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https://www.readbyqxmd.com/read/28231542/in-vitro-biocompatibility-and-proliferative-effects-of-polar-and-non-polar-extracts-of-cucurbita-ficifolia-on-human-mesenchymal-stem-cells
#1
Balakrishnan Aristatile, Ghedeir M Alshammari
Cucurbita ficifolia (C. ficifolia) has been traditionally known for its medicinal properties as an antioxidant, anti-diabetic and anti-inflammatory agent. However, there has been an enduring attention towards the identification of unique method, to isolate the natural components for therapeutic applications. Our study focuses on different polar and non-polar solvents (methanol, hexane and chloroform) to extract the bioactive components from C. ficifolia (pumpkin) and to study the biocompatibility and cytotoxicity effects on human bone marrow-mesenchymal stem cells (hBM-MSCs)...
February 20, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28231529/new-enantioselective-lc-method-development-and-validation-for-the-assay-of-modafinil
#2
Marianna Harvanová, Taťána Gondová
For the first time, a new, fast and sensitive chromatographic method for the separation and determination of modafinil enantiomers was developed on chiral stationary phase with macrocyclic glycopeptide teicoplanin in the polar organic mode. The effect of the mobile phase composition and column temperature on the retention and enantioseparation were studied. The separation was performed using a Chirobiotic T column (250×4.6mm, 5μm) with methanol and triethylamine (100/0.05, v/v) as the mobile phase at a flow rate of 1...
February 16, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28231162/phenolic-pro%C3%AF-le-and-antioxidant-activity-of-melon-cucumis-melo-l-seeds-from-pakistan
#3
Alam Zeb
Phenolic composition of different extracts of honeydew melon seeds and their antioxidant activity was determined for the first time. Phenolic compounds were identified using a reversed phase high performance liquid chromatography with diode array detection (HPLC-DAD) method. Results showed the identification of five phenolic compounds in water extract namely gallic acid and its derivative, hydroxybenzoic acid and catechin derivatives and caffeic acid.There were nine phenolic compounds identified in methanol-water extract, which are caffeic acid, two vanillic acid derivatives, ellagitanins, quercetin-3-rutinoside, derivatives of syringic acid and ellagic acid...
October 17, 2016: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28230995/synthesis-of-high-quality-biodiesel-using-feedstock-and-catalyst-derived-from-fish-wastes
#4
Devarapaga Madhu, Rajan Arora, Shalini Sahani, Veena Singh, Yogesh Chandra Sharma
A low cost and high purity calcium oxide (CaO) was prepared from waste crab shells which were extracted from the dead crabs, used as efficient solid base catalyst in the synthesis of biodiesel. Raw fish oil was extracted from the waste parts of fish through mechanical expeller followed by solvent extraction. Physical as well as chemical properties of raw fish oil were studied and FFA's composition was analysed with GC-MS. Stable and high purity calcium oxide (CaO) was obtained when the material was calcined at 800 °C for 4 h...
February 23, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28230885/zwitterionic-indenylammonium-with-carbon-centred-reactivity-towards-reversible-co2-binding-and-catalytic-reduction
#5
Yanxin Yang, Linfan Yan, Qinyu Xie, Qiuming Liang, Datong Song
We report the synthesis and characterization of a zwitterionic indenylammonium compound and its carbon-centred reactivity towards reversible CO2 binding at ambient temperature through its formal insertion into a C-H bond as well as the catalytic hydroboration of CO2 to methanol derivatives.
February 23, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28230803/one-pot-conversion-of-epoxidized-soybean-oil-eso-into-soy-based-polyurethanes-by-mocl%C3%A2-o%C3%A2-catalysis
#6
Vincenzo Pantone, Cosimo Annese, Caterina Fusco, Paola Fini, Angelo Nacci, Antonella Russo, Lucia D'Accolti
An innovative and eco-friendly one-pot synthesis of bio-based polyurethanes is proposed via the epoxy-ring opening of epoxidized soybean oil (ESO) with methanol, followed by the reaction of methoxy bio-polyols intermediates with 2,6-tolyl-diisocyanate (TDI). Both synthetic steps, methanolysis and polyurethane linkage formation, are promoted by a unique catalyst, molybdenum(VI) dichloride dioxide (MoCl₂O₂), which makes this procedure an efficient, cost-effective, and environmentally safer method amenable to industrial scale-up...
