 PUFAs Suppress Citrobacter Rodentium‐Induced Colonic Inflammation
    Mol. Nutr. Food Res. (IF 4.653) Pub Date : 2020-01-16
    Pekka Määttänen; Eberhard Lurz; Steven Botts; Richard Y. Wu; Shaiya C. Robinson; C. William Yeung; Romain Colas; Bo Li; Kathene C. Johnson‐Henry; Marc E. Surette; Jesmond Dalli; Philip M. Sherman

    Marine‐derived n‐3 PUFAs may ameliorate inflammation associated with inflammatory bowel diseases. Plant‐derived n‐3 PUFAs are thought to be inferior owing to shorter chain lengths. The aim of this study was to compare the impact of plant‐ and fish‐derived PUFAs on murine colitis.

    更新日期:2020-01-17
  • Dietary polyphenols turn fat “brown”: A narrative review of the possible mechanisms
    Trends Food Sci. Tech. (IF 8.519) Pub Date : 2020-01-17
    Jiamiao Hu; Zhenyu Wang; Bee K. Tan; Mark Christian

    Background Inducible brown adipocytes called beige adipocytes are found in white adipose tissue (WAT) depots. They express functional UCP1 and have thermogenic fat-burning capacities as also found in classical brown adipocytes in response to various stimuli. Beige adipocytes may also secrete certain factors that affect WAT function and systemic metabolism. Therefore, a white-to-brown fat conversion could be a novel therapeutic avenue for tackling obesity and metabolic disorders. Scope and approach In this review, we examine the evidence supporting the concept that the anti-obesity action attributed to polyphenols might be contributed by their stimulation of WAT browning, and discuss the possible underlying mechanisms involved in this action. Key findings and conclusions Current evidence, mostly derived from animal models, strongly supports that dietary polyphenols may play roles in the browning of WAT. Studies also show multiple signaling pathways, receptors, and transcription factors have been associated with the browning effects of dietary polyphenols. In conclusion, polyphenol compounds and their principal metabolites may contribute to counteracting human obesity via promoting WAT browning.

    更新日期:2020-01-17
  • Recent advances in subcritical water and supercritical carbon dioxide extraction of bioactive compounds from plant materials
    Trends Food Sci. Tech. (IF 8.519) Pub Date : 2020-01-16
    Sinemobong O. Essien; Brent Young; Saeid Baroutian

    Background Subcritical water (SWE) and supercritical carbon dioxide extraction (SCCO2) are novel extraction techniques for recovering compounds with food-enhancement and health promoting properties, from various plants and biomaterials. These extraction techniques are efficient, economical and promising routes for resource recovery without compromising the quality of the extracted products. Scope and approach Here, the theoretical background, practical application and recent trends associated with the use of SWE and SCCO2 in the recovery of bioactive compounds from plant sources are presented. The paper is organised to allow a refreshed understanding of the main features, benefits, challenges, and possible solutions involving SCCO2 and SWE based on the enormous number of scientific publications and the very few industrial applications in the public domain. The utilisation of these methods are advantageous in selective extraction of better-quality compounds at lowest potential environmental impact. Furthermore, two research publication databases were queried using specific criteria to show the progress and growth in interest on SWE and SCCO2. Key findings and conclusions Subcritical water and supercritical carbon dioxide are viable extraction techniques for recovery of bioactive compounds. These techniques, standalone or combined sequentially or with other extraction methods, enhance yield and quality of thermally liable compounds. Mathematical models having a strong correlation with experimental data can also be used to predict and monitor the process kinetics. Our findings should be beneficial for professionals concerned with the application of technology in the development of new and existing food products, their storage and marketability.

    更新日期:2020-01-17
  • Plant proteins as high-quality nutritional source for human diet
    Trends Food Sci. Tech. (IF 8.519) Pub Date : 2020-01-16
    Amanda Gomes Almeida SÁ; Yara Maria Franco MORENO; Bruno Augusto Mattar CARCIOFI

    Background Adequate human nutrition depends on the ingestion of many nutrients present in the diet. Proteins are indispensable macronutrients, including the essential amino acids. A protein source can vary its nutritional quality in terms of digestibility, amino acid profile, and its bioavailability. There are several disadvantages claimed to livestock and traditional animal protein sources. Thus, in a continuous increasing world population, a current challenge is the consumption of proteins with low-cost and easily supply, meeting environmental and social aspects. Scope and approach Plant proteins may be a critical step for reducing animal protein dependence by humans. This critical review contributes to facilitating the choice of a plant protein source based on the amino acid composition. Additionally, this overview can give insights into the development of new food products and add value to agro-industrial wastes and by-products. Furthermore, this paper shows the wide variety of sources of plant proteins, with balanced nutritional quality and high protein content as a potential protein supply for the human population and industrial applications. Key findings and conclusion A significant challenge is encountering the most suitable protein source since it depends on consumers' preferences, industrial availability, geographical location, and cultural elements. Nevertheless, it is possible to select a plant protein source comparing the essential amino acid composition of each source to the reference pattern.

    更新日期:2020-01-17
  • Soluble dietary fiber and polyphenol complex in lotus root: preparation, interaction and identification
    Food Chem. (IF 5.399) Pub Date : 2020-01-17
    Shuyi Li; Junsheng Li; Zhenzhou Zhu; Shuiyuan Cheng; Jingren He; Olusola Lamikanra

    In order to further determine the interaction between polysaccharides and polyphenols, the complex of soluble dietary fiber (SDF) and two phenols were prepared. According to the results, at the conditions of pH=4, temperature=60°C, concentration ratio of polysaccharide and phenol=4:1, the maximum adsorption of catechin and gallic acid in the SDF complex was 155.74 and 134.05 mg/g, respectively. Due to UV-Vis and FT-IR analysis, it could be speculated that the interaction between SDF and phenols resulted in chemical combination. Furthermore, the monosaccharide composition and molecular weight distribution of SDF were significantly altered after conjugated with phenols. However, it showed no significant difference between two different SDF-phenol complexes, referring to GC and GPC data. The surface of SDF-phenol complex was loose with uniform arrangement, while the physical mixture surface was porous with irregular holes and cracks. Both SDF-CC and SDF-GA complex indicated higher thermal stability than the mixtures by TGA analysis.

    更新日期:2020-01-17
  • Micro solid phase extraction of parabens from breast milk samples using Mg-Al layered double hydroxide functionalized partially reduced graphene oxide nanocomposite
    Food Chem. (IF 5.399) Pub Date : 2020-01-17
    Mahshid Manouchehri; Shahram Seidi; Ahmad Rouhollahi; Haniyeh Noormohammadi; Maryam Shanehsaz

    In this study, a magnesium-aluminum layered double hydroxide coated on graphene oxide nanosheets was synthesized. It was successfully applied as an effective medium for determination of the parabens in human breast milk samples using micro solid phase extraction by packed sorbent (in spinal syringe format) followed by HPLC-UV. Effective parameters were optimized by central composite design. Under the optimal conditions, figures of merit of the developed method were obtained in which the limits of detection were found between 3.0-5.0 µg L-1. The calibration plots were linear in the range of 10-1000 µg L-1. Intra- and inter-day RSD% (n = 3) at two concentration levels of 25 and 250 µg L-1 varied between 4.2-9.5%. The relative recovery values for the spiked breast milk samples were in the acceptable range of 87.2-104.4%. Accordingly, the proposed method exhibits proper sensitivity, good repeatability, and acceptable applicability for the determination of parabens in complex matrices.

