Flurbiprofen conjugates based on hydroxyethylcellulose: Synthesis, characterization, pharmaceutical and pharmacological applications Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-21 Khawar Abbas, Muhammad Ajaz Hussain, Syed Nasir Abbas Bukhari, Muhammad Amin, Muhammad Nawaz Tahir, Sheshanath V. Bhosale
Present study deals with fabrication of macromolecular prodrugs (MPDs) of flurbiprofen (FLB) with hydroxyethylcellulose (HEC). FLB was activated using p-toluenesulfonyl chloride and reacted with pre-dissolved HEC to yield HEC-FLB conjugates 1-3. Resultant prodrugs showed moderate to high degree of substitution (DS: 0.40-1.74) and assembled into nanoparticles of 220-550 nm at water/DMSO interface. Pharmacokinetic studies of HEC-FLB conjugate revealed a tmax of 4.0 h indicating delayed release of FLB while t1/2 of 10.63 h indicated sustained release characteristics of the conjugate in rabbit model. Pharmacological studies revealed that HEC-FLB conjugates had immunomodulatory potential as results showed 34 and 36% inhibition of Interleukin-6 and tumor necrosis factor-α, respectively. A 79% inhibition of paw edema indicated anti-inflammatory properties of the conjugates. Cell viability studies indicated safety of the conjugates to L929 cell lines up to 24 h in the range of 2-10 mM. Moreover, thermal analysis indicated greater stability of MPDs than FLB.
Novel supercapacitor electrodes based semiconductor nanoheterostructure of CdS/rGO/CeO2 as efficient candidates Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-19 Asma A.Ali, Ahmed Adel Nazeer, Metwally Madkour, Ali Bumajdad, Fakhreia Al Sagheer
In this study, we have synthesized metal oxide/metal sulphide based nanoheterostuctures mediated with graphene nanosheets. The synthesized nanoheterostructures were characterized via different techniques such as XRD, XPS, and TEM. The electrochemical characteristics of the investigated nanoheterostucture (CdS/rGO/CeO2) were investigated through electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and galvanostatic charge-discharge. The specific capacitance of the single rGO, binary CdS/CeO2 and ternary CdS/rGO/CeO2 heterostructures were measured. The CdS/rGO/CeO2 nanoheterostucture showed the most excellent cycling stability with high specific capacitance of 407 F g−1 achieved at a charge-discharge rate of 1 A/g. The investigated supercapacitor retained about 96% of the initial energy density after charge-discharge at a 10 A/g for 5000 cycles. The ternary CdS/rGO/CeO2 nanoheterostucture revealed the best specific capacitance as the graphene nanosheets increasd interfacial electron transfer. The results revealed that the investigated novel nanoheterostucture is among the best reported ones in the literature.
Pre-Column Derivatization HPLC Method for Rapid and Sensitive Determination of Free and Total Formaldehyde in Hair Straightening Products Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-14 Mona M. AlShehri, Maha A. AlMeshal
This paper describes development and validation of rapid and sensitive pre-column derivatization HPLC method to determine free and total formaldehyde content in five hair straightening products purchased from the local market. None of these products was labeled to contain formaldehyde and all of them were labeled with specific formaldehyde releasers. The formaldehyde derivative was separated using a µBondapak™ C18 column with mobile phase consisted of acetonitrile: water (70:30, v/v) and detected at 350 nm. The method was linear over the concentration range of 8-80 ng mL-1 (r = 09997) with detection limit of 0.8 ng mL-1. The formaldehyde derivative was stable for 30 days at room temperature. The results showed that all the samples were formaldehyde positive. The concentrations of free and total formaldehyde were 0.015-3.336 g% and 1.462-3.877 g%, respectively. The method showed high precision as the values of relative standard deviations (RSD) did not exceed 2.20%.
An efficient sample preparation method based on dispersive liquid–liquid microextraction associated with back extraction for trace determination of acidic pharmaceuticals Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-14 Mahnaz Ghambarian, Fateme Tajabadi, Yadollah Yamini, Mohammad Behbahani, Hamid Reza Sobhi, Ali Esrafili
Reduction of matrix effect seems to be a great challenge for the development of a practical method in bioanalysis. In this regard, a simple and efficient DLLME procedure along with a back-extraction step (DLLME-BE) was developed for the preconcentration of four common non-steroidal anti-inflammatory drugs (NSAIDs) in various biological fluid samples. Briefly, the analytes of interest were initially transferred into the extraction solvent followed by the back-extraction into an immiscible basic methanol (as an acceptor phase) for further preconcentration and clean-up. The main purpose of the work is reducing the matrix effect and sensitive determination of target molecules in the complex matrices. Following on, the separation and determination of the analytes were carried out using GC-MS (in-port derivatization) and HPLC-DAD instrument. The influential parameters affecting the DLLME-BE method were evaluated in detail and the best extraction conditions were established. Under the optimum conditions, low method detection limits in the range of 0.1 – 1.0 and 0.1 – 6.0 µg L-1 were obtained for GC-MS and HPLC-DAD analysis, respectively. Additionally, fair intra-day precisions of 2.7 – 14.5 and 2.8 – 7.8% as well as inter-day precisions of 3.9 – 14.5 and 3.5 – 8.1% were achieved for the GC-MS and HPLC-DAD analysis, respectively. Finally, the method was successfully applied for the determination of four common NSAIDs in different biological fluid samples.
Benzo[7,8]indolizinoquinoline scaffolds based on Mg(ClO4)2-promoted regiospecific imide reduction and π-cyclisation of N-acyliminium species. Analogues of the topo-1 poison rosettacin and 22-hydroxyacuminatine alkaloids Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-14 Abdulkareem Hamid, Abdelaziz Souizi, Ata Martin Lawson, Mohamed Othman, Alina Ghinet, Benoît Rigo, Adam Daïch
Enhanced accessibility of active sites in hierarchical ZSM-5 zeolite for removal of pharmaceutically active substances: adsorption and microcalorimetric study Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-14 Vladislav Rac, Vesna Rakić, Dušan Stošić, Vladimir Pavlović, Sanja Bosnar, Aline Auroux
The possibility of removal of pharmaceutically active substances, atenolol, diclofenac sodium and salicylic acid, from water solutions using hierarchical form of zeolite ZSM-5 is investigated in this paper. Mesopore formation in ZSM-5 was achieved using alkaline treatment. Zeolitic samples were characterized by X-ray diffraction, low temperature nitrogen adsorption, solid-state 27Al MAS NMR, point of zero charge determination and micricalorimetry - volumetry of ammonia adsorption. Adsorption isotherms of pharmaceutically active substances were obtained and liquid calorimetric experiments were used to evaluate the strength of interactions. The capacitiy for salicylic acid adsorption measured for the mesoporous sample did not significantly differ from the results obtained for the parent ZSM-5. However, in the case of atenolol and diclofenac sodium, mesoporous ZSM-5 exhibited increased adsorption capacities. Calorimetric data revealed higher heats of atenolol adsorption on mesoporous ZSM-5, compared to the parent. Based on similar acidity and surface charge determined for the two samples, our results show that geometry and dimensions of both zeolite pores and adsorbing molecules play a crucial role in the studied adsorption processes and that tailoring ZSM-5 porosity by desilication can be used to expand its applicability in depollution processes.
New and Feasible Method for Total Phosphorus and Sulfur Determination in Dietary Supplements by Ion Chromatography Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-13 Marcia Foster Mesko, Marcelo Guerreiro Crizel, Diogo La Rosa Novo, Carla Andrade Hartwig, Filipe Soares Rondan, Cezar Augusto Bizzi
Polymeric microparticles for modified release of npk in agricultural applications Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-13 Júnior Olair Chagas, José Messias Gomes, Isabela Cristina de Matos Cunha, Nathalie Ferreira Silva de Melo, Leonardo Fernandes Fraceto, Gilmare Antônia da Silva, Fabiana Aparecida Lobo
The aim of this work was to synthesize polymeric microparticles as carriers for nitrogen, phosphorus, and potassium (NPK fertilizer) for agricultural applications, using polyglycerol (PG) to improve the synthesis procedure. Multivariate experimental designs were employed to obtain a satisfactory synthesis. The desirability function identified the best conditions for preparation of the microparticles as being 100.00 mg of poly(ε-caprolactone) (PCL), 825.00 mg of PG, 9.25 mL of chloroform, and 0.9% w/v of polyvinyl alcohol (PVA). This resulted in average encapsulation rates of 94.23% for N, 99.80% for P, and 65.00% for K. The profile of release from the microparticles was according to diffusion following Fick’s Law. These observations confirmed the capacity of the proposed microparticles to sustain a continuous and prolonged release of NPK for the purpose of plant fertilization.