February 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28229903/acute-and-subchronic-toxicity-studies-of-methanol-extract-of-polygonum-minus-leaves-in-sprague-dawley-rats
#7
Parayil Varghese Christapher, Subramani Parasuraman, Mohd Zaini Asmawi, Vikneswaran Murugaiyah
Medicinal plant preparations may contain high levels of toxic chemical constituents to potentially cause serious harm to animals and/or humans. Thus, toxicity studies are important to assess the toxic effects of plant derived products. Polygonum minus is used traditionally for different ailments in Southeast Asia. This study was conducted to establish the acute and subchronic toxicity profile of the methanol extract of P. minus leaves. The acute toxicity study showed that the methanol extract of P. minus is safe even at the highest dose tested of 2000 mg/kg in female Sprague Dawley rats...
February 13, 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/28229154/reactions-of-water-and-c1-molecules-on-carbide-and-metal-modified-carbide-surfaces
#8
REVIEW
Weiming Wan, Brian M Tackett, Jingguang G Chen
The formation of carbides can significantly modify the physical and chemical properties of the parent metals. In the current review, we summarize the general trends in the reactions of water and C1 molecules over transition metal carbide (TMC) and metal-modified TMC surfaces and thin films. Although the primary focus of the current review is on the theoretical and experimental studies of reactions of C1 molecules (CO, CO2, CH3OH, etc.), the reactions of water will also be reviewed because water plays an important role in many of the C1 transformation reactions...
February 23, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28228762/chronic-drought-decreases-anabolic-and-catabolic-bvoc-emissions-of-quercus-pubescens-in-a-mediterranean-forest
#9
Amélie Saunier, Elena Ormeño, Henri Wortham, Brice Temime-Roussel, Caroline Lecareux, Christophe Boissard, Catherine Fernandez
Biogenic volatile organic compounds (BVOC) emitted by plants can originate from both anabolism (metabolite production through anabolic processes) and catabolism (metabolite degradation by oxidative reactions). Drought can favor leaf oxidation by increasing the oxidative pressure in plant cells. Thus, under the precipitation decline predicted for the Mediterranean region, it can be expected both strong oxidation of anabolic BVOC within leaves and, as a result, enhanced catabolic BVOC emissions. Using an experimental rain exclusion device in a natural forest, we compared the seasonal course of the emissions of the main anabolic BVOC released by Q...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28228328/techno-economic-assessment-of-catalytic-gasification-of-biomass-powders-for-methanol-production
#10
Lara Carvalho, Erik Furusjö, Kawnish Kirtania, Elisabeth Wetterlund, Joakim Lundgren, Marie Anheden, Jens Wolf
This study evaluated the techno-economic performance and potential benefits of methanol production through catalytic gasification of forest residues and lignin. The results showed that while catalytic gasification enables increased cold gas efficiencies and methanol yields compared to non-catalytic gasification, the additional pre-treatment energy and loss of electricity production result in small or no system efficiency improvements. The resulting required methanol selling prices (90-130€/MWh) are comparable with production costs for other biofuels...
February 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28228039/cell-quintupling-structural-phase-transition-in-a-molecular-crystal-bis-trans-4-butylcyclohexyl-methanol
#11
Kazuya Saito, Takaaki Ikeda, Yasuhisa Yamamura, Hideki Saitoh, Mafumi Hishida, Yutaro Kobayashi, Takeshi Fujita, Junji Ichikawa
A structural phase transition at 151.6 K of the title compound [bis(trans-4-butylcyclohexyl)methanol] is examined by X-ray diffraction crystallography, Fourier-transform infrared spectroscopy, and adiabatic calorimetry. A general consideration on possible superstructures indicates that a single modulation wave is sufficient to drive this cell-quintupling transition. The entropy of transition determined calorimetrically indicates that two conformations are dominant in the room-temperature phase in contrast to the fivefold disorder expected from the structure of the low-temperature phase...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28226267/a-simple-lc-ms-ms-method-for-the-simultaneous-quantification-of-resveratrol-and-its-major-phase-ii-metabolites-assessment-of-their-urinary-and-biliary-excretions-in-rats
#12
Zhixia Qiu, Jiaojiao Yu, Yu Dai, Xijing Chen, Fang Huang, Ning Li
Trans-resveratrol (Res) is rapidly metabolized, extensively distributed into various tissues and mainly excreted by urine. The present study aimed to establish a simple LC-MS/MS method to simultaneously quantify Res and its major phase II metabolites (Res-3-O-β-d-glucuronide, R3G; Res-4'-O-β-d-glucuronide, R4'G; Res-resveratrol 3-sulfate, R3S; and Res-4'-sulfate, R4'S), and apply this method to assess their urinary and biliary excretions in rats. A simplified salting-out assisted liquid-liquid extraction (SALLE) strategy was developed to prepare samples with acetonitrile-methanol mixture (8:2, v/v) as extractant and ammonium acetate solution (10M) as salting-out reagent...