    更新日期:2020-01-17
  • Differentiation of fresh and thawed Atlantic salmon using NMR metabolomics
    Food Chem. (IF 5.399) Pub Date : 2020-01-17
    Elena Shumilina; Ida Aksland Møller; Alexander Dikiy

    NMR metabolomics approach was used to distinguish fresh and thawed Atlantic salmon. Statistical analysis revealed significant differences in the concentration of some metabolites in reference and frozen-thawed fish during its storage. It was found that salmon freezing/thawing caused a significant increase in the concentration of fumarate and phenylalanine in stored salmon muscle. The concentration of fumarate increased until the 3rd – 5th day after thawing and then gradually decreased, reaching zero after two weeks of storage. The concentration of phenylalanine was constantly increased during the storage time. Furthermore, it was detected that aspartate was formed in the flesh of only thawed fish after the second day of storage. Its concentration followed the same trend as fumarate reaching its maximal concentration on the 3rd – 5th day after thawing (up to 3.8 mg in 100 g of muscle) and gradually decreased to zero. Aspartate formation was influenced by storage time after thawing and not by the time after slaughter. We propose to use the formation of aspartate in stored salmon flesh as a marker of salmon freezing/thawing.

    更新日期:2020-01-17
  • Optimization of espresso coffee extraction through variation of particle sizes, perforated disk height and filter basket aimed at lowering the amount of ground coffee used
    Food Chem. (IF 5.399) Pub Date : 2020-01-16
    Gulzhan Khamitova; Simone Angeloni; Germana Borsetta; Jianbo Xiao; Filippo Maggi; Gianni Sagratini; Sauro Vittori; Giovanni Caprioli

    Espresso machines maintain constant the extraction process of espresso coffee (EC), however, it is difficult to grind roasted coffee in homogeneous way. This research aims to investigate grinded beans at specific particle sizes in three variously designed filter baskets and to compare the concentration of bioactive compounds while decreasing the amount of ground coffee. Analyses on caffeine, trigonelline and chlorogenic acids are carried out with HPLC-VWD, while volatiles with HS-SPME/GC-MS. Extracting with smaller particles escalates the quantity of bioactive compounds. The amount of caffeine/cup increased moving from 500-1000 µm to 200-300 µm particle size, both in Arabica and Robusta for all filter baskets. Keeping constant the volume of EC at various heights of perforated disc, the amount of bioactive compounds at 12 g were only around 9% lower than at 14 g. The outcomes will support further studies on different extraction processes, to develop more sustainable and economically affordable coffee.

    更新日期:2020-01-17
  • Chemical hazards in grapes and wine, climate change and challenges to face
    Food Chem. (IF 5.399) Pub Date : 2020-01-16
    Cristina Ubeda; Ruth Hornedo-Ortega; Ana B. Cerezo; M. Carmen Garcia-Parrilla; Ana M. Troncoso

    Climate change has an impact on the chemical risks associated to wine consumption related with grape development and microbial contamination. We can classify chemical hazards in wine into two groups: those present in grapes due to agricultural practices, environmental contamination or fungal growth and those coming from fermentation and the winemaking process. The first group includes mycotoxins, whilst the second encompasses ethyl carbamate, biogenic amines, sulfur dioxide and proteins used as technological ingredients such as fining material. Usually the effective control of chemical hazards is achieved by assuring that they either are minimized or absent in the final product since their removal is somewhat difficult and sometimes it may affect sensory properties, which is a major issue in wine. Interestingly, it is possible to give recommendations to avoid excess of these compounds, but more research is needed to face future challenges related to climate change and consumer demands.

    更新日期:2020-01-17
  • Hot water pretreatment-induced significant metabolite changes in the sea cucumber Apostichopus japonicus
    Food Chem. (IF 5.399) Pub Date : 2020-01-16
    Peipei Yin; Airong Jia; Kirsten Heimann; Miansong Zhang; Xin Liu; Wei Zhang; Changheng Liu

    Hot water pretreatment of sea cucumbers potentially changes nutritional benefits. This study aimed to quantify hot water pretreatment-induced changes in metabolite profiles of sea cucumber body walls. ICP-OES, GC-MS, and LC-MS analyses of untreated- (UT-BW), hot water-treated body walls (HW-BW) of Apostichopus japonicus, and the hot water extract (HW-E) determined significant losses of minerals (25-50% w/w), protein (∼11% w/w), carbohydrate (33% w/w), saponins (∼41% w/w), and spermidine (100%), a potential antipsychotic from hot water-treated samples. Multivariate comparisons of HW-BW with UT-BW and HW-BW with HW-E showed increases in amino acids and fatty acids, suggesting hot water-induced degradation or transformation or easier extraction of protein, lipid or other components. Presence of 80 to 88.5% of compounds in the HW-E and lower DHA, EPA and glycerophospholipids levels in HW-BW suggested extraction of these metabolites. These data indicate that novel processing technologies are required to preserve the full nutritional benefits of sea cucumbers.

    更新日期:2020-01-17
  • Phytosterols extraction from hickory (Carya cathayensis Sarg.) husk with a green direct citric acid hydrolysis extraction method
    Food Chem. (IF 5.399) Pub Date : 2020-01-16
    Simin Feng; Lei Wang; Tarun Belwal; Li Li; Zisheng Luo

    This study investigated the direct citric acid hydrolysis extraction method to optimize phytosterols extraction from hickory husk. Single factor experiments followed by a three-level three-factor Box-Behnken experiments were performed. The optimal extraction parameters were determined as: pH of 2.0, liquid-to-solid ratio of 17.12: 1 mL/ g, and temperature of 55.81 ℃. Practical experiments were carried out in triplicate, and subsequently yielded phytosterols of 912.452±17.452 μg/g DW, in good consistence with the predicted extraction yield of 902.874 μg/g DW. The conductivity of the extract was also found to play effective role under direct citric acid hydrolysis and recorded 36.30±1.08 μs/cm at optimum extraction condition. β-Sitosterol stigmasterol, campsterol, ergosterol and lupeol were detected as main PSs and triterpenoids in hickory husk using UPLC-Triple-TOF/MS. Finally, the comparison between direct hydrolysis extraction and traditional solvent extraction showed that this new method was more effective and eco-friendlier to extract both free and conjugated phytosterols.

    更新日期:2020-01-17
  • Valorization of olive mill leaves through ultrasound-assisted extraction
    Food Chem. (IF 5.399) Pub Date : 2020-01-16
    María del Mar Contreras; Antonio Lama-Muñoz; Francisco Espínola; Manuel Moya; Inmaculada Romero; Eulogio Castro
    更新日期:2020-01-17
  • Simultaneous determination of cereal monosaccharides, xylo- and arabinoxylo-oligosaccharides and uronic acids using HPAEC-PAD
    Food Chem. (IF 5.399) Pub Date : 2020-01-16
    M. Alyassin; G.M. Campbell; H. Masey O'Neill; M.R. Bedford

    Xylo- and arabinoxylo-oligosaccharides (XOS and AXOS) are of interest for their prebiotic activity. The production of these oligomers might be accompanied with monosaccharides. The measurement of both oligosaccharides and monosaccharides usually requires two methods. The current work presents an HPAEC-PAD method based on gradient elution of aqueous solvents sodium hydroxide and sodium acetate, in contrast to conventional isocratic elution, for the simultaneous separation of 16 standards of monosaccharides, xylo-oligosaccharides, arabinoxylo-oligosaccharides and uronic acids using CarboPac PA 200 column. The presented method showed a stable baseline and high-resolution separation of the standards. The method showed acceptable accuracy and precision. Limits of Detection and Quantitation (LOD and LOQ) were estimated for all the standards. The method was applied to measure the activity of a commercial endoxylanase on wheat bran; a steady release of xylose monosaccharide was observed. Enzyme action on oligosaccharide standards showed a preference for the larger oligosaccharides.