Comparative Study on the Essential Oils of Artemisia judaica and Artemisia herba-alba from Saudi Arabia Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-13 Lamya H. Naser Al-Wahaibi, Adeem Mahmood, Merajuddin Khan, Hamad Z. Alkhathlan
Pectin based nanocomposite membranes as green electrolytes for direct methanol fuel cells Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-12 S. Mohanapriya, G. Rambabu, S.D. Bhat, V. Raj
An improved method to obtain essential oil, flavonols and proanthocyanidins from fresh Cinnamomum japonicum Sieb. leaves using solvent-free microwave-assisted distillation followed by homogenate extraction Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-11 Chunchao Zhao, Xinyu Yang, Hao Tian, Lei Yang
An efficient solvent-free microwave-assisted distillation followed by homogenate extraction method (SFMD-HE) was established to separate the essential oil, non-volatile flavonols and proanthocyanidins from Cinnamomum japonicum Sieb. leaves. In the SFMD-HE technology applied in this work, no excessive water was introduced into the system, which can reduce the loss of flavonols and proanthocyanidins in the subsequent extraction process, avoid the generation of hydrosol and improve essential oil yield. Furthermore, no drying was required, which can reduce the energy consumption. The homogenate process can reduce the production of dust and environmental pollution, meanwhile, avoid the degradation and deterioration of some thermo-sensitive compounds. Through comparison, solvent-free microwave distillation was selected as the optimal method, and the 71% ethanol volume fraction was chosen for homogenate extraction. Based on the yields of essential oil, flavonols and proanthocyanidins, the process parameters (microwave irradiation power and time for essential oil distillation; homogenate time, liquid-solid ratio, and ethanol volume fraction for flavonol and proanthocyanidin extraction) were optimized. Due to the combined effects of these parameters, greater advantages were found for the proposed process compared with traditional methods. Therefore, the proposed technique is a good alternative for distilling essential oil and extracting non-volatile components from edible plants.
Tertiary NiCuZn ferrites for improved humidity sensors: a systematic study Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-11 Constantin Virlan, Florin Tudorache, Aurel Pui
Numerous works on ferrites containing three or more divalent cations offer incomplete data thus failing to offer clear correlations between composition and properties. This study describes the magnetic and electrical behaviour of spinel ferrites containing Ni, Cu and Zn. Samples with the general formula Ni0.nCu0.cZn0.zFe2O4, with all metals varying between 0 and 0.5, were obtained by the co-precipitation method. The structure of the samples was investigated by X-ray diffraction and infrared spectroscopy, confirming the formation of pure spinel ferrites. The lattice parameter calculation and EDX analysis confirm the composition of the samples. The magnetic behaviour of the nanoparticles is, in general, superparamagnetic with few samples that present small coercivity, corresponding to larger crystallite size. The measurements indicate the superparamagnetic size limit to be of about 14 nm, which can be observed for samples with low zinc content. The electrical properties of the nanoparticles vary with the composition with dominant indirect effect through microstructural changes. All samples have a similar behaviour in relation to electrical current frequency, with variations of about one order of magnitude resistivity. The relative permittivity indicates several samples that change behaviour, such as nickel rich samples, that significantly decrease relative permittivity at higher frequencies compared to zinc rich samples with smaller variations. All samples present variations in the presence of water vapour but increased sensitivity towards humidity was observed for nickel rich samples characterized by larger crystallite size and density.
Multi-walled carbon nanotubes modified with iron oxide and silver nanoparticles (MWCNT-Fe3O4/Ag) as a novel adsorbent for determining PAEs in carbonated soft drinks using magnetic SPE-GC/MS method Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-11 Mojtaba Moazzen, Amin Mousavi Khaneghah, Nabi Shariatifar, Mahsa Ahmadloo, Ismail Eş, Abbas Norouzian Baghani, Saeed Yousefinejad, Mahmood Alimohammadi, Ali Azari, Sina Dobaradaran, Noushin Rastkari, Shahrokh Nazmara, Mahdieh Delikhoon, GholamReza Jahed Khaniki
The synthesis of compounds with an excellent adsorption capability plays an essential role to remove contaminants such as phthalic acid esters (PAEs) with potential carcinogenic characteristics from different food products. In this context, for the first time, a novel adsorbent (MWCNT-Fe3O4/Ag) was synthesized by using iron (magnetic agent), and silver (catalytic and surface enhancer agent) to further approach in a magnetic SPE-GC/MS method for determining of PAEs in carbonated soft drink samples. The limit of detection (LOD) and limit of quantification (LOQ) values of MSPE-GC/MS were determined in six PAEs as a range of 10.8-22.5 and 36-75 ng/L, respectively. Also, the calibration curves of PAEs were linear (R2= 0.9981-0.9995) over the concentration level of 10.000 ng/L and the recoveries of the six PAEs were ranging from 96.60% to 109.22% with the RSDs less than 8%. Moreover, scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), X-Ray diffraction (XRD), vibrating sample magnetometry (VSM) and transmission electron microscopy analyses (TEM) were utilized to characterize the produced MWCNT-Fe3O4/Ag. Based on the findings, the surface of MWCNT is relatively uniform, which became coarser after loading with Fe3O4/Ag particles. Also, EDX spectrum showed the carbon (C), iron (Fe), oxygen (O), Ag and copper (Cu) are the main components of synthesized MWCNTs-Fe3O4/Ag. The successful adhesion of Fe3O4/Ag on the texture of MWCNTs using a co-precipitation method was confirmed by XRD and FT-IR assays. Additionally, excellent crystallinity and clear lattice nanocrystals fringes of prepared MWCNT-Fe3O4/Ag was demonstrated by TEM analysis. Based on the obtained VSM images, the prepared sorbent (MWCNT-Fe3O4/Ag) has the good magnetic performance for magnetic separation and extraction processes. It was concluded that the synthesized MWCNT-Fe3O4/Ag could be used as an efficient adsorbent for determining contaminants such as PAEs in different beverage samples.
Cytotoxicity Assay of Plant-Mediated Synthesized Iron Oxide Nanoparticles using Juglans Regia Green Husk Extract Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-10 Zahra Izadiyan, Kamyar Shameli, Mikio Miyake, Hirofumi Hara, Shaza Eva Binti Mohamad, Katayoon Kalantari, Siti Husnaa Mohd Taib, Elisa Rasouli
Synthesis of iron oxide nanoparticles has attracted increasing interest due to their importance in biomedical and technological applications. To investigate the ability of Juglans regia (J. regia) green husk extract in iron oxide nanoparticles size control, they were synthesized through co-precipitation method with J. regia extract and without it. For both tests, other experimental conditions were same. According to High-resolution transmission electron microscopy, the mean diameter and standard deviation of iron oxide nanoparticles and J. regia/ iron oxide nanoparticles synthesized using co-precipitation method were 12.60 ± 2.87 and 5.77 ± 1.66 nm respectively. These results showed that J. regia/ iron oxide nanoparticles synthesized using extract have a smaller size than nanoparticles fabricated by co-precipitation method; moreover, green husk extract plays the main role as size control. The obtained results of Powder X-ray diffraction (PXRD), High resolution transmission electron microscopy (HR-TEM), Field emission scanning electron microscopy (FESEM), and Energy dispersive X-ray (EDX) are in good agreement with each other and confirm the high purity of fabricated magnetic nanoparticles using J. regia extract. Vibrating sample magnetometer (VSM) revealed that the J. regia/ iron oxide nanoparticles due to their proper magnetic properties have high saturation magnetization and low coercivity. According to FTIR spectrum, the J. regia would be coated on the iron oxide nanoparticles surface in a successful manner. The non-toxic effect of J. regia/ iron oxide nanoparticles concentration below 1000 µg/ml was observed in the studies of in vitro cytotoxicity on normal and cancerous cell lines, respectively. The dose-dependent toxicity made it a suitable candidate for various medical applications.
