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  • Enrichment of meat emulsion with mushroom (Agaricus bisporus) powder: Impact on rheological and structural characteristics
    J. Food Eng. (IF 3.099) Pub Date : 2018-05-26
    Abdullah Kurt, Hüseyin Gençcelep

    Mushrooms are considered to be a next-generation health food due to their rich protein content with high biological value, fiber and bioactive compounds. Utilization of the protein and fiber contents of mushroom for the production of functional meat products with better emulsion characteristics was the aim of this study. Therefore, the influence of mushroom powder (MP) addition (0-3%) on the properties of a model meat emulsion was investigated. Dynamic and creep-recovery analyses were conducted to reveal the effect of MP on emulsion stability by evaluating internal structure variations. Samples with 2% MP added exhibited higher resistance to applied stress and higher gel-like behavior, complex viscosity, pseudoplastic behavior, heat resistance and emulsion strength compared with other samples. Modifications of the chemical structure of emulsions with MP included were confirmed by examination of Fourier-transform infrared spectra. The addition of 2% MP provided a higher protein adsorption at the lipid interface, resulting in a well-ordered emulsion structure. As a final product, cooked meat emulsion exhibited improvement in textural properties with the addition of 2% MP. Therefore, supplementation of emulsions with mushroom powder may help to obtain a functional product with better characteristics.

    更新日期:2018-05-27
  • Development of a non-destructive detection system of Deep Pectoral Myopathy in poultry by dielectric spectroscopy
    J. Food Eng. (IF 3.099) Pub Date : 2018-05-26
    Maria Victoria Traffano-Schiffo, Marta Castro-Giraldez, Vicente Herrero, Ricardo J. Colom, Pedro J. Fito

    The trend in meat consumption has changed drastically in the last years, mainly due to the relationship of red and processed meats with cancer and cardiovascular diseases, which has caused a substantial growth in poultry meat consumption, 8% in 2016. Therefore, poultry production has suffered an intensification that has led to an increase in the incidence of internal malformations in chickens and turkeys for fattening, especially in the pectoral muscles, as Deep Pectoral Myopathy (DPM). Currently, industry is not able to detect DPM breasts when sold as whole carcasses. In this context, the use of dielectric spectroscopy, complemented by a deep study of the chemical, biochemical and microstructural transformations of the muscle and the effect that these changes have on the electrical dispersions in radiofrequency range, may become feasible for online DPM detection. For this paper, non-damaged and affected by DPM chicken breasts (pectoralis major and pectoralis minor) was analysed. Permittivity in radiofrequency and microwave ranges were measured in the different tissues: pectoralis minor, major and skin in order to characterize them. Moreover, proteins content, ion content and pH were measured. With this data, a sensor for measuring the permittivity of chicken whole carcass with skin was developed; it consists of two pairs of two flat plates sensor connected to an impedance Agilent analyzer 4294A and can measure the permittivity from 40 Hz to 1 MHz. The results demonstrated the feasibility of the permittivity in radiofrequency range as an potential identification technique of chicken breasts affected by DPM.

    更新日期:2018-05-27
  • Impact of prepubertal exposure to dietary protocatechuic acid on the hypothalamus-pituitary-testicular axis in rats
    Chem. Biol. Interact. (IF 3.143) Pub Date : 2018-05-26
    Isaac A. Adedara, Olubunmi Omole, Edozie S. Okpara, Opeyemi B. Fasina, Modupe F. Ayeni, Olamide M. Ajayi, Esther O. Busari, Ebenezer O. Farombi

    Protocatechuic acid (PCA; 3, 4-dihydroxybenzoic acid) is a phenolic compound widely found in many edible fruits, vegetables, grape wine and plant-derived beverages. The present study investigated the impact of PCA on the hypothalamus-pituitary-testicular axis of rats orally treated with PCA during the period of prepubertal development to adulthood. Protocatechuic acid was administered to prepubertal male rats at doses of 0, 5, 10, 50 and 100 mg/kg body for 45 consecutive days. The results revealed no treatment-related changes in the body weight gain and organo-somatic indices of the hypothalamus, testes, epididymis, prostate gland and seminal vesicle in rats administered with PCA when compared with control. However, prepubertal exposure to PCA significantly enhanced antioxidant enzyme activities and glutathione level whereas it markedly decreased biomarkers of inflammation and oxidative stress in the hypothalamus, testes and epididymis of the treated rats. Protocatechuic acid significantly increased circulatory concentrations of luteinizing hormone and follicle-stimulating hormone with concomitant increase in serum and intra-testicular testosterone levels. Moreover, PCA-treated rats exhibited significant increase in marker enzymes of testicular function namely acid phosphatase, alkaline phosphatase, lactate dehydrogenase and glucose-6-phosphate dehydrogenase without statistically significant increase in spermatogenesis and sperm functional characteristics including sperm count, motility and viability. Light microscopic examination of the hypothalamus, testes and epididymis of rats treated with PCA showed histo-architectures similar to control. In conclusion, prepubertal exposure to PCA is safe and positively impacted reproductive function at sexual maturity in male rats. The observed beneficial effects of PCA is related to its anti-inflammatory and redox regulatory mechanisms.

    更新日期:2018-05-27
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  • Organic matter from bevelled rim bowls of the Middle Euphrates: Results from molecular characterization using pyrolysis-GC–MS
    Microchem. J. (IF 3.034) Pub Date : 2018-05-02
    Jorge Sanjurjo-Sánchez, Joeri Kaal, Juan Luis Montero Fenollós

    The Middle and Late Uruk period (3600–3100 BCE) is characterised by the diffusion of the Uruk culture in Mesopotamia and surroundings. Uruk sites are recognised by a special kind of pottery called bevelled rim bowls (BRBs), which comprise up to 80% of all recovered Uruk pottery. BRBs are very basic, handmade bowls produced in large quantities but their function is still under debate. Several uses have been proposed, including cooking, measurement of cereal rations, bread preparation, salt making or as votive bowls. Searching for evidence that supports the proposed hypotheses we studied BRB samples from several archaeological sites in the Middle Euphrates (Syria). We analysed fragments of pottery by pyrolysis coupled to gas chromatography and mass spectrometry (Py-GC–MS) to identify organic molecules that could be related to past BRB contents. Additionally, we cooked bread in experimentally produced BRBs to compare results. Up to 93 organic compounds could be identified, including polysaccharides, lignin products and fatty acids. The unequivocal presence of lignocellulose residues (especially 4-vinylguaiacol and other guaiacols, which were also found in experimentally charred bread heated below 450 °C), is compatible with the proposed hypothesis of leavened bread cooking, but a source of incomplete burn off of organic temper cannot be discarded.