    更新日期:2020-01-17
  • 更新日期:2020-01-17
  • Cooperativity and nonuniformity in the viscosity-change process of rice starch in hot excess water
    Food Hydrocoll. (IF 5.839) Pub Date : 2020-01-17
    Hisashi Yamamoto; Chiaki Amano; Nao Fuchiue; Kanami Ohta
    更新日期:2020-01-17
  • Determination of Free Tryptophan in Beer Samples by Capillary Isotachophoretic Method
    Food Anal. Methods (IF 2.413) Pub Date : 2020-01-17
    Aneta Jastrzębska, Sylwia Kowalska, Edward Szłyk

    Abstract Tryptophan is essential amino acid and precursor for many neurotramsmiters that must be obtained from dietary proteins. However, its free form is easily absorbed and could increase the availability of this amino acid to the brain. Because of free tryptophan interaction with human health simple, eco-friendliness and low-cost method of determination are still needed. In this study, new and simple procedure for free tryptophan determination using capillary isotachophoresis is discussed. The method validation pointed good linearity, satisfactory selectivity, accuracy (recoveries varied from 98.4 to 100.1%), intra- and inter-day precision (coefficent of variation was < 5% for each standard solution and < 6% for real samples) and no matrix effect. The proposed procedure was successfully applied to analyse free tryptophan in beer samples and found contents varied from not detected to 40.74 ± 0.27 mg L−1. The obtained results were compared with chromatographic determination after derivatization with 2-chloro-1,3-dinitro-5-(trifluoromethyl)benzene and pointed better selectivity and accuracy of isotachophoretic procedure with similar precision. Due to the simplicity and flexibility, the proposed procedure is suitable for tryptophan analysis in complex matrices.

    更新日期:2020-01-17
  • Sugarcane Stalk Content Prediction in the Presence of a Solid Impurity Using an Artificial Intelligence Method Focused on Sugar Manufacturing
    Food Anal. Methods (IF 2.413) Pub Date : 2019-06-08
    Wesley Nascimento Guedes, Lucas Janoni dos Santos, Érica Regina Filletti, Fabíola Manhas Verbi Pereira

    For the first time in literature, an analytical method was developed using artificial neural networks (ANNs) combined with color information from digital images to predict the content of sugarcane stalks in the presence of a solid impurity. The data were generated using a laboratory-made simple imaging system and free-access computational routine for the conversion of the images into 10 colors. The ANN model was implemented using 10 neurons in the input layer, 8 neurons in the hidden layer and 1 neuron in the output layer related to the content of sugarcane stalks. The ANN model provided relative errors of 3% and achieved correlation coefficients of 0.98, 0.93, and 0.91 for the training, validation and test sets, respectively. A partial least squares (PLS) model showed the nonlinear nature of the data that implies the application of ANN model. The developed method has the potential to be applied in sugarcane mills as an improvement for the production of high-quality sugar.

    更新日期:2020-01-17
  • FTIR and Chemometrics as Effective Tools in Predicting the Quality of Specialty Coffees
    Food Anal. Methods (IF 2.413) Pub Date : 2019-08-13
    Verônica Belchior, Bruno Gonçalves Botelho, Susana Casal, Leandro S. Oliveira, Adriana S. Franca

    Abstract Cup tasting is the most important tool to access the quality of coffee beans. However, the use of sensory evaluation alone can present some problems, since bias from the previous knowledge of a particular sample and health conditions of the taster can influence the results. Given the well-established potential of spectroscopic methods in coffee quality evaluation, in the present study, we sought to evaluate the potential of FTIR spectroscopy for quantitative evaluation of specialty coffee quality. Samples of specialty coffee were provided by the Federação dos Cafeicultores do Cerrado Mineiro and Fazenda Barinas. They were roasted in IKAWA coffee roaster, analyzed by a group of Q-graders, and submitted to FTIR analysis. Physicochemical analyses (pH, titratable acidity, brix, total solids, and browning compounds) were also employed to show potential differences. Only pH showed significant difference between the beverages. PLS results showed consistent models for predicting the quality previously given by the cuppers, with low values of RMSEC and RMSEP (0.23 both). Also, the models showed high values of Rc (0.99) and Rv (0.97). The whole spectra were considered as important to classify the coffees by their quality, showing the complexity of the beverage.

    更新日期:2020-01-17
  • Comparison of Different Multivariate Classification Methods for the Detection of Adulterations in Grape Nectars by Using Low-Field Nuclear Magnetic Resonance
    Food Anal. Methods (IF 2.413) Pub Date : 2019-06-01
    Carolina Sheng Whei Miaw, Poliana Macedo Santos, Alessandro Rangel Carolino Sales Silva, Aline Gozzi, Nilson César Castanheira Guimarães, Maria Pilar Callao, Itziar Ruisánchez, Marcelo Martins Sena, Scheilla Vitorino Carvalho de Souza

    Grape is the most consumed nectar in Brazil and a relatively expensive beverage. Therefore, it is susceptible to fraud by substitution with other less expensive fruit juices. Adulterations of grape nectars by the addition of apple juice, cashew juice, and mixtures of both were evaluated by using low-field nuclear magnetic resonance (LF-NMR) and supervised multivariate classification methods. Two different approaches were investigated using one-class (only unadulterated samples (UN) were modeled) and multiclass (three classes were modeled: UN, adulterated with cashew (CAS), and adulterated with apple (APP)) strategies. For the one-class approach, soft independent modeling of class analogy (SIMCA), one-class partial least squares (OCPLS), and data-driven SIMCA (DD-SIMCA) models were built. For the multiclass approach, partial least squares discriminant analysis (PLS-DA) and multiclass SIMCA models were built. The results obtained demonstrated good performances by all the one-class methods with efficiency rates higher than 93%. For the multiclass approach, the classification of samples containing only one type of adulterant presented efficiencies higher than 90% and 97% using SIMCA and PLS-DA, respectively. The classification of samples containing blends of two adulterants was satisfactory for the CAS class, but not for the APP class when applying PLS-DA. Nevertheless, multiclass SIMCA did not provide satisfactory predictions for either of these two classes.

    更新日期:2020-01-17
  • Calcium, Fe, Cu, Zn, and Mg Fractionation in In Natura and Aged Beef Samples by Bioanalytical Methods
    Food Anal. Methods (IF 2.413) Pub Date : 2019-06-26
    Rodolfo Carapelli, Aline Fernandes de Oliveira, Rodrigo Giglioti, Rymer Ramiz Tullio, Renata Tieko Nassu, Marcia Cristina Sena Oliveira, Ana Rita Araujo Nogueira

    Abstract Proteins play different and essential roles in the human organism. Containing essential amino acids, proteins, and minerals, beef is considered the main source of protein in human nutrition. It is generally accepted that the protein profile is directly correlated to tenderness and beef pigmentation and is also related to its organoleptic properties. In the present work, it is demonstrated the changes in protein profile, differences of metal concentrations, and how metals bonded to proteins can vary during the ripening phase, evaluated over a 14-day beef aging period. The proposed extraction procedure indicated 85% efficiency, preserving the metal-protein structure. Seventeen protein bands were detected using SDS-PAGE, and a 43-kDa band was found to be the most intense. The arrangement of SDS-PAGE and SEC-ICP-MS results indicated the possible links between minerals and organic functional molecules, such as Ca to troponin, Cu and Zn to albumin, and Fe to myoglobin and hemoglobin.