Room-temperature fabrication of magnetite-boehmite sol-gel composites for heavy metal ions removal Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-07 Olga E. Shapovalova, Andrey S. Drozdov, Ekaterina A. Brushkova, Maxim I. Morozov, Vladimir V. Vinogradov
Use of Taguchi approach for synthesis of calcite particles from calcium carbide slag for CO2 fixation by accelerated mineral carbonation Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-06 Mahmut Altiner
This study is focused on the conversion of harmful materials (calcium carbide slag [CCS] and flue gas) into CaCO3 particles through an accelerated mineral carbonation process. The influences of reaction temperature, amount of Na-oleate, solid-to-liquid ratio, and stirring speed on the properties of CaCO3 particles were determined using XRF, XRD, SEM, FTIR, TG, and contact angle measurements. Experiments were designed based on an orthogonal array L9 (34) of the Taguchi approach. The gas mixture of CO2/N2 (16.3% of CO2 cons.) gas was used to represent the flue gas for each experiment. The formation of CaCO3 particles from CCS depending on time was monitored via SEM. Experiments showed that the presence of Na-oleate in the slurry played a curial role in the carbonation process, and the conversion ratio of CO2 into a solid carbonate phase was higher than that in the experiments conducted without Na-oleate. The crystallite size of CaCO3 particles varied between 11.55 and 38.11 nm depending on the production conditions. Each obtained CaCO3 particles were identified as calcite (cubic-like rhombohedral), which is in high demand in many industrial applications.
Synthesis of N'-(Quinazolin-4-yl)isonicotinohydrazides and Their Biological Screening, Docking and ADME Studies Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-06 Kinjal D. Patel, Rajesh H. Vekariya, Neelam P. Prajapati, Dhaval B. Patel, Hitesh D. Patel, Tauhid Shaikh, Dhanji P. Rajani, Smita Rajani, Naumita S. Shah, Devendrasinh Jhala
Direct ICP-OES multielement analysis of infused black and green teas and chemical fractionation of selected essential and non-essential elements prior to evaluation of their bioavailability and classification of teas by pattern recognition Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-06 Pawel Pohl, Anna Szymczycha-Madeja, Maja Welna
Operationally defined chemical fractionation of Al, Ba, Ca, Cu, Fe, Mg, Mn, Ni, Sr and Zn in infusions of loose leaf and bagged black and green teas was carried out. It was based on tandem-column solid phase extraction using reverse-phase and strong cation-exchange extraction tubes connected in series. Concentrations of elements in resultant infusions as well as column effluents and eluates were determined with the aid of inductively coupled plasma optical emission spectrometry and a newly developed simplified sample preparation procedure. It was established that information on separated chemical fractions, particularly the fraction of residual species of elements, had better discrimination power than information about total concentrations of these elements. Differences in chemical fractionation patterns of elements in infusions of analyzed four types of tea led to simple classification of different black and green teas by principal component analysis and linear discriminant analysis.
Plasmonic and fluorescent sensors of metal ions in water based on biogenic gold nanoparticles Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-06 Luisa E. Silva-De Hoyos, Victor Sánchez-Mendieta, Miguel A. Camacho-López, Jésica Trujillo-Reyes, Alfredo R. Vilchis-Nestor
Gold nanoparticles (AuNPs) were synthesized using a rapid, single step, and completely green biosynthetic method employing aqueous Citrus paradisi (grapefruit) extract, which was used as both the reducing and capping agent. Au(III) ions were rapidly reduced by the aqueous grapefruit extract, leading to the formation of highly stable and crystalline colloidal AuNPs, confirmed by the surface plasmon resonance (SPR) peak centered at 544 nm in the UV-Vis spectra. Biogenic AuNPs have been evaluated as plasmonic, fluorescent and naked-eye sensors of Pb2+, Ca2+ Hg2+, Zn2+ and Cu2+ ions in aqueous media, with a good performance and selectivity. Of the three methods used for metal ions sensing, fluorescent sensors shows better results, specifically with Ca2+, Cu2+ and Pb2+. Copper was detected by both plasmonic and fluorescent methods.
Development of Cholesterol Biosensor using Au Nanoparticles Decorated f-MWCNT Covered with Polypyrrole Network Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-05 M. Alagappan, Susan Immanuel, R. Sivasubramanian, A. Kandaswamy
Cholesterol forms the basic structural components in the biological membrane and is present in several nerve tissues, brain and also serves as a source for the preparation of fatty acids. The determination of cholesterol level is significant in clinical diagnosis for heart problems, thrombosis etc. In this work, we report an electrochemical cholesterol biosensor based on cholesterol oxidase (ChOx) enzyme immobilized on gold nanoparticles – functionalized - multiwalled carbon nanotube (MWCNT) - polypyrrole (PPy) nanocomposite modified electrode. The sensor was fabricated by a two-step approach wherein the Au NPs-f-MWCNT was prepared by wet chemical method followed by electropolymerization of pyrrole. PPy act as a support matrix to hold ChOx and the presence of Au-f-MWCNT increases the electrical conductivity. Cyclic voltammetry (CV) exhibits a decrease in current with increasing cholesterol concentration which arises due to the competing action of Triton X100 surfactant employed for the preparation of cholesterol solution. The AuNPs-f-MWCNT-PPy-ChOx/GCE showed a linear response from 2x10-3 to 8x10-3M in amperometry with a sensitivity and detection limit of 10.12 µA mM-1 cm-2 and 0.1x10-3M respectively. Further, the detection of cholesterol using impedance spectroscopy was also demonstrated. The reproducibility, stability and the validity of the sensor in biological samples were also examined.
Synthesis, self-assembly-behavior and biomolecular recognition properties of thyminyl dipeptides Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-05 Giovanni N. Roviello, Giorgia Oliviero, Antonella Di Napoli, Nicola Borbone, Gennaro Piccialli
Highly sensitive pressure sensor based on graphene hybrids Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-02 Mahesh Vaka, Ming Zhe Bian, Nguyen Dang Nam
Study on the properties of FeCrNi/CBN Composite Coating with High Velocity Arc Spraying Arab. J. Chem. (IF 4.553) Pub Date : 2018-03-02 Pan Ding, Jing Song, Xiao-juan Liu, Jing-bo Li, Hui-qin Li, Han-yu Zhao, Jun-yu Duan, You-zhou Jiao
FeCrNi / CBN cored wire is prepared by use of the pull-type flux cored wire machine (FCWM50 type), FeCrNi / CBN composite coating is made by high velocity arc spraying. The special properties of the composite coating can be improved by adding Cr, Ni and small amounts of rare earth elements to adjust the coating composition. The Tribological properties of FeCrNi/CBN composite coating with high velocity arc spraying is studied. Images and components and cross-section microstructure of coatings are analyzed by means of SEM, and EDS etc. This research indicated that FeCrNi/CBN composite coatings have typical layered structure feature and high bond strength and hardness. Friction of coatings at near room temperature or higher has “Run-up” period. With the increase of temperature, friction coefficient of coatings becomes low and wearing capacity of coatings high. The adding of CBN powder highly improved the wearing capacity of coatings.
The Composition of the Essential Oil and Aqueous Distillate of Origanum vulgare L. Growing in Saudi Arabia and Evaluation of Their Antibacterial Activity. Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-27 Merajuddin Khan, Shams T. Khan, Noor A. Khan, Adeem Mahmood, Abdulaziz A. Al-Kedhairy, Hamad Z. Alkhathlan
The essential oil and aqueous distillate composition of Origanum vulgare L. were analyzed by GC/MS. Sixty-seven different components were detected in both oils. Sixty-four components were characterized for the oil derived from the aerial parts, whereas thirty-three components in the volatile oil from the aqueous distillates of O. vulgare L., representing 99.8% and 98.5% of the oils, respectively. The main components of the volatile oil from the aerial parts of O. vulgare L. were carvacrol (70.2 ± 1.37%), γ-terpinene (5.6 ± 0.11%), p-cymene (4.5 ± 0.42%), trans-sabinene hydrate (3.8 ± 0.07%), and thymol (2.2 ± 0.12%). In comparison, the main compounds of the volatile oil of the O. vulgare L. aqueous distillates were carvacrol (92.5 ± 0.97%), thymol (2.5 ± 0.09%), and terpinen-4-ol (1.0 ± 0.03%). The antibacterial activity of both oils, along with that of the purified major component, carvacrol, against Gram-positive and Gram-negative strains was assessed. The results revealed that all three samples showed significant antibacterial activity against all tested strains. The IC50 values of the oils derived from the aerial parts and aqueous distillates of O. vulgare L. against the tested strains was in the range of 107−383 µg.mL-1, whereas, the IC50 value of carvacrol was in the range of 53−151 µg.mL-1. The data suggest that carvacrol, a major component of both oils, possesses the highest antibacterial activity of all the constituents and is the main component responsible for the antibacterial activity of Saudi O. vulgare L. oils.