    更新日期:2018-05-27
  • A novel methodological approach for the assessment of surface cleaning of acrylic emulsion paints
    Microchem. J. (IF 3.034) Pub Date : 2018-05-04
    Theodora Fardi, Valentina Pintus, Elli Kampasakali, Eleni Pavlidou, Konstantinos G. Papaspyropoulos, Manfred Schreiner, Giorgos Kyriacou

    In the present study a novel methodology was developed for the assessment of surface cleaning treatment of acrylic emulsion paints, with the use of Pyrolysis–Gas Chromatography/Mass Spectrometry (Py–GC/MS). In order to assess the degree of invasiveness of surface treatments applied on acrylic emulsion paints, Py–GC/MS was employed for the direct analysis of the cleaning extracts, aiming to simultaneously detect the main organic components of the acrylic emulsion paints extracted from the paint during cleaning. Commercial acrylic emulsion paints were chosen for the study, containing four different synthetic organic pigments: Hansa yellow (PY3), diketopyrrolopyrrole red (PR264), phthalocyanine blue (PB15) and phthalocyanine green (PG7). Mock ups of paint films were prepared and subjected to artificial soiling and thermal ageing. Py–GC/MS and Fourier Transform Infrared Spectroscopy in Attenuated Total Reflection mode (FTIR–ATR) were used for the identification of the main organic components found in the prepared acrylic paints. Cleaning tests were conducted simulating actual surface cleaning treatment conditions, using a set of different types of wet cleaning systems, including water, aqueous solutions with chelating agents, water in oil (w/o) microemulsion and a siloxane based w/o emulsion. For an integrated physicochemical and aesthetic approach towards the evaluation of the cleaning tests, in parallel with the Py–GC/MS analysis carried out on the cleaning extracts, the degree of soil removal was comparatively evaluated through visual observation and documented in macro and micro scale. Moreover, statistical analysis was performed in the aim of correlating the aesthetic and the physicochemical cleaning assessment results. The study showed that Py–GC/MS is very useful tool for assessing the cleaning of acrylic emulsions and the action of different cleaning systems, making possible to detect minor quantities of the paint's components, through the direct analysis of the cleaning extracts. Some new information on the impact of cleaning treatments on emulsion paints as regards the synthetic organic pigments and the acrylic binder is presented.

    更新日期:2018-05-27
  • Improving reproducibility between batches of silver nanoparticles using an experimental design approach
    Microchem. J. (IF 3.034) Pub Date : 2018-05-12
    Rodrigo Nicolás Núñez, Alicia Viviana Veglia, Natalia Lorena Pacioni

    An optimized method for the synthesis of silver nanoparticles (AgNP) using gallic acid as reductant was achieved using design of experiment strategies based on response surface methodologies. Fractional Factorial Design was used in the screening stage, the Box-Behnken method was employed to model the target responses and finally, the optimization step was done using Desirability function. The obtained AgNP presented improved repetitivity and reproducibility of photophysical properties between batches compared to the synthesis method reported in literature. Intra-assays, intermediate precision and reproducibility tests were performed and proved the different AgNP batches presented equal optical responses, average size and size distribution at a 95% confidence level. In addition, a test on shelf life estimated the optimized AgNP preserve their properties at least for 38 days and especially, zeta potential measurements indicated their low tendency to flocculation as long as 120 days. Furthermore, a remarkable improvement in obtaining reproducible Stern-Volmer constants in fluorescence quenching experiments using Carbazole as fluorophore was observed compared to nanoparticles synthesized by a non-optimal method.

    更新日期:2018-05-27
  • Nutritional characterization of healthy and Aphelenchoides besseyi infected soybean leaves by laser-induced breakdown spectroscopy (LIBS)
    Microchem. J. (IF 3.034) Pub Date : 2018-05-08
    Anielle C. Ranulfi, Giorgio S. Senesi, Jonas B. Caetano, Maurício C. Meyer, Aida B. Magalhães, Paulino R. Villas-Boas, Débora M.B.P. Milori
    更新日期:2018-05-27
  • Acid-base responsive probes for mercury(II) ions in aqueous solution
    Microchem. J. (IF 3.034) Pub Date : 2018-05-12
    Tiziana Del Giacco, Raimondo Germani, Giada Lucci, Matteo Tiecco

    A simple ratiometric optical method for mercuric ion sensing has been developed using an ensemble of an indicator, such as 7-hydroxy-4-methylcoumarin (7H4MC) and bromothymol blue (BTB), and a receptor, such as N,N-bis(p-methoxybenzyl)-3,6-dioxaoctane-1,8-diamines (bis-pMDODA) and cryptand [2.2.2] (C222), in aqueous solution. The equilibrium between indicator and receptor is perturbed by adding Hg2+ ions (0.8–80 μM), due to the formation of a receptor-metal complex, resulting in a change of the UV/Vis spectra. Both sensitivity and selectivity are explained in terms of association constants between receptor and metal ions and equilibrium constants of the reaction between indicator and receptor. Indicator bromothymol blue has also presented a color variation from light blue to yellow upon coordination of Hg2+ to the receptor, which allows a metal naked-eye detection. The detection limit of the system was found to be about 3 μM and the relative standard deviation for five measurements of 20 μM concentration was 5.6%. BTB/7H4MC arrangement showed a particular selectivity over different interfering cations, suffering only interference from Cu2+ ions for Hg2+ sensing.