    更新日期:2020-01-17
  • Direct Analysis of Cocoa Powder, Chocolate Powder, and Powdered Chocolate Drink for Multi-element Determination by Energy Dispersive X-ray Fluorescence Spectrometry
    Food Anal. Methods (IF 2.413) Pub Date : 2019-06-27
    Luciane B. Oliveira, Wagna P. C. dos Santos, Leonardo S. G. Teixeira, Maria Graças A. Korn

    The aim of this study was to evaluate the potential of applying energy dispersive X-ray fluorescence (EDXRF) spectrometry to determine Ca, K, P, Mg, Fe, Zn, Cu, Mn, and Al concentrations for direct analysis of cocoa powder, chocolate powder, and powdered chocolate drink samples. The proposed method was calibrated using samples previously analyzed by inductively coupled plasma optical emission spectrometry (ICP OES). For comparison purposes, the samples were also analyzed by ICP OES after an acid digestion procedure, and no significant differences were observed between the concentrations determined by EDXRF when compared to those by ICP OES. The coefficients of correlation (R) from the calibration curves and the limit of quantification (mg kg−1) were Ca (0.996, 0.030), K (0.985, 68), Mg (0.974, 0.020), P (0.986, 0.50), Mn (0.998, 3.6), Fe (0.981, 2.5), Cu (0.978, 1.3), Zn (0.996, 0.80), and Al (0.983, 7.5). The precisions obtained for the elements were between 1.5 and 7.8% (n = 7), indicating that the preparation of the pellets was efficient to perform analysis by EDXRF. Potassium was the macro-mineral with higher concentrations in the samples. In relation to the micro-minerals, Fe had the greatest concentration. Significant concentrations of Al were also found. It was found that, in general, samples of chocolate powder and powdered chocolate drink may be considered good sources for the ingestion of Mg, Mn, Ca, K, P, Fe, Zn, and Cu.

    更新日期:2020-01-17
  • Development of Method Based on Dispersive Liquid-Liquid Microextraction Air-Assisted for Multi-Element Determination of Cadmium and Manganese in Sugarcane Spirit (Brazilian cachaça ) by FAAS
    Food Anal. Methods (IF 2.413) Pub Date : 2019-07-23
    Adrielle S. Fontes, Julia C. Romero, Leonardo B. Guimarães, Erik G. P. da Silva, Daniel de C. Lima, Fábio Alan C. Amorim

    In this work, a new method was developed for multi-element determination of Cd and Mn in samples of sugarcane spirit (cachaça) by FAAS using the air-assisted dispersive liquid-liquid microextraction (AA-DLLME). After univariate and multivariate optimizations (mixture design), the experimental conditions were as follows: 5.2 mL of sample at pH 8.5, 0.7 mL 10% (w/v) NaCl solution, 120 μL of trichlorethylene (extraction solvent) containing 1-(2-pyridylazo)-2-naphthol (PAN) at 0.05% (w/v) as chelating agent, six cycles of stirring the mixture with a glass syringe, and 3 min of centrifugation. In these conditions, the calibration curve obtained for Cd was Abs = 0.0158CCd + 0.0333, with R2 0.9951 and for Mn was Abs = 0.0011CMn + 0.0142 and R2 0.9911. The limits of detection, enrichment factor, and consumption index were, respectively, 0.51 μg L−1, 79 and 0.07 mL for Cd, and 1.64 μg L−1, 18, and 0.28 mL for Mn. Precision was evaluated at concentrations of 5 and 10 μg L−1, and RSD% (N = 10) was 0.97% and 6.6% for Cd and 2.8% and 4.5% for Mn, respectively. Addition and recovery tests in samples of Brazilian cachaça were performed to evaluate the accuracy, and recoveries were 87% to 120%, with concentrations found between 1.20 and 3.05 μg L−1 for Cd and between 6.98 and 14.4 μg L−1 for Mn. The developed method proved to be sensitive, efficient, simple, fast, and having low reagent consumption, and of applicability not previously reported in the literature.

    更新日期:2020-01-17
  • Sequential Determination of Cd, Co, Cu, Fe, Mg, Mn, Ni, Pb, and Zn in Powdered Refreshments by FS-F AAS After a Simple Sample Treatment
    Food Anal. Methods (IF 2.413) Pub Date : 2019-07-17
    Joelem Carvalho Melo, Wellington Correia Carvalho, Elane S. Boa Morte, Rennan Geovanny O. Araujo, Daniele Cristina M. B. Santos

    In this work, a procedure is proposed for the direct analysis of powdered refreshments by fast sequential flame atomic absorption spectrometry (FS-F AAS), after a simple treatment of the sample. A full 23 factorial design was applied, and the variables chosen were as follows: acid concentration, acid type, and sonication time. Optimization provided the best conditions considering a mass of powdered refreshment of about 0.18 g diluted to a final volume of 15 mL with 0.5 mol L−1 HCl. The matrix effect was investigated, and external calibration was feasible for the determination of Cd, Co, Cu, Fe, Mg, Mn, Ni, Pb, and Zn. The limit of quantification (LoQ) obtained was between 0.6 (Cd) and 25 mg kg−1 (Pb). The analyte addition and recovery test were applied to evaluate the accuracy, and recovery percentage values ranging from 83.9 to 109.7% were obtained, which is considered adequate for quantitative analysis. Precision was expressed as relative standard deviation (% RSD); it was less than or equal to 5.0% (n = 7) for all analytes. The procedure was applied to 21 samples of powdered refreshment commercialized in Salvador (Brazil) and Buenos Aires (Argentina). The concentration range and average of the analytes in the samples (in mg kg−1) commercialized in Brazil (BZ) and Argentina (AG) were as follows: Co (BZ < 6.4–9.94, average 8.85; AG < 6.4–10.3, average 9.92), Fe (BZ < 6.9–376, average 270; AG < 6.9–32.81, average 29.11), Mg (BZ < 8.9–363, average 140; AG 770–3139, average 1464), Mn (BZ < 3.2–4.88, average 4.24; AG < 6.9), and Zn (BZ < 1.4–1.68, average 1.68; AG < 1.4). The concentrations of Cd, Cu, Ni, and Pb were lower than the LoQ of the proposed analytical method. For refreshment samples commercialized in Buenos Aires (Argentina), high concentrations of Mg were found in their chemical composition, but Mg had been used as anti-caking agent along with the other components.