Quantitative Characterization Appreciation of Golden Citrine Golden by The Irraditionof [Feo4]4- Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-27 Guoying, Zhang Xinyan, Li Xiang, Zhang Ye
With the help of irradiation, [FeO4]4- was excited by one electron from ferric electronic shell, it absorbed the visible light of 550nm, and then made crystal appears golden color which named citrine.27 pieces citrine was confirmed as natural from 32 pieces golden citrine by IR technology, their color parameters were calculated by the colorimeter tests, then how could hue, lightness and chroma contribute to visual color were analyzed too.It reveals that chroma of natural citrines are negatively correlated with hue and lightness, by the control of hue angle on the impact of the chroma, the co-effect of hue and lightness of natural citrine produce moderate influence on chroma. Without the consideration of chroma influence on lightness, lightness and hue angle are high correlated (r=0.924), it is tested the high linear correlation of citrine lightness and hue; while with the consideration of chroma influence on lightness, lightness and hue angle also high correlated (r=0.897), and the high linear correlation of citrine lightness and hue is confirmed. It draws conclusion that in the limit the citrine golden, lightness should be regarded as the first factor when citrine quality evaluation was taken, with the most intuitive representative and most consistent with the expression of perception effect, then the effect of hue and chroma was considered furthermore.
Ultrasensitive determination of ceftizoxime using pencil graphite electrode modified by hollow gold nanoparticles/reduced graphene oxide Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-27 F. Azadmehr, K. Zarei
In this work, a pencil graphite electrode (PGE) was modified using electrochemically reduced graphene oxide (rGO) and then hollow gold nanoparticles (HGNPs) were generated onto rGO/PGE by electrodeposition of cobalt and after that galvanic displacement reaction of cobalt nanoparticles with Au3+ ions. In this way, hollow gold nanoparticles/reduced graphene oxide/pencil graphite electrode (HGNPs/rGO/PGE) was constructed and used for sensitive voltammetric determination of ceftizoxime (CFX). The design experiment as a central composite design (CCD) methodology was developed as the experimental strategy for optimization of the influence of variables on the performance of modified electrode. The modified electrode was characterized using electrochemical impedance spectroscopy (EIS), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and choronocoulometry. The cyclic voltammetry (CV) and adsorptive differential pulse voltammetry (AdDPV) methods were utilized to survey the electrochemical action of CFX on the modified electrode. The linear dynamic range was 1.0×10-12M 1.0 × 10 - 12 M to 1.0×10-11M 1.0 × 10 - 11 M and 1.0×10-11M 1.0 × 10 - 11 M to 1.0×10-9M. 1.0 × 10 - 9 M . with a detection limit of 3.5×10-13 M. The existent method was employed to the determination of CFX in pharmaceutical and biological samples.
Metal Doped Manganese Oxide Octahedral Molecular Sieve Catalysts for Degradation of Diclofenac in The Presence of Peroxymonosulfate Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-27 M.H. Wu, J. Shi, H.P. Deng
Manganese oxide octahedral molecular sieve (OMS-2) and a series of OMS-2 doped with Co, Cu, and Ce were prepared via a solvent-free method, and tested in heterogeneous activation of peroxymonosulfate (PMS) for diclofenac (DCF) degradation in aqueous solutions. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), N2adsorption/desorption isotherms, Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) and X-ray photoelectron spectroscopy (XPS) were used to characterize the properties of those materials. It was found that (Co+Ce)-OMS-2 seemed to be most efficient and had the best adsorption capacity, which may due to most abundant lattice oxygen and more macropore than other materials caused by cerium ions enter into the channel. Results from XPS suggested that the highly catalytic efficiency possible involved the activation of PMS to sulfate and hydroxyl radical meditated by the redox pair of Mn(IV)/Mn(III) and Co(III)/Co(II) in catalysts.
Kinetics and Thermodynamics of NPX Adsorption by γ-FeOOH in Aqueous Media Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-27 Zhanyi Li, Guoguang Liu, Qing Su, Xiaoyu Jin, Xiaoqing Wen, Guojian Zhang, Run Huang
Naproxen (NPX) is a common PPCPs in wastewater treatment plants which is influenced by the coexistence on its photodegradation. Most research on reasons for NPX photodegradation has focused on the soluble substances in water mainly, and the adsorption effect of solid particles is less. The effects of initial concentration, temperature, and pH on the adsorption of NPX on γ-FeOOH were studied. It was found that the equilibrium time of γ-FeOOH adsorbed NPX was 240 min. The increase of initial concentration and temperature were favorable for the adsorption. The optimal adsorption pH was 7.0, and the adsorption capacity attained 28.05 mg•g-1. It was learned, through model fitting, that the adsorption reaction was in accordance with the Laggenren quasi-second-order kinetic model; the internal diffusion process was the control step, where the adsorption was close to the Langmuir isothermal adsorption model. The thermodynamic calculation showed that ΔG <0, ΔH> 0, ΔS> 0, which inferred that the adsorption was a spontaneous, endothermic, and entropy increasing process, which is the common action of chemical bond forces and static electricity.
Capparis decidua Edgew (Forssk.): a comprehensive review of its traditional uses, phytochemistry, pharmacology and nutrapharmaceutical potential Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-27 Sonaina Nazar, Muhammad A. Hussain, Ameer Khan, Gulzar Muhammad, Muhammad Nawaz Tahir
Capparis decidua, a medicinal plant of family Capparaceae grows abundantly in wild arid regions of Asia, Africa and Saudi Arabia. The plant has found wide folk medicinal applications along with its nutritional value. C. decidua possessed many pharmacological attributes such as anti-diabetic, anthelmintic, antibacterial, antifungal, analgesic, anti-nociceptive, anti-rheumatic, hypolipidaemic, antiatherosclerotic, anti-tumor, antigiardial, antioxidant, anti-inflammatory, hepatoprotective, and anticonvulsant activities. These marvellous bioactivities of the caper plant can be attributed to the presence of a wide range of phytochemicals including alkaloids (capparisinine, capparisine, stachydrine, isocodonocarpine), phenolics, flavonoids, sterols and fatty acids. This review focuses on detailed phytochemistry, folk medicinal uses and pharmacological attributes of this multipurpose plant. Moreover, we also covered the importance of plant as a source of functional food and nutrapharmaceuticals.
Comprehensive structural analysis of cis- and trans-tiliroside and quercetrin from Malvastrum coromandelianum and their antioxidant activities Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-22 Shanti Devi, Vineet Kumar
Malvastrum coromandelianum is widely used in traditional system of medicine for the cure of different ailments. In the present study, two compounds were isolated from the methanol extract and were characterized as tiliroside [kaempferol-3-O-β-d-(6″-E-p-coumaryl) glucopyranoside] and quercetrin (quercetin-3-O-α-l-rhamnopyranoside) based on comprehensive NMR, IR and mass spectral analysis. NMR also showed the presence of trans- and cis-isomers of tiliroside in 3.26:1.00 ratio. The change of NMR solvent from CH3OH-d4 to DMSO-d6 and resulting chemical shift values have been analyzed. The in vitro IC50 values against 1, 1-diphenyl-2-picryl-hydrazyl radical (DPPH) for tiliroside, quercetrin and extract was found to be 60.40 ± 0.24, 68.05 ± 0.36 and 71.98 ± 0.29 (in µg/mL ± s.d.), respectively. The ferric ion (Fe+3) reducing ability of ethyl acetate extract, tiliroside, quercetrin and standard ascorbic acid were 1.169 ± 0.006, 0.324 ± 0.012, 1.407 ± 0.008 and 1.167 ± 0.010 respectively with R2 > 0.990 at 50 µg/mL concentration. The results conclude that isolated compounds as well as extract have significant antioxidant activity and can be further developed as potential antioxidants.