    更新日期:2018-05-27
  • LC–MS/MS assay for assessing medical adherence in patients under warfarin maintenance therapy
    Microchem. J. (IF 3.034) Pub Date : 2018-05-03
    Faten Farouk, Samir Nabhan, Wilfried M.A. Niessen, Hassan M.E. Azzazy

    Warfarin (WRN) use is plagued by response fluctuation which is managed by dose adjustment. The plasma WRN level had always been an abandoned prerequisite for dose adjustment. However, recent reports had correlated WRN level to the consumed dose. More importantly, the intra-individual alteration in WRN level was found proportional to response fluctuation. This renewed the interest to use WRN level prior to dose adjustment to account for dispensing errors or inadequate adherence. Detection of possibly interacting drugs may further assess compliance and enable a wiser dose adjustment. In this study, an LC–MS/MS assay was developed and validated for the determination of the WRN and the simultaneous detection of interacting drugs in citrated plasma samples normally collected for monitoring international normalized ration (INR). Samples were prepared by liquid-liquid extraction. Separation of WRN and interacting drugs (n = 19) was achieved on an Inertsil®C18 column using a gradient elution program. The assay was applied in 96 plasma samples from patients. The developed method was linear, accurate and precise for WRN determination with average recovery of 99.5 ± 8.4% and no relative matrix effect. WRN plasma level was measured in all samples and possible interacting drugs were detected. An improved WRN-response correlation was observed inter-individually when patient variability was reduced. Our results support the significance of WRN monitoring and suggest the additional monitoring of other interacting drugs for integrated evaluation of patient adherence. The developed method enables ruling-out inadequate adherence prior to unnecessary dose adjustment and highlights the need to strengthen patient education procedures.

    更新日期:2018-05-27
  • A traffic light-type sensitive visual detection of mercury by golden nanoclusters mixed with fluorescein
    Microchem. J. (IF 3.034) Pub Date : 2018-05-17
    Wenqing Deng, Rui Dai, Pingyue Hu, Qianqian Li, Xiaoli Xiong, Ke Huang, Feng Huo

    A novel colorimetric sensor based on red-emitting bovine serum albumin‑golden nanoclusters (BSA-AuNCs) and green-colored fluorescein that exhibited traffic light-type color change was developed for ratiometric and visual detection of mercury (Hg). In the presence of Hg2+, the red fluorescence from BSA-AuNCs was quenched while the green fluorescein was inert thus as a reference. And it presented traffic light-type (red, yellow and green) color in the low, middle and high concentration of Hg2+. A potential mechanism was investigated by Energy Dispersive Spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS). The selective quenching mechanism may be due to the formation of gold amalgam bonds between BSA-AuNCs and Hg2+. A linear correlation was constructed for Hg2+ in the concentration range of 10–500 μg L−1. A limit of detection (LOD) of 7.4 μg L−1 and a relative standard deviation (RSD, n = 7) of 0.4% were obtained, which can be used to monitor the concentration of Hg2+. In visual detection, as low as 0.1 μg mL−1 of Hg2+ can be easily discriminated from the blank with the naked eye. The proposed method was validated by analysis of certified environment and food samples with satisfactory results.

    更新日期:2018-05-27
  • Development of a ruthenium(II) complex-based luminescence probe for detection of hydrogen sulfite in food samples
    Microchem. J. (IF 3.034) Pub Date : 2018-05-18
    Wenzhu Zhang, Hua Liu, Feiyue Zhang, Yong-Lei Wang, Bo Song, Run Zhang, Jingli Yuan
    更新日期:2018-05-27
  • Parameters affecting the exposure to furfuryl alcohol from coffee
    Food Chem. Toxicol. (IF 3.778) Pub Date : 2018-05-26
    Abdullatif Albouchi, Julia Russ, Michael Murkovic

    Recently, furfuryl alcohol (FFA) was labelled a human potential carcinogen (group 2B) by the International Agency for Research on Cancer. Its alimentary exposure is mostly from coffee since in any other foods the concentrations are significantly lower. The various storage conditions of roasted coffee, the different brewing techniques applied and the bioaccessibility after ingestion are potential parameters that might alter the exposure to FFA from coffee. An 8 weeks stability study at varying temperatures showed that FFA is stable in the ground coffee matrix. Moreover, different brewing techniques extracted different amounts of FFA and affected its final concentration. The evaluation of the relative exposure to four furans (FFA, 5-hydroxymethyl-furaldehyde, 2-furoic acid, and 5-hydroxymethyl-2-furoic acid) revealed that FFA amounts were at least 2-fold the amounts of other studied furans in the same brew. A 22-fold variation in the concentration of the four furans in brews prepared using different coffee grounds and brewing techniques could be observed. 90% of the four furans were extracted by the first 25-30% fraction of the filter brew. A significant decrease of FFA is observed after stressing with simulated gastric fluid. However, this decrease could not be reproduced when mimicking a regular coffee ingestion situation.

    更新日期:2018-05-27
  • Removal of Cu2+ and Ni2+ from aqueous solution using SnO2 nanomaterial effect of: pH, time, temperature, interfering cations
    Microchem. J. (IF 3.034) Pub Date : 2018-05-14
    Abigail M. Zepeda, Daisy Gonzalez, Luis Gonzalez Heredia, Karina Marquez, Cesar Perez, Erika Pena, K. Flores, C. Valdes, T.M. Eubanks, J.G. Parsons, J. Cantu

    Tin oxide, SnO2, nanomaterial was synthesized and tested for the removal of Cu2+ and Ni2+ ions from aqueous solutions. Various parameters for the binding were investigated in batch studied, which included pH, time, temperature, and interferences. In addition, isotherm studied was performed to determine the maximum binding capacity for both Cu2+ and Ni2+ ions. The optimal binding pH determined from the effects of pH were to be at pH 5 for both the Cu2+ and Ni2+ ions. The isotherm studies were performed at temperatures of 4 °C, 25 °C, and 45 °C for both the Cu2+ and Ni2+ ions and were found to follow the Langmuir isotherm model. The binding capacities for the Cu2+ ions were 2.63 mg/g, 2.95 mg/g and 3.27 mg/g at the aforementioned temperatures, respectively. Whereas the binding capacities for Ni2+ were 0.79 mg/g, 1.07 mg/g, and 1.46 mg/g at the respective temperatures. The determined thermodynamic parameters for the binding showed that the binding processes for the reactions were endothermic, as the ΔG was observed to decrease with decreasing temperatures. As well the ∆H was 28.73 kJ/mol for Cu2+ (III) and 13.37 kJ/mol for Ni2+. The ∆S was observed to be 92.65 J/mol for Cu2+ and 54.53 J/mol for Ni2+. The free energy of adsorption for the Cu2+ was determined to be 13.99 kJ/mol and the activation energy for the binding of Ni2+ was determined to be 8.09 kJ/mol. The activation energy data indicate that the reaction was occurring through chemisorption.