    更新日期:2020-01-17
  • Simultaneous Determination of Chromium and Iron in Powdered Milk Using High-Resolution Continuum Source Graphite Furnace Atomic Absorption Spectrometry
    Food Anal. Methods (IF 2.413) Pub Date : 2019-08-30
    Adilson S. Santos, Cheilane T. de Souza, Danilo J. Leao, Felipo O. Correia, Tarcísio S. Almeida, Sergio L. C. Ferreira

    Abstract This work proposes the simultaneous determination of chromium and iron in powdered milk samples using high-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GF AAS) and sample digestion in microwave oven using nitric acid and hydrogen peroxide. The method was established using the primary line (357.869 nm) for chromium and the adjacent secondary line (358.120 nm) for iron while employing aluminum as the chemical modifier. The absorbance signals were measured by peak area using three pixels for both elements. Chromium and iron can be determined in powdered milk samples by the external calibration technique with limits of quantification of 28 ng g−1 for chromium and 19 μg g−1 for iron. The precision was evaluated by using a milk sample with chromium and iron concentrations of 0.76 μg g−1 and 151.3 μg g−1, respectively. The results expressed as relative standard deviation (n = 10) were 2.6% for iron and 3.9% for chromium. The method accuracy was confirmed by the analysis of a milk sample by a comparison of results obtained by the proposed method and those found by employing inductively coupled plasma mass spectrometry (ICP-MS). Five samples were analyzed, and the analyte concentrations found varied from 408 to 805 ng g−1 for chromium. Among the five samples, three had an iron concentration lower than 19 μg g−1 and in the other two samples, the iron concentrations varied from 151 to 199 μg g−1.

    更新日期:2020-01-17
  • Lab-On-A-Chip Extraction of Phenolic Compounds from Extra Virgin Olive Oil
    Food Anal. Methods (IF 2.413) Pub Date : 2019-04-08
    Kenia Chávez Ramos, Luis Fernando Olguín Contreras, María del Pilar Cañizares Macías

    Abstract A novel liquid–liquid extraction method of phenolic compounds from extra virgin olive using microfluidic technique was developed. The microdevice of polydimethylsiloxane (PDMS) was designed in two parts; the first one to carry out the extraction of polyphenols using only an alkaline aqueous solution and the second one to develop the reaction product using Folin–Ciocalteu reagent, which was measured at 730 nm at the microchip exit. Hydrodynamic and chemical parameters, such as flowrates of extraction and reaction, length of microchannels, extraction pH, extraction buffer concentration, and concentration of Folin–Ciocalteu reagent, were evaluated. Although all parameters were important, the results showed that pH, carbonate buffer concentration, and the Folin–Ciocalteu reagent concentration were significant factors and that the increase in the length of the extraction coil enhanced the extraction percentage. The results showed higher extraction efficiency by the microfluidic method, between 46 and 67%, than for the other two batch extraction methods.

    更新日期:2020-01-17
  • A Green Analytical Method for the Multielemental Determination of Halogens and Sulfur in Pet Food
    Food Anal. Methods (IF 2.413) Pub Date : 2019-06-08
    Julia Eisenhardt de Mello, Diogo La Rosa Novo, Gilberto Silva Coelho Junior, Priscila Tessmer Scaglioni, Marcia Foster Mesko

    A suitable and green analytical method using microwave-induced combustion and ion chromatography with conductivity detection (IC-CD) and mass spectrometry detection (IC-MS) was proposed for the halogens and sulfur determination in pet food using a single analysis. Samples (up to 500 mg) were efficiently digested in a closed system under oxygen pressure (20 bar). Ultrapure water and 50 mmol L−1 or 100 mmol L−1 (NH4)2CO3 were evaluated as absorbing solutions. Trueness was evaluated by recovery tests using standard solution and certified reference materials. In both tests, mean recoveries ranging from 91 to 108% for all analytes were obtained using 50 mmol L−1 (NH4)2CO3 as absorbing solution. AOAC International recommended official methods for Cl and F determination in animal feed were also performed. Results for Cl using proposed method were in agreement with those obtained using AOAC official method, while the results for F were not compared between them because the concentration in the samples using AOAC official method was not detected. Precision was evaluated in terms of repeatability and the relative standard deviations (RSDs) using the proposed method were always lower than 8%. The proposed method presents several advantages when compared with AOAC International official methods such as the multielemental determination capability, lower waste generation, lower limits of detection, lower RSDs, and higher sample throughput. Sixteen samples destined to cats or dogs from different manufacturers were analyzed and the results showed a wide variation. These results indicate that an efficient quality control should be performed, and the proposed method is an excellent alternative as a new analytical tool for routine analysis of pet food.

    更新日期:2020-01-17
  • Chemometric Approach Using ComDim and PLS-DA for Discrimination and Classification of Commercial Yerba Mate ( Ilex paraguariensis St. Hil.)
    Food Anal. Methods (IF 2.413) Pub Date : 2019-05-22
    Tatiane Francielli Vieira, Gustavo Yasuo Figueiredo Makimori, Maria Brígida dos Santos Scholz, Acácio Antonio Ferreira Zielinski, Evandro Bona

    Abstract Yerba mate samples from three different states of Brazil were evaluated in order to discriminate them regarding the presence of sugar and geographic origin. High-performance liquid chromatography (HPLC), phytochemical compounds, in vitro antioxidant activity, visible and near-infrared (NIR) spectroscopy, colorimetry, and electronic nose were used in tandem with chemometric methods. The multiblock exploratory analysis (ComDim) was able to discriminate the samples containing sugar; however, it was not possible to discriminate them by geographical origin. Furthermore, ComDim results showed the NIR spectra presented the best discriminating capacity. Partial least square discriminant analysis (PLS-DA) models constructed using NIR spectra classified the samples assertively according to the presence of sugar (100% of sensitivity and specificity for the prediction set), and reasonable models were also obtained for the geographic classification (80% of sensitivity and 93% of specificity for the prediction set). The multiblock approach allowed an overall evaluation of the data collected through different analytical methods. In addition, among the methods applied, NIR spectroscopy was faster and cheaper and allowed for better sample discrimination.

    更新日期:2020-01-17
  • Assessment of Brazilian Monovarietal Olive Oil in Two Different Package Systems by Using Data Fusion and Chemometrics
    Food Anal. Methods (IF 2.413) Pub Date : 2019-05-22
    Thays R. Gonçalves, Larissa N. Rosa, Alex S. Torquato, Luiz F. O. da Silva, Paulo H. Março, Sandra T. Marques Gomes, Makoto Matsushita, Patrícia Valderrama

    Abstract The olive oil consumption has spread worldwide, increasing the necessity of quality assessment, and so forth, the search for new, alternative, and rapid data interpretation has started, boosting the interest and the use of data fusion that seek for an integration of results from different techniques or methodologies for the same data set. To better understand the storage effects on the Brazilian monovarietal extra virgin olive oil, data fusion was applied in the classical and alternative analysis, highlighting the similarities and differences between the techniques, assisting in the result interpretation. This perspective and strategy bring development to food chemistry analysis.

    更新日期:2020-01-17
  • Development of an accurate and reliable DNA method for botanical origin authentication of ginseng food products
    J. Food Compos. Anal. (IF 2.994) Pub Date : 2020-01-17
    Xiaoran Tian; Shixin Lv; Huili Tian; Rongbo Wang; Hongtao Wang

    Panax ginseng and Panax quinquefolius are two of the most commonly used Panax species with similar morphology but different pharmacological effects. These two species may be substituted for each other due to commercial interest or misidentification caused by similarity in appearance. Therefore, botanical origin authentication of ginseng food products is of great importance for their origin authenticity control and food safety. However, DNA degradation is the chief obstacle to marker-based origin authentication of ginseng products. In this study, indel markers were exploited from introns of 6 ginseng contigs by using an intron-flanking strategy. Specific primers were respectively designed for Panax ginseng and P. quinquefolius based on their insertion sequences in mitochondrial cytochrome c oxidase subunit II (cox2) gene. The developed multiplex PCR assay, mitigating the deficiency of DNA degradation, was proved to be effective for botanical origin authentication of ginseng food products. Furthermore, the assay can detect 0.1% of intentional adulteration of P. quinquefolius into P. ginseng down to 0.001 ng of genomic DNA and vice versa. This study provides an accurate and reliable DNA method for botanical origin authentication of ginseng food products, and the presented method can be employed in origin authentication of other herbal preparations.