Science and Engineering of Superhydrophobic Surfaces: Review of Corrosion Resistance, Chemical and Mechanical Stability Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-17 Gh. Barati Darband, M. Aliofkhazraei, S. Khorsand, S. Sokhanvar, A. Kaboli
Investigations on superhydrophobic surfaces (SHS) are very interesting because of their importance in many applications. One of the major applications of these SHS is to increase the corrosion resistance of surfaces exposed to corrosive environments as well as their long-term chemical stability and maintaining the superhydrophobic characteristics. Deep understanding of how to increase the corrosion resistance by SHS has a significant effect on the development of strategies to improve corrosion resistance and long-term chemical stability of these surfaces. Other important properties that limited the real use of superhydrophobic surfaces are mechanical stability. In this review article, an overview of SHS is provided, and then their fabrication methods discussed. Moreover, the corrosion resistance of these SHS fabricated by various methods and their chemical stability and mechanical stability are reviewed. -In the following, recent strategies for improvement of corrosion resistance, chemical and mechanical stability are reviewed.
Mechanical investigations on piezo-/ferrolectric Maleic Acid-doped Triglycine Sulphate single crystal using Nanoindentation technique Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-12 Abid Hussain, Nidhi Sinha, Abhilash J. Joseph, Sahil Goel, Budhendra Singh, Igor Bdikin, Binay Kumar
The present work reports the growth and characterization of single crystals of pure triglycine sulphate (TGS) and maleic acid doped triglycine sulfate (MA-TGS). Both the crystals were grown by conventional slow evaporation solution technique. The crystal structure, composition and morphology of both pure TGS and MA-TGS crystals were studied using single crystal and powder X-ray diffraction, scanning electron microscope, and CHNS analysis. The results revealed monoclinic crystal system for both the crystals with space group P21. Thermal stability and melting point of the grown crystals was determined by employing thermogravimetric and differential thermal analysis (TG- DTA) technique. The dielectric study showed an increase in Curie temperature along with a decrease in maximum permittivity due to MA doping. Enhanced piezoelectric, ferroelectric and mechanical properties were obtained for the doped crystal. The value of piezoelectric charge coefficient, d22 was estimated from ‘Displacement-Voltage (D-V)’ butterfly curves and was observed to increase from 56.23 pm/V for pure TGS single crystal to 72.02 pm/V for MA-TGS single crystal. An increase in the ferroelectric parameters (spontaneous and remanent polarizations) was observed for doped TGS crystal. Also, the value of true-remanent polarization was determined using remanent hysteresis task for MA-TGS crystal. Mechanical stability of grown crystals was examined using the nanoindentation technique and various parameters such as the hardness, stiffness and Young’s modulus were evaluated. Nanoindentation results revealed that both the crystals have a greater capability to withstand deformation caused by applying various loads. However, the mechanical strength of MA-TGS crystal was observed to be better than that of pure TGS crystal. Comparative structural, ferroelectric, piezoelectric and mechanical studies provide useful scientific information of an important class of TGS crystals.
Catalytic effectiveness of azobisisobutyronitrile/[SiMes)Ru(PPH3)(Ind)Cl2 initiating system in the polymerization of methyl methacrylate and other vinylic monomers Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-09 Abdullah Mohammad Al-Majid, Waseem Sharaf Saeed, Abdel-Basit Mohammed Al-Odayni, Abdulaziz Ali Alghamdi, Taieb Aouak, Fady Nahra, Steven Nolan
The catalytic system of azo-bis-isobutyronitrile (AIBN) combined with (SiMes)Ru(PPH3)(Ind)Cl2 [M20] was investigated for the controlled radical polymerization of methyl methacrylate (MMA) in solution. Various factors that may influence the catalytic polymerization process, such as the aging time of the initiating system, AIBN/M20 ratio, concentration of monomer, polymerization time, temperature, and the nature of solvent were examined. The results showed that the yield, molecular weight, and molecular distribution are practically unaffected by these parameters; however, the syndiotactic stereo-structure tendency that characterizes the produced poly(methyl methacrylate) (PMMA) varied with temperature. The optimum conditions for PMMA synthesis were determined to produce an essentially syndiotactic material with uniformly high molecular weights. It was also revealed that the kinetics of MMA polymerization is of first order with respect to the concentration of monomer. A comparison was also made for some vinylic polymers synthesized either with the AIBN alone or with the AIBN/M20initiating system under the same conditions.
Electrochemical response of n-type bismuth telluride based thermoelectric materials in NaCl solutions: A comparison between a single-phase alloy and a nanocomposite containing MoS2 nano-particles Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-09 Mohsen K. Keshavarz, Arash Fattah-alhosseini
This work presents a systematic assessment of electrochemical responses of n-type bismuth telluride-based thermoelectric materials in NaCl solutions. A single-phase alloy and a nanocomposite (with embedded MoS2 nanoparticles) produced by means of mechanical alloying and hot extrusion were investigated. The polarization and electrochemical impedance spectroscopy tests in NaCl solutions revealed that the passivity of the nanocomposite specimen was considerably improved compared with the coarse-grained single-phase alloy. Mott–Schottky analysis revealed that passive layers of both single-phase alloy and nanocomposite specimens had an n-type semiconducting behavior, and the donor density reduced in the passive layer of the nanocomposite specimen.
Functionalization of π-activated alcohols by trapping carbocations in pure water under smooth conditions ☆ Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-09 Rosa Ortiz, Alessandro Koukouras, Eugenia Marqués-López, Raquel P. Herrera
Acetic acid as catalyst in pure water was found to be an excellent reaction medium for the direct dehydrative functionalization of π-activated alcohols using a wide variety of interesting C-, P-, and S-centered nucleophiles, such as indoles, pyrrole, anilines, 1,3-dicarbonyl compounds, diphenyl phosphite and pyridine-2-thiol. The smooth reaction conditions, along with high yields, short reaction times, clean reaction crudes, an easy product isolation procedure, plus the reusability of the catalyst and the use of no excess of nucleophiles, make this approach an atom economical, green and appealing method to efficiently trap carbocations in pure water, leading to new Csp3–X bonds (X = Csp2, Csp3, P and S).
Removal of Pentachlorophenol pesticide from aqueous solutions using modified chitosan Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-06 Aparajita Shankar, Manasa Kongot, Vipin Kumar Saini, Amit Kumar
Characterization and photocatalytic activity of new photocatalysts based on Ag, F-modified ZnO nanoparticles prepared by thermal shock method Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-06 Huu Thinh Pham Nguyen, Thi Minh Tram Nguyen, Chau Ngoc Hoang, Tien Khoa Le, Torben Lund, Huu Khanh Hung Nguyen, Thi Kieu Xuan Huynh
Ag-modified ZnO, F-modified ZnO and (Ag, F)-modified ZnO nanoparticles were prepared by thermal shock method in order to study the effects of doping agents on their crystal structure, morphology, optical properties, surface structure and photocatalytic activity. The catalysts were characterized by XRD, FE-SEM, TEM, FTIR, UV-Visible diffuse reflectance and XPS spectroscopy. The photocatalytic activity was evaluated via the degradation of methylene blue under UVA and visible light irradiation. According to the results, the thermal shock process with AgNO3 did not modify the morphology but successfully created silver species on the surface of ZnO, which induces the visible light absorption and then increases the photocatalytic activity. The enhanced phototcatalytic performance was also observed in F-modified ZnO sample owing to the increase of surface hydroxyl groups and the formation of zinc vacancies. Among three modified ZnO samples, (Ag, F)-modified ZnO was found to be the best sample with the photocatalytic activity enhanced by the factor of 3 under both UVA and visible light, which may be attributed to the synergic effects of AgNO3 and KF used in thermal shock process.
Self assembly in an aqueous Gemini surfactant containing sugar based (isosorbide) spacer Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-06 Kushan Parikh, Sneha Singh, Sanjeev Kumar
Effect of Immersion Time on Electrochemical and Morphology of New Fe-Co Metal-Metal Glassy Alloys in Acid Rain Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-06 Albandaree K. Al-Harbi, Khadijah M. Emran
Electrochemical behavior of two Metal-Metal glassy alloys Fe78Co9Cr10Mo2Al1 (VX9) and Fe49Co49V2 (VX50) (at.%) were investigated at different immersion times in artificial acid rain at 20°C using electrochemical techniques as electrochemical impedance spectroscopy (EIS) and cyclic polarization (CP). The morphology and composition of alloy surface were investigated using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX) measurements and atomic force microscopy (AFM). VX9 alloy has high corrosion resistance more than VX50 due to good protective elements as Cr 10% that create chromium oxide. Immersion measurements during (0.5-12h) reveal the critical time for VX9 alloy is about 3 hours to begin corrosion resistance while the VX50 alloy take a longer time to form protective film. The susceptibility of studied alloys for localized corrosion was observed by cyclic-polarization data due to passive film of two layers (inner compact and outer prose). The VX50 alloy has low value of charge transfer resistance due to exposure to more pitting attack. The AFM and SEM images found that average surface roughness (Ra) of VX9 alloy is lower than VX50 alloy.