    更新日期:2018-05-27
  • Sterigmatocystin: A mycotoxin to be seriously considered
    Food Chem. Toxicol. (IF 3.778) Pub Date : 2018-05-26
    César Horacio Díaz Nieto, Adrian Marcelo Granero, María Alicia Zon, Héctor Fernández
    更新日期:2018-05-27
  • Optimization of simultaneous determination of metals in commercial pumpkin seed oils using inductively coupled atomic emission spectrometry
    Microchem. J. (IF 3.034) Pub Date : 2018-05-19
    Milan Mitić, Aleksandra Pavlović, Snežana Tošić, Pavle Mašković, Danijela Kostić, Snežana Mitić, Gordana Kocić, Jelena Mašković

    In this work, the inductively coupled plasma atomic emission spectrometry (ICP-AES) was developed and validated for determination of 27 metals in nine pumpkin oils from two production processes (cold pressed and roasted). A microwave assisted digestion was applied for the dissolution of the samples. To evaluate plasma robustness and analytical performance, the Mg II 280.270 nm/Mg I 285.213 nm (Mg II/Mg I) line intensity ratio was used. The robust plasma conditions in axial/radial view mode were reached at an RW power of 1150 W and an argon nebulizer flow rate of 0.5 L/min. The method is evaluated by application of the standard addition method and by recovery test. In general, the recoveries for all elements in pumpkin seed oils were between 90% and 110% except, only for Cd, Pb and As they were <90% and >110%. The most abundant element is K followed by, Mg, P, Ca and Na. Pumpkin seed oils were also found to be a good source of Fe, Zn, Cu and Mn. The highest levels of analyzed elements were found in pumpkin seed oils producing from the roasted pumpkin seed paste. In all samples, the content of heavy metals was below the recommended tolerable levels proposed by Joint FAO/WHO Expert Committee on Food Additives and does not a pose a health risk for the consumer. The levels of the metals in pumpkin seed oils were also compared with those reported by the literature. Cluster analysis (CA) of the analytical data confirmed the observed differences between oils from two production processes.

    更新日期:2018-05-27
  • In vivo investigation of the volatile metabolome of antiphytopathogenic yeast strains active against Penicillium digitatum using comprehensive two-dimensional gas chromatography and multivariate data analysis
    Microchem. J. (IF 3.034) Pub Date : 2018-05-21
    João Raul Belinato de Souza, Katia Cristina Kupper, Fabio Augusto

    Penicillium digitatum is the responsible for green mold decay on citrus fruits, which contributes to economic losses in agriculture industry during storage, transportation and in the market. Biocontrol agents may be a viable and low-cost alternative in the control of different plant pathogens: metabolites from some yeast strains can prevent infection, decreasing host tissue colonization and reducing pathogen survival and sporulation with varying degrees of efficiency. Eight S. cerevisae strains and one Candida stellimalicola strain all were evaluated in vitro as biological control agents against P. digitatum. After in vitro tests the headspace of yeast strains were extracted in vivo using an optimized HS-SPME + GC × GC–MS method. The correlation between antiphytopathogenic activity with the volatile metabolite profiles was assessed using principal component analysis. Nine compounds were associated with the volatile metabolome of strains with higher antifungal action: ethyl propionate, 3-methyl-1-butanol, 2-methyl-1-butanol, ethyl butyrate, 3-methylbutyl acetate, 3-methylbutyl propionate, n-pentyl butyrate, phenylethyl alcohol and 2-phenethyl acetate. This study allowed for the first time a comprehensive overview of the effect of individual volatile metabolites from yeast strains on P. digitatum infection.

    更新日期:2018-05-27
  • Two-stage probe atomization GFAAS for direct determination of trace Cd and Pb in whole bovine blood
    Microchem. J. (IF 3.034) Pub Date : 2018-05-19
    Artyom V. Volzhenin, Natalya I. Petrova, Tatyana V. Skiba, Anatoly I. Saprykin

    Graphite furnace atomic absorption spectrometry (GFAAS) is rarely used for direct trace analysis of whole blood because of strong interferences caused by the organic matrix. Especially it concerns bovine blood samples, containing more proteinaceous and lipid components in comparison with human blood. In our work, the novel two-stage probe atomization (TPA) technique for Cd and Pb determination by GFAAS in whole bovine blood with minimum sample pre-treatment has been developed. Making use of TPA and chemical modifier has eliminated matrix suppression and decreased the non-selective absorption level by several times. It allowed us to dispense with brief sample pre-treatment by a mixture of nitric acid and hydrogen peroxide (1:1) without autoclave digestion. The pyrolysis temperatures were 650 °C for Cd and 900 °C for Pb in the presence of Pd modifier. The analytical signal dependence on the number of concentrating cycles has been studied. The maximal number of capturing cycles was found (15 and 10 for Cd and Pb). Applying of multiple probe concentrating has additionally decreased the limits of detection (LODs) comparing with single TPA. The achievable LODs in optimized conditions were found to be 0.01 and 0.2 μg/L for Cd and Pb, respectively (3 s test). The accuracy of the proposed technique was confirmed by anodic stripping voltammetry (ASV). The relative standard deviation for 5.1 μg/L Cd and 26 μg/L Pb concentrations was 6.4% and 7.5%, respectively.

    更新日期:2018-05-27
  • Investigation of organic media and surfactant sensitization in non-aqueous phase hydride generation-atomic fluorescence spectrometric determination of antimony
    Microchem. J. (IF 3.034) Pub Date : 2018-05-18
    Luqiong Chen, Zirong Lei, Kan Hu, Shengchun Yang, Xiaodong Wen

    This work was the expansion and in-depth study based on the previously established non-aqueous phase HG system. Aiming at the determination of antimony by the developed non-aqueous phase HG, the effect of different organic media and the sensitization effect of surfactant on the non-aqueous phase HG reaction were investigated. As an important condition, organic media has an important influence on this method. This study found that the surfactant Triton X-114 had very good sensitization effect for non-aqueous HG reaction. The sensitization effect of surfactant in different organic media was different. Among the investigated media, the comprehensive performance of octanol was the best under the sensitization effect of surfactant. Compared with the analytical performance of not adding surfactant, the sensitization factor of the surfactant was 1.55. The sensitization effect of surfactant Triton X-114 on the HG reaction in the octanol media was very significant, which greatly improved the analytical performance of the non-aqueous HG method. Under the optimal conditions, the limit of detection (LOD) was 0.04 μg/L. Compared to conventional HG-AFS, the efficiency of non-aqueous phase HG and the analytical performance of the developed method was considerably improved.