    更新日期:2020-01-17
  • Determination of Chromium Picolinate and Trace Hexavalent Chromium in Multivitamins and Supplements by HPLC-ICP-QQQ-MS
    J. Food Compos. Anal. (IF 2.994) Pub Date : 2020-01-16
    Ovidiu Mihai; Mayumi S. Kawamoto; Kelly L. LeBlanc; Patricia Grinberg; Ana Rita de Araújo Nogueira; Zoltán Mester

    Chromium picolinate (CrPic) and trace hexavalent chromium (Cr(VI)) content were characterized in VITA-1 and VITB-1, two new multivitamin and mineral supplement candidate reference materials from National Research Council Canada, by two methods of high performance liquid chromatography inductively-coupled plasma triple quadrupole mass spectrometry. The conditions for the separation of Cr(VI) from EDTA-complexed Cr(III) were optimized such that species interconversions were not observed during analysis. Following extraction with dilute NH4OH in water at pH 10 (for Cr(VI)) or 3:2 acetonitrile:water (for CrPic) and quantification by standard addition, it was concluded that CrPic accounted for 95-96% of the Cr in VITA-1 and VITB-1, while Cr(VI) was not present above the detection limit of 0.13 µg Cr g-1. Using the two developed methodologies, commercially-available nutritional supplements, in the form of vitamin tablets and dried food supplements, were assessed, and it was determined that CrPic accounted for the majority (92%-98%) of the chromium present in the tablets, and that Cr(VI) concentrations were below the detection limit for all samples except for the powdered beets where it accounted for nearly half of the total Cr present.

    更新日期:2020-01-17
  • Metabolic profiling of organic acids in honey by stable isotope labeling assisted liquid chromatography-mass spectrometry
    J. Food Compos. Anal. (IF 2.994) Pub Date : 2020-01-16
    Na An; Wen-Jing Cai; Quan-Fei Zhu; Wei Wang; Dilshad Hussain; Yu-Qi Feng
    更新日期:2020-01-17
  • Drivers for the implementation of market‐based food safety management systems: Evidence from Lebanon
    Food Sci. Nutr. (IF 1.747) Pub Date : 2020-01-17
    Gumataw Kifle Abebe; Rachel Anne Bahn; Ali Chalak; Abed Al Kareem Yehya
    更新日期:2020-01-17
  • Anacardic acid mitigates liver fat accumulation and impaired glucose tolerance in mice fed a high‐fat and high‐sucrose diet
    Food Sci. Nutr. (IF 1.747) Pub Date : 2020-01-17
    Sangwon Chung; Eun Ju Shin; Hyo‐Kyoung Choi; Jae Ho Park; Jin‐Taek Hwang
    更新日期:2020-01-17
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  • Quantitative Comparative Integrated Proteomic and Phosphoproteomic Analysis of Chicken Egg Yolk Proteins under Diverse Storage Temperatures
    J. Agric. Food Chem. (IF 3.571) Pub Date : 2020-01-16
    Hong Wang; Ning Qiu; Yoshinori Mine; Haohao Sun; Yaqi Meng; Li Bin; Russell Keast
    更新日期:2020-01-17
  • Harnessing yeast peroxisomes and cytosol acetyl-CoA for sesquiterpene α-humulene production
    J. Agric. Food Chem. (IF 3.571) Pub Date : 2020-01-16
    Chuanbo Zhang; Man Li; Guang-Rong Zhao; Wenyu Lu

    Metabolic engineering of Saccharomyces cerevisiae focusing on the cytoplasm for sustainable terpenoid production is commonly practiced. However, engineering organelles for terpenoid production is rarely reported. Herein, peroxisomes, together with the cytoplasm, were engineered to boost sesquiterpene α-humulene synthesis in S. cerevisiae. The farnesyl diphosphate (FPP) synthetic pathway and α-humulene synthase were successfully expressed inside yeast peroxisomes to enable high-level α-humulene production with glucose as the sole carbon source. By combining peroxisomal and cytoplasmic engineering, α-humulene production was increased by 2.5-fold compared to that in cytoplasm-engineered recombinant strains. Finally, the α-humulene titer of 1726.78 mg/L was achieved by fed-batch fermentation in a 5-L bioreactor. The strategy presented here offers an efficient method for terpenoids production in S. cerevisiae.

    更新日期:2020-01-17
  • Assessment of Test Portion Sizes after Sample Comminution with Liquid Nitrogen in an Improved High-Throughput Method for Analysis of Pesticide Residues in Fruits and Vegetables
    J. Agric. Food Chem. (IF 3.571) Pub Date : 2020-01-16
    Steven J. Lehotay; Nicolás Michlig; Alan R. Lightfield

    In this study, sample processing of bulk commodities using an efficient one-step comminution procedure with liquid nitrogen (LN2) was devised and assessed in the analysis of pesticide residues in fruits and vegetables. The LN2 was added to the fresh samples from a tank by opening a valve, and the standard food chopper was kept in a laboratory hood to reduce safety risks. Test portions of 4 replicates each of 0.25, 0.5, 1, 2, 5, 10, and 15 g were taken from 8 fruits and vegetables (tomato, squash, broccoli, apple, grape, peach, green bean, and cucumber) individually comminuted with LN2. For comparison without comminution, similar test portions of a reconstituted freeze-fried certified reference material of pesticides in cucumber were also analyzed by the same method. More than 100 pesticides were monitored by both ultrahigh-performance liquid chromatography – tandem mass spectrometry (UHPLC-MS/MS) and instrument-top sample preparation (ITSP) + fast low-pressure gas chromatography (LPGC)-MS/MS. A new version of QuEChERS-based sample preparation was followed in which 5 mL 4/1 (v/v) acetonitrile/water per g sample is used for extraction, 200 μL initial extract is quickly evaporated, reconstituted in water, and ultra-centrifuged for UHPLC-MS/MS analysis. For ITSP+LPGC-MS/MS, another portion of the initial extract undergoes salt-out partitioning with 4/1 (w/w) anh. MgSO4/NaCl and the upper layer extract is transferred to an autosampler vial for automated cleanup and analysis in parallel. Quality control spikes were made during the comminution, extraction, cleanup, and analyses steps to isolate and estimate the individual and overall measurement uncertainties of the approach. Recommended test portion size is 2 g for routine monitoring by this approach, but results demonstrated that subsamples as low as 0.5 g typically gave overall biases and RSDs <10% for nearly all pesticides, commodities, and methods, which is 3-5% lower than previously evaluated sample processing and analytical methods. This approach can be used to improve data quality, laboratory efficiency, and sample throughput in routine monitoring programs for regulatory, risk assessment, and other purposes.