Microwave-assisted synthesis and antibacterial propensity of N’-(s-benzylidene and s-1H-pyrrol-2-yl)methylene)-2-propylquinoline-4-carbohydrazide motifs Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-06 Olayinka O. Ajani, King T. Iyaye, Damilola V. Aderohunmu, Ifedolapo O. Olanrewaju, Markus W. Germann, Shade J. Olorunshola, Babatunde L. Bello
Microwave-assisted approach was utilized as green approach to access a series of 2-propylquinoline-4-carbohydrazide hydrazone derivatives 10a-j of aromatic and heteroaromatic aldehydes in highly encouraging yields. It involved four steps reaction which was initiated with ring opening reaction of isatin in a basified environment and subsequent cross-coupling with pentan-2-one to produce compound 7. Esterification of 7 in acid medium led to the formation of compound 8 which was reacted with hydrazine hydrate to access 9 which upon microwave-assisted condensed with aromatic and heteroaromatic aldehydes furnished the targeted compounds 10a-j. The structures of 10a-j were confirmed by physico-chemical, elemental analyses and spectroscopic characterization which include UV, FT-IR, 1H and 13C NMR as well as DEPT-135. The targeted compounds 10a-j, alongside with gentamicin clinical standard, were investigated for their antibacterial efficacies using agar diffusion method. 2-Propyl-N’-(pyridine-3-ylmethylene) quinoline-4-carbohydrazide 10j emerged as the best antibacterial hydrazide-hydrazone with lowest MIC value of 0.39 ± 0.02 – 1.56 ± 0.02 µg/mL across all the organisms screened.
Revealing anti-diabetic potency of medicinal plants of Meru Betiri National Park, Jember - Indonesia Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-05 Anak Agung Istri Ratnadewi, Lilik Duwi Rahayu, Jainur Rochman, Susilowati, Ari Satia Nugraha, Tri Agus Siswoyo
Eighteen extracts of six medicinal plants of Meru Betiri National Park (Jember, Indonesia) were studied for their anti-diabetic potency as well as their antioxidant activities (DPPH, superoxide anion and hydroxyl radical scavenging). Total phenolic and flavonoid content were also determined. Total phenols and flavonoid content increased with polarity order, from hexane, ethyl acetate to methanol extracts. Similar pattern resulted in antioxidant activity testing. Ethyl acetate extract of Antidesma bunius, methanol extract of Lagerstroemia speciosa and Lunasia amara possessed higher α-amilase inhibition compared to standard inhibitor, acarbose. Moreover, ethyl acetate extract of Antidesma bunius, methnaol extract of Arcangelisia flava, Lagerstroemia speciosa, Lunasia amara and hexane fraction of Merremia mamosa indicated higher α-glucosidase inhibition compared to standard anti-diabetic drug, acarbose. The extracts with higher phenolic and flavonoid content did not always showed higher inhibition activities α-amilase and α-glucosidase. Overall, the six medicinal plants exhibited potent sources for diabetic mellitus medication.
A novel sensitive method for the simultaneous determination of ascorbic acid, dopamine, uric acid and tryptophan using a voltammetric platform based on carbon black nanoballs Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-03 Aysegul Kutluay Baytak, Mehmet Aslanoglu
A sensitive procedure was developed for the simultaneous determination of ascorbic acid (AA), dopamine (DA), uric acid (UA) and tryptophan (TRP) using a composite electrode based on carbon black nanoballs (CBNB) and carbon nanotubes (CNTs). The CBNB/CNTs/GCE presented well-defined voltammetric peaks for AA, DA, UA and TRP. The proposed procedure has also exhibited excellent catalytic activities and achieved large enhancements of the current responses of DA, AA, UA and TRP. Simultaneous determination at CBNB/CNTs/GCE was carried out by means of square wave voltammetry (SWV). Anodic current responses changed linearly with the concentrations in the range of 2.0 × 10−5–4.0 × 10−4 M for AA, 5.0 × 10−8–2.75 × 10−6 M for DA, 1.0 × 10−6–4.5 × 10−5 M for UA and 2.5 × 10−8–4.8 × 10−6 M for TRP. Detection limits obtained at CBNB/CNTs/GCE were 5.71 × 10−6 M for AA, 1.7 × 10−8 M for DA, 4.2 × 10−7 M for UA and 1.1 × 10−8 M for TRP. The composite of CNTs and CBNB provided good reproducibility and excellent selectivity for DA, AA, UA and TRP. The proposed procedure has also applied to pharmaceuticals and food samples with satisfactory results.
Spencertoxin and spencer acid, new phytotoxic derivatives of diacrylic acid and dipyridinbutan-1,4-diol produced by Spencermartinsia viticola, a causal agent of grapevine Botryosphaeria dieback in Australia Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-02 Pierluigi Reveglia, Sandra Savocchia, Regina Billones-Baaijens, Marco Masi, Antonio Evidente
Spencermartinsia viticola is one of the most widespread Botryosphaeriaceae species isolated from grapevines in South Australian and New South Wales vineyards in Australia. A new phytotoxic dispyridine-butane-1,4-diol and a new diacrylic acid derivatives, here named spencertoxin (1) and spencer acid (2), were isolated from the culture filtrates of S. viticola isolate DAR78870 together with p-hydroxybenzaldehyde (3) and 2-(4-hydroxyphenyl) acetic acid (4). Spencertoxin and spencer acid were characterized as 2,3-di(pyridin-3-yl)butane-1,4-diol and (2Z,2'Z)-3,3'-(carbonylbis(oxy))diacrylic acid, respectively, by spectroscopic methods (essentially NMR and HRESIMS). Spencertoxin (1), p-hydroxybenzaldehyde (3) and 2-(4-hydroxyphenyl) acetic acid (4) showed phytotoxicity when the pure compounds were assayed on grapevine leaves of Vitis lambrusca and Vitis vinifera cv. Shiraz.
Solar light-induced photodegradation of chrysene in seawater in the presence of carbon-modified n-TiO2 nanoparticles Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-01 Yasser A. Shaban
Photocatalytic degradation of chrysene in polluted seawater was successfully achieved under illumination of natural sunlight using carbon modified titanium oxide (C-TiO2) nanoparticles. The morphological and structural characteristics of the as-synthesized nanoparticles were investigated by X-ray diffraction (XRD), UV–Vis spectra, scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared (FT-IR), and X-ray photoelectron spectroscopy (XPS). The characterization results confirmed the successful incorporation of carbon into C-TiO2 nanoparticles. As a result of C-modification, a significant enhancement of the photocatalytic degradation efficiency was observed for C-TiO2, compared with pure TiO2. In order to optimize the operating parameters, the impacts of catalyst loading and pH on the photocatalytic degradation of chrysene were investigated. The best degradation rate was obtained at pH 3 and C-TiO2 loading of 1.0 g L−1. The photodegradation of chrysene in seawater by using C-TiO2 was found to follow a pseudo first-order kinetics in terms of the Langmuir-Hinshelwood model.
Novel chitosan/polyvinyl alcohol thin membrane adsorbents modified with detonation nanodiamonds: Preparation, characterization, and adsorption performance Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-01 Vahid Vatanpour, Ehsan Salehi, Nadia Sahebjamee, Mahbubeh Ashrafi
Detonation nanodiamonds (DNDs), for the first time, were utilized to modify chitosan/polyvinyl alcohol (CS/PVA) thin membrane adsorbents. For this purpose, different contents of DNDs, from nil to 1.5 wt%, were embedded in the polymer matrix of the membranes to obtain the optimum content. Static adsorption of Pb(II) on the prepared membrane adsorbents was studied. The fabricated membranes were characterized in terms of morphology and performance using scanning electron microscopy (SEM) micrographs and Fourier transform infrared (FTIR) spectrum analyses. Langmuir and Freundlich isotherms were used to model the equilibrium adsorption. The effects of pH, temperature, and initial metal concentration on the adsorption capacity were investigated. Results showed that adsorption of lead ion is more favorable at pH= 6. Thermodynamic parameters including ΔHo, ΔSo and ΔGo revealed endothermic, entropy-driven and spontaneous nature of the adsorption. Adsorption capacity for Pb(II) increased from 29.5 mgg−1 (for the plain membrane) to 121.3 mgg−1 by the addition of 1.5 wt% DNDs; however, the optimal content was 1 wt% DNDs considering both mechanical stability and adsorption capacity. Results revealed that the ultra-thin CS/PVA membrane adsorbents modified with DNDs are very potential candidates for heavy metal adsorption.