    更新日期:2018-05-27
  • Quantitative determination of the veterinary drug monensin in horse feed samples by square wave voltammetry (SWV) and direct infusion electrospray ionization tandem mass spectrometry (DI–ESI–MS/MS)
    Microchem. J. (IF 3.034) Pub Date : 2018-05-18
    Konrad Rudnicki, Pavlína Landová, Monika Wrońska, Sławomir Domagała, Josef Čáslavský, Milada Vávrová, Sławomira Skrzypek
    更新日期:2018-05-27
  • Advancements in the chemical structures of Ergot acyl glycerides by high performances liquid chromatography coupled with high resolution mass spectrometry
    Microchem. J. (IF 3.034) Pub Date : 2018-05-17
    Jacopo La Nasa, Jeannette J. Lucejko, Hans-Ulrich Humpf, Erika Ribechini

    A comprehensive picture of the chemical composition and structure of the acyl-glycerides from ergot (fungi of the genus Claviceps) sclerotia was carried out using liquid chromatography coupled with high resolution mass spectrometry (HPLC-ESI-Q-ToF) following microwave solvent extraction. The method allowed us to study the chemical structures of >70 compounds being most of these reported and characterized here for the first time in ergot sclerotia. Diglycerides, triglycerides and estolides were proper preliminary separated using reverse phase chromatography and the unambiguous chemical structure of each species was characterized using high resolution tandem mass spectrometry. Our data and results could be useful for anyone interested in detecting ergot contaminations in cereals and deriving products, as alternative to the identification of alkaloids, in better understanding the behavior of ergot fungi in biological contest and in evaluating the potential uses of ergot estolides in industrial applications.

    更新日期:2018-05-27
  • Analytical applications of Cu@PtPd/C nanoparticles for the quantification of hydrogen peroxide
    Microchem. J. (IF 3.034) Pub Date : 2018-05-17
    F.A. Gutierrez, I.S. Giordana, V.C. Fuertes, A.E. Montemerlo, J.M. Sieben, A.E. Alvarez, M.D. Rubianes, G.A. Rivas

    This work reports a non-enzymatic amperometric sensor for hydrogen peroxide based on the use of a glassy carbon composite electrode modified with core-shell Cu@PtPd/C nanoparticles. Cu@PtPd/C presents an important electrocatalytic activity towards hydrogen peroxide reduction. The comparison of the sensitivities and the charge transfer resistances for hydrogen peroxide at the glassy carbon composite electrode modified with 5.0% w/w Pt/C, Pd/C, Pd/C + Pt/C and Cu@PtPd/C demonstrate a clear synergism on the catalytic reduction of hydrogen peroxide at −0.100 V when having Pt, Pd and Cu incorporated in the core-shell nanostructure. The best compromise between sensitivity, reproducibility and response time was reached with 20.0% w/w Cu@PtPd/C. For the selected sensor (glassy carbon composite electrode containing 20.0% w/w GCPE/Cu@PtPd/C) the analytical parameters are highly competitive compared to similar devices reported in the last years, with a linear relationship between current and hydrogen peroxide concentration between 5.0 × 10−6 and 2.5 × 10−4 M, sensitivity of (5.30 ± 0.09) × 105 μAM−1 cm−2 (r2 = 0.998) and detection limit of (3.7 ± 0.5) × 10−7 M. The resulting sensing platform was successfully used for the quantification of hydrogen peroxide in a mouth-wash sample.

    更新日期:2018-05-27
  • Mixture design and Doehlert matrix for optimization of the ultrasonic assisted extraction of caffeic acid, rutin, catechin and trans-cinnamic acid in Physalis angulata L. and determination by HPLC DAD
    Microchem. J. (IF 3.034) Pub Date : 2018-05-17
    Gisele Chagas Moreira, Fabio de Souza Dias

    The present article describes the development of an ultrasonic assisted extraction of phenolic compounds in Physalis angulata and determination of caffeic acid, rutin, catechin and trans-cinnamic acid by HPLC DAD. The mixtures were composed of extractor solvent and its ratio optimized using a mixture design. Doehlert matrix was used to optimize the extractor solvent volume and sonication time while using total phenolics as analytical response. The optimized conditions for the extractor solvent were the ratio of: 57% water, 35% ethanol and 8% methanol. The best experimental conditions for ultrasound were a sonication time of 10 min and extractor volume of 15 mL. The limit of detection varied from 5.0 to 30 μg L−1. The methods precision was expressed as relative standard deviation (RSD) and presented values lower than 3.0% for all analytes. The accuracy was evaluated using spike test with recoveries between 91% and 107%. The method was applied for the determination of caffeic acid, rutin, catechin and trans-cinnamic in four samples of Physalis angulata aerial parts and the concentration varied from 15.5 to 22.5 μg g−1 for catechin, from 25.0 to 32.5 μg g−1 for caffeic acid, 75.6 to 88.2 μg g−1 for rutin and varied from 23.5 to 110.7 μg g−1 for trans-cinnamic acid.

    更新日期:2018-05-27
  • High throughput screening of phenolic constituents in a complex sample matrix using post-column derivatisations employing reaction flow HPLC columns
    Microchem. J. (IF 3.034) Pub Date : 2018-03-16
    Andrew Jones, Agustín Acquaviva, Gary R. Dennis, R. Andrew Shalliker, Arianne Soliven

    This communication is the first to demonstrate the high throughput power of a 30 mm in length reaction flow (RF) column to conduct a targeted analysis of phenolics in a complex sample matrix (tea) utilising post-column derivatisation (PCD). Sensitivity, speed and efficiency could be tuned via the selection of the RF column separation flow rate. RF-PCD compared to conventional PCD approach with a 100 μL loop resulted in a gain of up to 150% in sensitivity. The reaction loop volumes employed in conventional PCD approaches will always be the limitation for compatibility with low dispersion chromatography systems and/or columns.