    更新日期:2020-01-17
  • Effects of processing and storage conditions on the stability of sweet potato (Ipomoea batatas L.) leaf flavonoids
    Int. J. Food Sci. Tech. (IF 2.281) Pub Date : 2020-01-15
    Jiang Liu; Taihua Mu; Hongnan Sun; Marie Laure Fauconnier
    更新日期:2020-01-16
  • Differentiated Hepatic Response to Fructose Intake during Adolescence Reveals the Increased Susceptibility to Non‐Alcoholic Fatty Liver Disease of Maternal High‐Fat Diet Male Rat Offspring
    Mol. Nutr. Food Res. (IF 4.653) Pub Date : 2020-01-16
    Lorraine S. Oliveira; Bruna Caetano; Rosiane A. Miranda; Aline F. P. Souza; Aline Cordeiro; Juliana Woyames; Cherley B. V. Andrade; Georgia C. Atella; Christina M. Takiya; Rodrigo S. Fortunato; Isis H. Trevenzoli; Luana L. Souza; Carmen C. Pazos‐Moura
    更新日期:2020-01-16
  • Flavonoid‐Derived Human Phenyl‐γ‐Valerolactone Metabolites Selectively Detoxify Amyloid‐β Oligomers and Prevent Memory Impairment in a Mouse Model of Alzheimer's Disease
    Mol. Nutr. Food Res. (IF 4.653) Pub Date : 2020-01-16
    Roberta Ruotolo; Ilaria Minato; Pietro La Vitola; Luisa Artioli; Claudio Curti; Valentina Franceschi; Nicoletta Brindani; Davide Amidani; Laura Colombo; Mario Salmona; Gianluigi Forloni; Gaetano Donofrio; Claudia Balducci; Daniele Del Rio; Simone Ottonello
    更新日期:2020-01-16
  • Advances in antimicrobial peptides-based biosensing methods for detection of foodborne pathogens: A review
    Food Control (IF 4.248) Pub Date : 2020-01-16
    Zhaohui Qiao; Yingchun Fu; Chunyang Lei; Yanbin Li

    Foodborne diseases caused by pathogens are great threats to human health. Rapid detection of foodborne pathogens at an early stage is imperative for preventing the outbreak of diseases. The identification and detection of foodborne pathogens by biosensors have attracted great attention due to their high sensitivity, nearly real-time quantification without enrichment and the possibility of on-site detection with easy-to-use format. As a promising alternative recognition element of biosensors, antimicrobial peptides (AMPs) with high stability and low cost have been widely studied in the detection of bacteria. In this review, we retrospect the advances on AMPs-based detection methods for foodborne pathogens including electrochemical, optical and piezoelectric methods as well as their integrations with nanomaterials. Considering the important roles of AMPs affinity in detection, the factors influencing AMPs affinity are introduced before the review of various AMPs-based methods. In addition, as a new promising technology, the microfluidics has been integrated with AMPs-based methods to detect foodborne pathogens. Finally, future perspectives and challenges in developing reliable and sensitive AMPs-based platforms are discussed.

    更新日期:2020-01-16
  • Effect of partial replacement of polyphosphate with alkaline electrolyzed water (AEW) on the quality of catfish fillets
    Food Control (IF 4.248) Pub Date : 2020-01-16
    Hui-Min Lin; Yen-Con Hung; Shang-Gui Deng

    Effect of partial replacement of polyphosphate (50%) with alkaline electrolyzed water (AEW) on the water retention capacity, color, textural properties and lipid oxidation of catfish fillets was investigated. Catfish fillet samples were divided into five soaking group: Group 1 (AEW: pH=11.6), Group 2 (EOA: AEW with 1.25g/L sodium tri-polyphosphate, 0.3g/L sodium metapolyphosphate, 0.4g/L sodium polyphosphate , pH=11.4), Group 3 (NEO: water with 2.5 g/L sodium tri-polyphosphate, 0.6g/L sodium metapolyphosphate, 0.8g/L sodium polyphosphate, pH=9.0), Group 4 (WAT: tap water) and Group 5 (NOT: no soaking treatment). The results showed that AEW and EOA can improve catfish fillets weight gain and enhance water retention capacity similar to the phosphate enhancement treatment (NEO), but had no effect on product L* value and hardness and elasticity. For the total color difference (ΔE) and oxidation resistance, EOA treatment was better than AEW and NEO. Therefore, AEW alone or AEW with phosphate used in the traditional phosphate enhancement solutions can be used to enhance the quality of catfish fillets.

    更新日期:2020-01-16
  • In-line and non-destructive monitoring of core temperature in sausages during industrial heat treatment by NIR interaction spectroscopy
    J. Food Eng. (IF 3.625) Pub Date : 2020-01-16
    Jens Petter Wold; Marion O'Farrell; Jon Tschudi; Carl Emil Eskildsen; Petter Vejle Andersen; Silje Ottestad

    During industrial heat treatment of food products, the core temperature is a critical control parameter with respect to food quality and in particular food safety. This paper presents a novel prototype system based on near-infrared spectroscopy (NIRS) that enables continuous in-line and non-contact monitoring of core temperature in sausages during heat treatment in an industrial oven. NIRS interaction measurements in the 761–1081 nm region were used to probe the interior of the sausages. NIRS calibrations for the estimation of core temperature were developed for three different sausage types in the temperature range 60–90 °C. The best accuracy obtained for core temperature with NIRS was about ±1.0 °C. Results indicate that calibrations for core temperature can be transferred between different sausage types, which will ease implementation of such a method. The method was successfully tested in a modern sausage production plant.

    更新日期:2020-01-16
  • Physical properties and storage stability of reverse osmosis skim milk concentrates: effects of skim milk pasteurisation, solid content and thermal treatment
    J. Food Eng. (IF 3.625) Pub Date : 2020-01-16
    Morten Vormsborg Christiansen; Troels Bjerregaard Pedersen; Jesper Nagstrup Brønd; Leif H. Skibsted; Lilia Ahrné

    Concentrated dairy products are of increasing interest within the dairy industry. Skim milk concentrates can be produced by reverse osmosis membrane filtration, which can be considered a non-thermal process. Therefore, the physical properties of concentrates differ from the properties of concentrates produced by evaporation. In this study, reverse osmosis filtration of raw and pasteurised skim milk was carried out in batch up to 28% total solids content and the effect of thermal treatment (65-110 °C, 15 seconds) and storage at 5 °C up to ten days on rheological and physical properties of concentrates, were evaluated. Concentrates produced from pasteurised skim milk required longer concentration times and showed larger average casein micelle sizes, but limited structure build-up capability during storage compared to concentrates produced from raw milk which more readily created structural networks between the milk constituents and consequently had higher viscosity. Thermal treatment of concentrates increased their average particle size and viscosity, an effect enhanced by increasing the total solids content. Concentrates produced from non-pasteurised milk showed the strongest shear-thinning behaviour during storage. Thus, the thermal treatment of milk before or after the concentration process, controls the structure formation of skim milk concentrates during storage.