Air pollution control: The evaluation of TerphApm@MWCNTs as a novel heterogeneous sorbent for benzene removal from air by solid phase gas extraction Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-01 Majid Bagheri Hossein Abadi, Hamid Shirkhanloo
Magnetically Actuated Graphene Coated Polyurethane Foam as Potential Sorbent for Oils and Organics Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-02 M. Anju, N.K.Renuka
Herein, we present Graphene- meso Iron Oxide composite incorporated Polyurethane foam (GPUF) as an elite sorbent for organic contaminants and oils. Anchoring Graphene-meso Iron Oxide composite switches Polyurethane foam to a super hydrophobic and super oleophilic moiety. Detailed structural, microscopic and wettability studies point the cooperative effect of the 3D porous polyurethane scaffold and the effect of Graphene-mesoporous Iron oxide composite on the adsorption dynamics. Benefitting from the hierarchical porous structure and heterogeneity, the as-fabricated sponge manifested superior selective adsorption capacity for a wide variety of oils and organic pollutants in the range 90-316 gg-1. Application of GPUF was demonstrated by the quick and selective removal of oils from water under magnetic field. In addition to this, the adsorbate can be released after sorption by simple squeezing without any deterioration in structure and performance, underlining the recyclability of the sorbent for over 150 cycles. Moreover, GPUF manifests appealing adsorption capacity in complex environments also. The results of the study promise a novel sorbent which can be easily scaled up for large scale treatment of oil spills.
Optimisation of the removal conditions for heavy metals from water: a comparison between steel furnace slag and CeO2 nanoparticles Arab. J. Chem. (IF 4.553) Pub Date : 2018-02-02 B.M. Mercado-Borrayo, Rebeca Contreras, Antoni Sánchez, Xavier Font, R. Schouwenaars, R.M. Ramírez-Zamora
This work studies an innovative approach to water treatment by using recycled electric induction furnace slag for the removal of Cd, Cr and Pb-ions and comparing the results to a treatment with specifically developed CeO2 nanoparticles. The slag was characterised by X-ray Fluorescence, X-Ray diffraction and SEM. The effects of initial ion concentration and adsorbent dose were investigated according to an experimental design. Adsorption tests were carried out with ion solutions present in concentrations ranging from 1 to 10 mg/L and adsorbent doses from 0.064 to 0.64 g/L. The removal mechanism for CeO2 is adsorption. For slag, literature proposes a mechanism involving chemical adsorption of Cd2+, Cr6+ and Pb2+ by silanol and aluminol groups; precipitation in the form of metal silicates formed between the cations and silicic acid leached from the slag provides an alternative explanation. The removal efficiencies with nanoparticles are higher than reported for any other adsorbent (including slag) under all test combinations for the three metals investigated. The maximum removal efficiency with slag was 74% for Cr6+, 64% for Cd2+ and 34% for Pb2+, comparable to, or higher than, other materials reported in literature. The treatment with slag has clear promises in terms of economy and scalability.
CHOLINE CHLORIDE DERIVATIVE-BASED DEEP EUTECTIC LIQUIDS AS NOVEL GREEN ALTERNATIVE SOLVENTS FOR EXTRACTION OF PHENOLIC COMPOUNDS FROM OLIVE LEAF Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-31 M.E. Alañón, M. Ivanović, A.M. Gómez-Caravaca, D. Arráez-Román, A. Segura-Carretero
In the presented study, a new methodology based on the use of deep eutectic solvents (DESs) and microwave-assisted extraction (MAE) and subsequent analysis by HPLC-DAD-ESI-TOF-MS was proposed for the extraction of phenolic compounds from olive leaf. Nine different DESs, using choline chloride as hydrogen bond acceptor in combination with different hydrogen bond donors (four polyalcohols, three organic acids, one sugar and urea), were firstly scanned. A total of 48 phenolic compounds were identified in the olive leaf using HPLC-DAD-ESI-TOF-MS. Experimental results and multivariate data analysis pointed to choline chloride-ethyleneglycol as being the most effective within the tested DESs, showing extraction yields similar to those exhibited by conventional solvents. A Box-Behnken Design and response surface methodology were applied with the aim to optimize the main parameters involved in the extraction process. The optimal extraction conditions were 79.6 °C of temperature, 43.3% of water and 16.7 min of irradiation time. Correlation coefficients (R2 > 0.98) indicated a good relationship between experimental data and the fitted quadratic term models. Results indicated that DESs could be a sustainable alternative to traditional solvents for the extraction of bioactive compounds among many other applications.
Efficient reduction of Cr(VI) under visible light irradiation using CuS nanostructures Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-17 Sawsen Nezar, Yacine Cherifi, Alexandre Barras, Ahmed Addad, Elhadj Dogheche, Nadia Saoula, Nadia Aïcha Laoufi, Pascal Roussel, Sabine Szunerits, Rabah Boukherroub
Photoreduction of hexavalent chromium, Cr(VI), identified as carcinogenic and mutagenic element, to Cr(III), believed to be an essential element, using copper sulfide nanostructures (CuS NSs) as photocatalyst was investigated under visible light irradiation (λ>420 nm). The CuS NSs were synthesized at low temperature using a wet chemical route and fully characterized using various techniques such as scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy and UV-vis spectrophotometry. The photocatalytic reduction of Cr(VI) using visible light irradiation was assessed by UV-vis by following the decrease of the characteristic absorbance at ∼352 nm in the presence of CuS NSs. While CuS NSs promoted Cr(VI) full reduction within 60 min, addition of adipic acid or formic acid accelerated significantly the photocatalytic reduction process. Under optimized conditions, CuS NSs rapidly (12 min) reduced Cr(VI) in presence of 0.5 mM adipic acid. Similarly, Cu NSs were found to be efficient for Cr(VI) reduction dissolved in water from a local lake. Stability studies showed that the photocatalyst could be recycled up to three times without any apparent decrease of its catalytic performance.
In vitro antioxidant actions of sulfur-containing amino acids Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-09 Ji-Han Kim, Hyun-Joo Jang, Won-Young Cho, Su-Jung Yeon, Chi-Ho Lee
Polydopamine-functionalized graphene nanoplatelet smart conducting electrode for biosensing applications Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-09 Prosper Kanyong, Francis D. Krampa, Yaw Aniweh, Gordon A. Awandare
A label-free colorimetric sensor based on silver nanoparticles directed to hydrogen peroxide and glucose Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-07 Nghia Duc Nguyen, Tuan Van Nguyen, Anh Duc Chu, Hoang Vinh Tran, Luyen Thi Tran, Chinh Dang Huynh
Carboxymethylagarose-based multifunctional hydrogel with super stretchable, self-healable having film and fiber forming properties Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-05 Jai Prakash Chaudhary, Faisal Kholiya, Nilesh Vadodariya, Vimal M. Budheliya, Azaz Gogda, Ramavatar Meena
In this work, we repot a super stretchable and quick self-healable composite hydrogels with film and fiber forming properties through introducing hydrogen and covalent bonding. Herein, carboxymethylagarose (CMA) and polyvinyl alcohol (PVA) acts as physical crosslinkers. Boric acid (BA) prompt the formation of crosslinking through hydrogen bonding with blend polymers followed by strong ionic bonding between hydroxyl (-OH) groups of PVA and borate ions of BA. Hydrogel obtained under optimum conditions shows excellent stretching (> 100 times), quick self-healing (< 1 Sec), notches insensitive stretching, fiber and film forming ability. Such integrated properties for a hydrogel system have been achieved using seaweed derived polymer for the first time. In summary, this study opens up a new possibility to design and assemble multifunctional hydrogels using abundant seaweed derived polysaccharides with outstanding stretching, healing plus other properties by simple crosslinking chemistry.