    更新日期:2018-05-27
  • A silver nanoparticle-based colorimetric assay of trace selenium with hydride generation for sample introduction
    Microchem. J. (IF 3.034) Pub Date : 2018-05-22
    Shixu Huang, Yongna Jin, Guoming Cao, Yunfei Tian, Kailai Xu, Xiandeng Hou

    A highly selective, sensitive yet simple colorimetric assay was developed for Se(IV) detection based on the silver nanoparticles (AgNPs), with hydride generation for separation and sample introduction. The proposed method could be easily performed by introducing the hydride vapor of the analyte (H2Se) into a thioglycolic acid (TGA) capped AgNPs solution. A combination of experimental and theoretical studies was used to illustrate the mechanism of this AgNPs colorimetric assay. The strong interaction of AgNPs with Se0 (oxidation product of H2Se) and/or H2Se weakens the stabilizing effect of TGA on AgNPs, leading to the aggregation of AgNPs and thus the color change of the AgNPs solution from bright yellow to light yellow or even colorless with the increase of Se(IV) concentration. The limit of detection was found to be 5 μg L−1 with UV–vis spectrophotometric detection, and 50 μg L−1 with the naked eye visual observation. The proposed method showed excellent selectivity and was successfully applied for Se(IV) determination in fish protein and sea water samples.

    更新日期:2018-05-27
  • NMR and multivariate data analysis to assess traceability of argentine citrus
    Microchem. J. (IF 3.034) Pub Date : 2018-05-22
    Mario O. Salazar, Pablo L. Pisano, Manuel González Sierra, Ricardo L.E. Furlan

    Argentine citrus industry stands out among the top ten largest producers of citrus of the world. Traceability is a key point of the quality control in the international trade context. Discrimination between orange juices produced from different geographical regions in Argentina (San Pedro and Entre Ríos), has been achieved by applying principal components analysis (PCA) and partial least-squares – discriminant analysis (PLS–DA) to 1H NMR spectra of the juices. Different regions of the spectra were analyzed in view of the large range of signal intensities and the chemometric treatment of the NMR data has successfully distinguished the juice of different origins/varieties, as well as the metabolites responsible for their separation. Examination of the PCA loadings showed that citric acid and ethanol levels were the main chemical variables for sample discrimination.

    更新日期:2018-05-27
  • 更新日期:2018-05-27
  • Carotenoids and xanthophyll esters of yellow and red nance fruits (Byrsonima crassifolia (L.) Kunth) from Costa Rica
    Food Res. Int. (IF 3.086) Pub Date : 2018-05-26
    Andrea Irías-Mata, Víctor M. Jiménez, Christof Björn Steingass, Ralf M. Schweiggert, Reinhold Carle, Patricia Esquivel
    更新日期:2018-05-27
  • High content analysis of sea buckthorn, black chokeberry, red and white currants microbiota – A pilot study
    Food Res. Int. (IF 3.086) Pub Date : 2018-05-26
    Juliana Lukša, Iglė Vepštaitė-Monstavičė, Vyacheslav Yurchenko, Saulius Serva, Elena Servienė

    The high potential of sea buckthorn, black chokeberry, red and white currants in healthy food industry boosted interest in the plant cultivation. The present study is the first work providing comprehensive information on microbial populations of these berries. Next Generation Sequencing allowed identification of eukaryotic and prokaryotic microorganisms prevalent on specific berries, including uncultivable microorganisms. Our study revealed the broad diversity of berries-associated bacterial and fungal microorganisms. Analysis of representative microbial OTUs showed a clear separation among inhabitants of sea buckthorn, black chokeberry and both currants, indicating plant-defined differences in the composition of the bacterial and fungal microbiota. Among the microorganisms distributed on tested berries, we documented potentially beneficial fungi and bacteria along with potential phytopathogens or those harmful for humans. Thus, plant microbiota appears to be highly relevant for the evaluation of the microbiota impact on food quality and human health.

    更新日期:2018-05-27
  • Moringa plants: Bioactive compounds and promising applications in food products
    Food Res. Int. (IF 3.086) Pub Date : 2018-05-26
    S. Saucedo-Pompa, J.A. Torres-Castillo, C. Castro-López, R. Rojas, E.J. Sánchez-Alejo, M. Ngangyo-Heya, G.C.G. Martínez-Ávila
    更新日期:2018-05-27
  • Assessing the influence of pod storage on sugar and free amino acid profiles and the implications on some Maillard reaction related flavor volatiles in Forastero cocoa beans
    Food Res. Int. (IF 3.086) Pub Date : 2018-05-26
    Michael Hinneh, Evangeline Semanhyia, Davy Van de Walle, Ann De Winne, Daylan Amelia Tzompa-Sosa, Gustavo Luis Leonardo Scalone, Bruno De Meulenaer, Kathy Messens, Jim Van Durme, Emmanuel Ohene Afoakwa, Luc De Cooman, Koen Dewettinck
    更新日期:2018-05-27
  • 更新日期:2018-05-27
  • Effects of co-composting of lincomycin mycelia dregs with furfural slag on lincomycin degradation, maturity and microbial communities
    Bioresource Technol. (IF 5.651) Pub Date : 2018-05-26
    Shengtao Ren, Xiali Guo, Aqian Lu, Xiaoying Guo, Yan Wang, Guoping Sun, Weiwei Guo, Chaobin Ren, Lianzhong Wang
    更新日期:2018-05-27
  • Role of sawdust and cow dung on compost maturity during rotary drum composting of flower waste
    Bioresource Technol. (IF 5.651) Pub Date : 2018-05-26
    Dayanand Sharma, Kunwar D. Yadav, Sunil Kumar
    更新日期:2018-05-27
  • 更新日期:2018-05-27
  • 更新日期:2018-05-27
  • 更新日期:2018-05-27
  • A Generalized Groundwater Fluctuation Model Based on Precipitation for Estimating Water Table Levels of Deep Unconfined Aquifers
    J. Hydrol. (IF 3.483) Pub Date : 2018-05-25
    Jina Jeong, Eungyu Park, Weon Shik Han, Kue-Young Kim, Heejun Suk, Si Beom Jo