    更新日期:2020-01-16
  • Morphological, thermal and mechanical properties of polyamide and ethylene vinyl alcohol copolymer multilayer flexible packaging after high-pressure processing
    J. Food Eng. (IF 3.625) Pub Date : 2020-01-16
    Luís Marangoni Júnior; Léa Mariza de Oliveira; Paula Fernanda Janetti Bócoli; Marcelo Cristianini; Marisa Padula; Carlos Alberto Rodrigues Anjos

    The effect of high-pressure processing on the morphological surface, thermal and mechanical properties of three PA and EVOH based multilayer flexible packaging materials were evaluated. LDPE/PA/LDPE, LDPE/EVOH/LDPE and PET/LDPE/PA/EVOH/PA/LDPE packaging samples were processed under three different conditions (600 MPa/25 °C/10 min, 600 MPa/90 °C/10 min and 0.1 MPa/90 °C/10 min) and an unprocessed sample was used as control. The LDPE/PA/LDPE and LDPE/EVOH/LDPE samples showed good thermal stability and no surface defects after processing, because of the greater thickness of the external material, the film withstood the compression and decompression of the processing, consequently resulting in the protection of the other layers. The PET/LDPE/PA/EVOH/PA/LDPE sample showed a significant increase in the Tm of PET, LDPE and PA after processing at 600 MPa/90 °C/10 min. Regarding the mechanical properties, reductions in the tensile strength of the PET/LDPE/PA/EVOH/PA/LDPE sample were observed after processing at 600 MPa/90 °C/10 min. In addition, a significant reduction in heat seal strength was observed in the three materials after processing at 600 MPa, but these values are accepted in practice. Therefore, in terms of morphological, thermal and mechanical properties, LDPE/PA/LDPE and LDPE/EVOH/LDPE materials are recommended for the processing conditions of this study, whereas PET/LDPE/PA/EVOH/LDPE materials require further evaluation of other functional properties.

    更新日期:2020-01-16
  • Development of TPGS/F127/F68 mixed polymeric micelles: Enhanced oral bioavailability and hepatoprotection of syringic acid against carbon tetrachloride-induced hepatotoxicity
    Food Chem. Toxicol. (IF 3.775) Pub Date : 2020-01-16
    Congyong Sun; Wenjing Li; Ping Ma; Yang Li; Yuan Zhu; Huiyun Zhang; Michael Adu-Frimpong; Wenwen Deng; Jiangnan Yu; Ximing Xu
    更新日期:2020-01-16
  • Characterization of Lactococcus strains isolated from artisanal Oaxaca cheese
    LWT - Food Sci. Technol. (IF 3.714) Pub Date : 2020-01-16
    I. Caro; E.J. Quinto; L. Fuentes; V. Alessandria; L.S. Cocolin; M.P. Redondo-del-Río; B. Mayo; A.B. Flórez; J. Mateo

    Lactococci strains obtained from raw-milk Oaxaca cheese through its production process in two factories from the Tulancingo Valley, Mexico, were isolated and characterized. A total of 120 colonies were selected from the growth in M17 and MRS agars. Twenty were identified as lactococci strains, all Lactococcus lactis, and were characterized by molecular and phenotypic methods including carbohydrate use, enzymatic profile, acidifying capacity, and antibiotic and phage resistance. High phenotypic diversity was observed and confirmed among the Lactococcus lactis strains by rep-PCR fingerprints. Fifty percent of the strains were resistant to streptomycin and 35% to erythromycin. Nine isolates were considered as fast acidifying strains. The predominant volatile compounds produced were 3-methylbutanol, 3-methylbutanal and butane-2,3-dione. A selection of strains isolated in this study has shown satisfactory characteristics to be used as potential starters for the industrial production of Oaxaca cheese.

    更新日期:2020-01-16
  • 更新日期:2020-01-16
  • 更新日期:2020-01-16
  • Rapid and Sensitive Detection of Isoproturon Via an Electrochemical Sensor Based on Highly Water-Dispersed Carbon Hybrid Material
    Food Anal. Methods (IF 2.413) Pub Date : 2020-01-16
    Ying Zhou, Fuliang Cheng, Yanping Hong, Jianping Huang, Xue Zhang, Xiaoning Liao

    Isoproturon (ISO), an herbicide belonging to the phenyl urea family, is extensively used in modern agriculture to guarantee a bumper harvest. However, it has been evidenced that the ISO has heavy toxicity to the liver system and appears to be a tumor promoter. It is therefore urgent to develop sensitive and selective methods to screen its presence in food resources to meet the ever-increasing pollution restrictions. In this work, an electrochemical sensor based on graphene oxide–modified multi-walled carbon nanotubes hybrid material was firstly developed for the rapid and sensitive detection of ISO via square wave voltammetry (SWV). Under optimized experimental conditions, the sensor exhibits a relatively wide linear range from 0.30 to 15.0 μmol L−1, a low limit of detection (LOD) of 0.10 μmol L−1, as well as good repeatability, high reproducibility, excellent selectivity, and long-term stability. The sensor has also been successfully employed in various real samples such as rice field water, tomato, and lettuce analyses. The obtained recoveries are in the range of 97.33–105.0% with low relative standard deviation (less than 2.5%), which is very close to the results of the high-performance liquid chromatography (HPLC), showing the proposed electrochemical sensor has great potential in practical applications.

    更新日期:2020-01-16
  • Determination of 10-hydroxy-2-decenoic acid and free amino acids in royal jelly supplements with purpose-made capillary electrophoresis coupled with contactless conductivity detection
    J. Food Compos. Anal. (IF 2.994) Pub Date : 2020-01-16
    Hong Anh Duong; Minh Tuan Vu; Thanh Dam Nguyen; Manh Huy Nguyen; Thanh Duc Mai

    This study reported a simple and inexpensive method for determination of 10-hydroxy-2-decenoic acid (10-HDA) and free amino acids in different royal jelly based dietary supplement samples using a purpose-made dual-channeled capillary electrophoresis (CE) system with capacitively coupled contactless conductivity detection (C4D). The objective of the work is to propose a tool for food / quality control activities that can be realizable even with a modest infrastructure. 10-HDA and free amino acids were analyzed using the background electrolyte (BGE) solutions composed of 20 mM Tris(hydroxymethyl)aminomethane adjusted to pH8.5 with acetic acid and of 2 M lactic acid, respectively. The best achieved detection limit for 10-HDA was 0.039 mg/g and those for free amino acids were in ranged of 0.039 - 0.090 mg/g using the developed CE-C4D methods. Good agreement between results obtained from CE-C4D and those with the standard confirmation methods (HPLC-PDA) was achieved, with the result deviation for the two pairs of data being less than 5 % for 10-HDA and 16% for free amino acids.

    更新日期:2020-01-16
  • Application of QuEChERS-EMR-Lipid-DLLME method for the determination of polycyclic aromatic hydrocarbons in smoked food of animal origin
    J. Food Compos. Anal. (IF 2.994) Pub Date : 2020-01-16
    Tereza Slámová; Anna Sadowska-Rociek; Adéla Fraňková; Magdalena Surma; Jan Banout

    The aim of this study was to develop an effective sample preparation procedure for the determination of polycyclic aromatic hydrocarbons (PAHs) in smoked fatty products of animal origin (fish, cheese and sausage). Two different approaches were tested: classical QuEChERS and procedure with the use of Enhanced Matrix Removal (EMR)-Lipid material. Two techniques of extract preconcentration: under nitrogen stream and with the use of dispersive liquid-liquid microextraction (DLLME), were also taken into consideration. All samples were analysed using gas chromatography-mass spectrometry. The results showed the optimised sample preparation procedure was composed of three steps: 1) QuEChERS extraction, 2) clean-up by EMR-Lipid material and 3) extract preconcentration by DLLME. The obtained recovery rates within the range of 50-120% were received for all compounds with relative standard deviation (RSD) values lower than 16.7%. The proposed method is fast and effective and can be successfully applied for PAHs determination in difficult matrices such as heat-treated food of animal origin with high fat content. The research also discovered the significance of the quality of the laboratory disposables. Contaminants present in plastic consumables can be transferred to the sample extract contributing to its contamination and can also lead to failure of analytical equipment.

    更新日期:2020-01-16
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