Preparation and Application of Magnetic Zinc Pyridinedicarboxylic Acid Nanocomposite (Zn-(PDC)2@Fe3O4) Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-03 Shuai Zhang, Shoulian Wei, Hao Cheng, Wei Li
Nano-scaled Fe3O4 were synthesized using solvothermal synthesis, and amino-modification of nano-scaled Fe3O4 was conducted with APTES. With Fe3O4-NH2 and Zn2+ as the metal centers, 2,6-pyridinedicarboxylic acids as the organic ligand, and using the one-step ultrasonic-assisted method, a new magnetic zinc pyridinedicarboxylic acid nanocomposite (Zn-(PDC)2@Fe3O4) was synthesized. The structure, composition and morphology of the products were characterized using methods such as X-ray single crystal diffraction, Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction, and scanning electron microscope. The results showed that the Zn-(PDC)2 was almost an octahedron, and the Zn-(PDC)2@Fe3O4 looked like a nanoflower. The mimetic peroxidase properties of Zn-(PDC)2@Fe3O4 were studied with H2O2 solution and TMB solution as the substrates, and the results showed that: the Michaelis constant of H2O2 by Zn-(PDC)2@Fe3O4 was: Km = 0.411 mM, the maximum reaction rate: vmax = 3.440×10-8 M·s-1; the Michaelis constant of TMB by Zn-(PDC)2@Fe3O4 was: Km = 0.189 mM, and the maximum reaction rate: vmax = 2.419×10-8 M·s-1, both of which were lower than those of H2O2 and TMB by Fe3O4 and Horseradish Peroxidase (HRP). Based on the reduction of the absorbance of original solution due to the consumption of H2O2 in oxidation-reduction reaction between SO32- and H2O2 under acid conditions, a new method for determining the content of SO32- was established. The linear range of SO32- was 8×10-7∼8×10-5 mol/L, the detection limit of SO32- was 8×10-8 mol/L, and the RSD of SO32- was 2.7∼9.2%.
In-Situ Synthesis of CuO Nanoparticles in P(NIPAM-co-AAA) Microgel, Structural Characterization, Catalytic and Biological Applications Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-02 Jahanzeb Khan, Muhammad Siddiq, Bilal Akram, Muhammad Aqeel Ashraf
The production of new multi-responsive poly(N-isopropylacrylamide-allyl acetic acid) [P(NIPAM-AAA)] copolymer microgel by free radical emulsion polymerization is reported. Inside this copolymer microgel CuO nanoparticles were generated by in situ reduction of copper nitrate followed by the air oxidation process, their fabrication is confirmed by powdered X-ray diffraction analysis and the average size of CuO NPs was found to be 24 nm having monoclinic shapes. By using dynamic laser light scattering the swelling & de-swelling behaviour of the pure microgel was examined at different temperature and pH values. The copolymer microgel becomes unstable at low pH as well as at high temperature values respectively.UV-visible spectra show a red shift in surface plasmon resonance λSPR of CuO nanoparticles. The catalytic property of hybrid microgel was inspected by observing the reduction of 4-nitrophenol into 4-aminophenol in the presence of excess NaBH4 with various concentrations of catalyst at room temperature. The hybrid microgels also have good anti-bacterial activity against both Gram-positive (C.Albicans) and Gram-negative (E. coli) bacteria.
Molecules and Functions of Rosewood: Pterocarpus cambodianus Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-02 Lou Junwei, Chen Juntao, Ni Changyu, Wanxi peng
Pterocarpus is a high-end, expensive furniture materials collectively. Pterocarpus products have a certain human health function. In this paper, Pterocarpus cambodianus Pierre as an example, we study its human health components by using PY-GC-MS, TDS-GC-MS and GC-MS. The composition of known human health functions was studied by reviewing the literature. 1-Heptatriacotanol has anti-hypercholesterolemic effects. Cryptomeridiol is a natural product of anti-Alzheimer's disease and antispasmodic nature, and has a significant medicinal value. 7-Methyl-Z-tetradecen-1-ol acetate has the effect of heat and heat cough. .alpha.-Bisabolol can be used to treat leishmaniasis caused by Lactobacillus infants.
Electrocatalytic urea mineralization in aqueous alkaline medium using NiIIcyclam-modified nanoparticulate TiO2 anodes and its relationship with the simultaneous electrogeneration of H2 on Pt counterelectrodes Arab. J. Chem. (IF 4.553) Pub Date : 2018-01-02 S. Murcio-Hernández, A.V. Rueda-Solorio, J.A. Banda-Alemán, C. González-Nava, F.J. Rodríguez, E. Bustos, F. Espejel-Ayala, A. Rodríguez, S. Sepúlveda, J. Manríquez
Systematic Characterization of Volatile Organic Components and Pyrolyzates from Camellia oleifera Seed Cake for Developing High Value-added Products Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-31 Lili Liu, Xuexiang Cheng, Linzuo Teng, Yunhao Wang, Xiang Dong, Lili Chen, Dangquan Zhang, Wanxi Peng
Camellia oleiferaseed cake (COSC), a byproduct during oil production of C. oleiferaseeds, has been extremely abundant. However, due to the lack of systematic and in-depth analysis about the chemical composition of COSC, it is difficult to develop high value-added products, resulting in low processing efficiency or even directly abandoned. In this paper, the VOCs (Volatile organic components) characteristics of COSC and the variation rule of COSC groups before/after extraction were revealed, and the thermal loss law of COSC and the pyrolyzates characteristics at different temperatures were also explained. The main VOCs of ethanol extractive of COSC are alcohols, those of petroleum ether extractive are alkanes and organic acids, and those of benzene/ethanol extractive are esters. It is first reported here that rich 1,6,10-Dodecatrien-3-ol,3,7,11-trimethyl-, (E)-, namely nerolidol with wide use in cosmetics and biomedicine, exists in COSC extractives. In addition, bioactive VOCs such as β-caryophyllene, humulene and (E)-Atlantone were observed in three COSC extractives. The total content trend from high to low is petroleum ether extractive, ethanol extractive, benzene/ethanol extractive, indicating that petroleum ether extractive has the best developing prospects. The analytic results of FTIR further confirm that: (1) the COSC contains components including Si compounds, ethers, organic acids, esters and alcohols, (2) the four kinds of organic silicon detected are naturally occurring components in COSC, and (3) organic solvent extraction does not make compound groups of COSC significantly changed. There are four obvious stages in thermogravimetry treatment of COSC: the first (30°C-100°C), the second (180°C-240°C), the third (240°C-400°C), and the fourth (400°C-567°C), and the order of the mass loss is the third, the second, the fourth and the first. During thermogravimetry treatment, three critical turning points of temperature (240°C, 400°C and 567°C) were observed, accompanied by significantly chemical changes such as macromolecule pyrolyzed into small volatile molecules. The four COSC extractive pyrolyzates at 300°C, 450°C, 600°C and 750°C have different content variation in the components, such as heterocyclic type with a high-low-high-low change, hydrocarbons and acids shown by the high-low-low-high process, and ketone and the alcohol with a low-high-low-high change. The 450°C pyrolyzates of COSC residue after extraction are heterocyclic, ketone, phenolic more than esters, hydrocarbons, phosphide, acids, aldehydes, alcohols and acyl; the 600°C pyrolyzates are heterocyclic, ketone, phenolic more than esters, ammonium, phosphide, acid, aldehydes and alcohols. Here, a large number of new components are produced in the pyrolysis treatment for COSC extractive and residue, providing a new approach for the high-grade application of COSC.
Molecules and Functions of Rosewood: Dalbergia stevenson Arab. J. Chem. (IF 4.553) Pub Date : 2017-12-29 Shuai Cheng Jiang, Sheng Bo Ge, Mu Zi Wang, Wanxi Peng
In this paper, the organic solvent extract was analyzed by Fourier transform infrared spectroscopy (FT-IR) and gas chromatography-mass spectrometry (GC-MS), TG, Py-GC-MS and TD-GC-MS were used to analyze the Dalbergiastevenson. And then, the pyrolysis products were analyzed by GC-MS. The chromatographic peak area normalization method was used to calculate the groups The relative content of the points. The results show that there are many kinds of bioactive ingredients in the berzolis sandalwood extract, mainly some alcohols and phenolic compounds. And in bio-energy, bio-medicine, cosmetics, skin care products and spices and other fields have potential application prospects.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
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