    A generalized water table fluctuation model based on precipitation was developed using a statistical conceptualization of unsaturated infiltration fluxes. A gamma distribution function was adopted as a transfer function due to its versatility in representing recharge rates with temporally dispersed infiltration fluxes, and a Laplace transformation was used to obtain an analytical solution. To prove the general applicability of the model, convergences with previous water table fluctuation models were shown as special cases. For validation, a few hypothetical cases were developed, where the applicability of the model to a wide range of unsaturated zone conditions was confirmed. For further validation, the model was applied to water table level estimations of three monitoring wells with considerably thick unsaturated zones on Jeju Island. The results show that the developed model represented the pattern of hydrographs from the two monitoring wells fairly well. The lag times from precipitation to recharge estimated from the developed system transfer function were found to agree with those from a conventional cross-correlation analysis. The developed model has the potential to be adopted for the hydraulic characterization of both saturated and unsaturated zones by being calibrated to actual data when extraneous and exogenous causes of water table fluctuation are limited. In addition, as it provides reference estimates, the model can be adopted as a tool for surveilling groundwater resources under hydraulically stressed conditions.

    更新日期:2018-05-27
  • 更新日期:2018-05-27
  • An upscaling procedure for the optimal implementation of open-loop geothermal energy systems into hydrogeological models
    J. Hydrol. (IF 3.483) Pub Date : 2018-05-26
    Sylvia Muela Maya, Alejandro García-Gil, Eduardo Garrido Schneider, Miguel Mejías Moreno, Jannis Epting, Enric Vázquez-Suñé, Miguel Ángel Marazuela, José Ángel Sánchez-Navarro

    Different aspects of management policies for shallow geothermal systems are currently under development. Although this technology has been used for a long time, doubts and concerns have been raised in the last years due to the massive implementation of new systems. To assess possible environmental impacts and manage subsurface energy resources, collecting data from operating shallow geothermal systems is becoming mandatory in Europe. This study presents novel advances in the upscaling of operation datasets obtained from open-loop geothermal energy systems for an optimal integration in hydrogeological models. The proposed procedure allows efficient numerical simulations to be performed at an urban scale. Specifically, this work proposes a novel methodology to optimize the data treatment of highly transient real exploitation regimes by integrating energy transfer in the environment to reduce more than 90% registered raw datasets. The proposed methodology is then applied to and validated on five different real optimization scenarios in which upscaling transformation of the injection temperature series of 15-minute sampling frequency has been considered. The error derived from each approach was evaluated and compared for validation purposes. The results obtained from the upscaling procedures have proven the usefulness and transferability of the proposed method for achieving daily time functions to efficiently reproduce the exploitation regimes of these systems with an acceptable error in a sustainable resource management framework.

    更新日期:2018-05-27
  • The effect of rain gauge density and distribution on runoff simulation using a lumped hydrological modelling approach
    J. Hydrol. (IF 3.483) Pub Date : 2018-05-26
    Qiang Zeng, Hua Chen, Chong-Yu Xu, Meng-Xuan Jie, Jie Chen, Sheng-Lian Guo, Jie Liu

    Most lumped hydrological models use areal average precipitation data as model input. Though weather-radar-based and satellite-based precipitation estimation methods have been proposed in recent years, the rain gauge is still the most widely used precipitation-measuring tool. Optimal selection of rain gauge number and location will improve the accuracy of areal average precipitation estimations with minimum cost. In this study, the impacts of rain gauge density and distribution on lumped hydrological modelling uncertainty with different catchment sizes are analysed. To this end, the performances of a lumped hydrological model, the Xinanjiang model, in a densely gauged river basin, the Xiangjiang River basin, and its sub-basins under different gauge density and distribution are compared. First, seven levels of rain gauge density are defined. For each density level, several samples of different rain gauge distributions are randomly selected. Then, the areal average precipitation of each sample is estimated and used as input to the Xinanjiang model. Finally, the model is calibrated using the shuffled complex evolution (SCE-UA) algorithm, and model uncertainty is evaluated via the Bayesian method. The results show that 1) imperfect precipitation inputs measured by a sparse and irregular rain gauge network will lead to substantial uncertainty in model parameter estimation and flood simulation; 2) the impacts of imperfect precipitation estimates on model efficiency can be reduced to some extent through the adjustment of model parameters; 3) modelling uncertainty is reduced by increasing the rain gauge density or optimizing the rain gauge distribution pattern; and 4) the improvement in lumped model efficiency is no longer significant when the rain gauge density exceeds a certain threshold, but a further increase in rain gauge density will reduce model parameter uncertainty and the width of the runoff confidence interval.

    更新日期:2018-05-27
  • In vitro anti-inflammatory activity among probiotic Lactobacillus species isolated from fermented foods
    J. Funct. Foods (IF 3.144) Pub Date : 2018-05-26
    Sundru Manjulata Devi, Nawneet K. Kurrey, Prakash M. Halami

    Probiotic bacteria have the ability to alter immune response conferring treatment to inflammatory diseases. In the current study, probiotic Lactobacillus strains were subjected to adhesion to epithelial Caco-2 cells. Subsequently, gene expression of pro-and anti-inflammatory genes were studied under three stimulation conditions (which includes LPS-challenge, stress induction and pathogens invasion). Herein, immunomodulatory activity of native Lactobacillus strains (n = 3) were compared to L. rhamnosus GG. The studied strains had down-regulated the gene expression of pro-inflammatory cytokines (CKs) (like TNF-α, IL-1α, IL-1β, IL-6 and IL-8) and up-regulated the anti-inflammatory CKs like TGFβ1, IL-4, and IL-10. Gene expression of TLR2 has also been noted. Strain-specific interactions were noticed during the different probiotic treatment. Further, phylogenetic dendrogram of mucin adhesion domain suggested the interaction of Lactobacillus and Listeria species, explaining competitive colonization and exclusion mechanism in an ecological niche. Overall, isolate L. paraplantarum MTCC 9483 has effectively modulated induced conditions by its anti-inflammatory activity.

    更新日期:2018-05-27
  • PMFs-rich Citrus extract prevents the development of non-alcoholic fatty liver disease in C57BL/6J mice induced by a high-fat diet
    J. Funct. Foods (IF 3.144) Pub Date : 2018-05-26
    Zunli Ke, Ziyan Zhao, Yuanyuan Zhao, Xiaodan Xu, Yin Li, Si Tan, Cheng Huang, Zhiqin Zhou
    更新日期:2018-05-27
  • 更新日期:2018-05-27
  • Effect of soluble dietary fibre on postprandial blood glucose response and its potential as a functional food ingredient
    J. Funct. Foods (IF 3.144) Pub Date : 2018-05-26
    Yvonne M. Cassidy, Emeir M. McSorley, Philip J. Allsopp
    更新日期:2018-05-27
  • Resveratrol has not been proven its enhancement of the physical activity among users: A systematic review and meta-analysis study
    J. Funct. Foods (IF 3.144) Pub Date : 2018-05-26
    Chainarong Srilacorn, Apisada Choosathan, Siriporn Seesuthok, Somsak Kongna, Surachai Kotirum
    更新日期:2018-05-27
  • Galangin’s potential as a functional food ingredient
    J. Funct. Foods (IF 3.144) Pub Date : 2018-05-26
    Kit-Kay Mak, Joe-Jen Tan, Puvaneswari Marappan, Madhu Katyayani Balijepalli, Hira Choudhury, Srinivasan Ramamurthy, Mallikarjuna Rao Pichika
    更新日期:2018-05-27
  • Release of phenolics compounds from Rubus idaeus L. dried fruits and seeds during simulated in vitro digestion and their bio-activities
    J. Funct. Foods (IF 3.144) Pub Date : 2018-05-26
    Yin Qin, Lu Wang, Yufeng Liu, Qunying Zhang, Yongxia Li, Zhenqiang Wu
    更新日期:2018-05-27
  • Mulberry leaf tea alleviates diabetic nephropathy by inhibiting PKC signaling and modulating intestinal flora
    J. Funct. Foods (IF 3.144) Pub Date : 2018-05-26
    Yao Sheng, Shujuan Zheng, Chuanhai Zhang, Changhui Zhao, Xiaoyun He, Wentao Xu, Kunlun Huang
    更新日期:2018-05-27
  • Characterization and in vitro evaluation of seaweed species as potential functional ingredients to ameliorate metabolic syndrome
    J. Funct. Foods (IF 3.144) Pub Date : 2018-05-26
    Daniel Rico, Ana Belén Martín Diana, Iñaki Milton-Laskibar, Alfredo Fernández-Quintela, Jose Manuel Silván, Dilip K. Rai, Alka Choudhary, Elena Peñas, Daniel Antonio de Luis, Cristina Martínez-Villaluenga
    更新日期:2018-05-27
  • Effects of green tea extract on oxidative stress and renal function in diabetic individuals: A randomized, double-blinded, controlled trial
    J. Funct. Foods (IF 3.144) Pub Date : 2018-05-26
    Sáskia Ribeiro Vaz, Luiza Moreira Nogueira de Amorim, Pamella Vanessa Freitas de Nascimento, Valéria Soares Pigozzi Veloso, Marina Sayuri Nogueira, Inar Alves Castro, João Felipe Mota, Patrícia Borges Botelho
    更新日期:2018-05-27
  • Chitobiose alleviates oleic acid-induced lipid accumulation by decreasing fatty acid uptake and triglyceride synthesis in HepG2 cells
    J. Funct. Foods (IF 3.144) Pub Date : 2018-05-26
    Xiaodan Li, Mengyao Zhao, Liqiang Fan, Xuni Cao, Liehuan Chen, Junhui Chen, Y. Martin Lo, Liming Zhao
    更新日期:2018-05-27
  • Bifidobacterium spp. reshaping in the gut microbiota by low dose of juçara supplementation and hypothalamic insulin resistance in Wistar rats
    J. Funct. Foods (IF 3.144) Pub Date : 2018-05-26
    Giovana Jamar, Aline Boveto Santamarina, Laís Vales Mennitti, Helena de Cássia Cesar, Lila Missae Oyama, Veridiana Vera de Rosso, Luciana Pellegrini Pisani
    更新日期:2018-05-27
  • 更新日期:2018-05-27
  • Upregulation of SIRT1 contributes to the cardioprotective effect of Rutin against myocardial ischemia-reperfusion injury in rats
    J. Funct. Foods (IF 3.144) Pub Date : 2018-05-26
    Qiao Lin, Xiu-Ying Chen, Ji Zhang, Yong-Liang Yuan, Wen Zhao, Bo Wei

    The mechanisms underlying beneficial actions of Rutin, a food derived-polyphenolic bioflavonoid, against myocardial ischemia-reperfusion (MI/R) injury were detected. We found that Rutin could significantly ameliorate infarct size and attenuate cardiac dysfunctionto in some extent. Additionally, Rutin could also improve variation of myocardial zymogram and up-regulate antioxidant systems in heart. The selective SIRT1 inhibitor, Ex-527, exacerbated MI/R injury as evidenced by further increased oxidative stress and infracted area in heart tissue. Importantly, Ex-527 abolished the cardioprotective effect of Rutin in MI/R rats. Docking analysis further demonstrated the vital role of SIRT1 on Rutin's cardioprotective effect. We found that activation of SIRT1/Nrf2 signaling induced by Rutin contributes to the reduced oxidative stress, along with decreased apoptosis of cardiomyocytes in heart tissue. Overall, our findings suggest that SIRT1/Nrf2 signaling pathway may be a potential therapeutic target for the treatment of oxidative stress and apoptosis related myocardial diseases.

    更新日期:2018-05-27
  • Li0.75Mn1.50Fe1.75(PO4)3: First alluaudite-type iron phosphate containing only Li+ as alkaline ions
    J. Solid State Chem. (IF 2.299) Pub Date : 2018-05-26
    Khiem Trad, Aurore Castets, Alain Wattiaux, Claude Delmas, Mongi Ben Amara, Dany Carlier
    更新日期:2018-05-27
  • Preventive effect of genistein on AOM/DSS-induced colonic neoplasm by modulating the PI3K/AKT/FOXO3 signaling pathway in mice fed a high-fat diet
    J. Funct. Foods (IF 3.144) Pub Date : 2018-05-26
    Shumin Song, Dai Cheng, Shuoming Wei, Xufeng Wang, Yabing Niu, Wentao Qi, Chunling Wang
    更新日期:2018-05-27
  • 更新日期:2018-05-27
  • 更新日期:2018-05-27
Some contents have been Reproduced with permission of the American Chemical Society.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
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