February 14, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28226182/effect-of-different-solvents-on-the-measurement-of-phenolics-and-the-antioxidant-activity-of-mulberry-morus-atropurpurea-roxb-with-accelerated-solvent-extraction
#13
Jiufang Yang, XiaoQun Ou, Xiaoxu Zhang, ZiYing Zhou, LiYan Ma
The effects of 9 different solvents on the measurement of the total phenolics and antioxidant activities of mulberry fruits were studied using accelerated solvent extraction (ASE). Sixteen to 22 types of phenolics (flavonols, flavan-3-ols, flavanol, hydroxycinnamic acids, hydroxybenzoic acids, and stilbenes) from different mulberry extracts were characterized and quantified using HPLC-MS/MS. The principal component analysis (PCA) was used to determine the suitable solvents to distinguish between different classes of phenolics...
February 22, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28225562/the-adipokinetic-hormone-of-mantodea-in-comparison-to-other-dictyoptera
#14
Gerd Gäde, Heather G Marco
Six species of the order Mantodea (praying mantises) are investigated for the presence and sequence of putative adipokinetic hormones (AKHs). The selected species span a wide evolutionary range of various families and subfamilies of the clade Mantodea. The corpora cardiaca of the different species are dissected, methanolic extracts prepared, peptides separated by liquid chromatography, and AKHs detected and sequenced by ion trap mass spectrometry. All six species investigated contain an octapeptide with the primary structure pGlu-Val-Asn-Phe-Thr-Pro-Asn-Trp amide, which is code-named Emppe-AKH and had been found earlier in three other species of Mantodea...
February 22, 2017: Archives of Insect Biochemistry and Physiology
https://www.readbyqxmd.com/read/28225254/insights-into-free-volume-variations-across-ion-exchange-membranes-upon-mixed-solvents-uptake-by-small-and-ultra-small-angle-neutron-scattering
#15
Francois-Marie Allioux, Christopher J Garvey, Christine Rehm, Blaise L Tardy, Raymond Riley Dagastine, Peter D Hodgson, Lingxue Kong, Ludovic Francis Dumée
Ion-exchange membranes are composite separation materials increasingly used in a variety of electro-membranes and electro-chemical processes. Although promising for solvent reclamation, to date, their main applications are limited to aqueous environments due to physico-chemical and microstructural changes of the materials upon exposure to non-aqueous and mixed solvents solutions, affecting long term stability and separation performance. In the present work, the structural changes of commercial and novel hybrid ion-exchange membranes in mixed methanol/water and ethanol/water solutions are assessed for the first time using ultra-and small-angle neutron scattering techniques...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28225129/one-pot-conversion-of-biomass-derived-xylose-and-furfural-into-levulinate-esters-via-acid-catalysis
#16
Xun Hu, Shengjuan Jiang, Liping Wu, Shuai Wang, Chun-Zhu Li
Direct conversion of biomass-derived xylose and furfural into levulinic acid, a platform molecule, via acid-catalysis has been accomplished for the first time in dimethoxymethane/methanol. Dimethoxymethane acted as an electrophile to transform furfural into 5-hydroxymethylfurfural (HMF). Methanol suppressed both the polymerisation of the sugars/furans and the Aldol condensation of levulinic acid/ester.
February 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28224247/a-simplified-lc-ms-ms-method-for-rapid-determination-of-cycloserine-in-small-volume-human-plasma-using-protein-precipitation-coupled-with-dilution-techniques-to-overcome-matrix-effects-and-its-application-to-a-pharmacokinetic-study
#17
Zhengsheng Mao, Xin Wang, Bingxin Li, Jing Jin, Ming Xu, Youping Liu, Xin Di
Matrix effects have been a major concern when developing LC-MS/MS methods for quantitative bioanalysis of cycloserine. Sample handling procedures including solid phase extraction or derivatization have been reported previously by researchers to overcome matrix effects of cycloserine. In the present study, the possibility of reducing matrix effects of cycloserine using protein precipitation coupled with dilution techniques was investigated. Plasma samples were pretreated by protein precipitation with methanol followed by a 40-fold dilution with methanol-water (50:50, v/v)...
February 21, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28224018/2-benzyl-benzofurans-from-the-tubers-of-ophiopogon-japonicus
#18
Nguyen Hai Dang, Nguyen Dinh Chung, Ha Manh Tuan, Nguyen Van Thanh, Nguyen Tuan Hiep, Dongho Lee, Nguyen Tien Dat
BACKGROUND: The overproduction of nitric oxide (NO) is known to involve in various inflammatory processes. A methanol extract of the tubers of Ophiopogon japonicus was found to strongly inhibit NO production. The present paper deals with the isolation, structural identification and NO inhibitory effect of five compounds isolated from the MeOH extract of O. japonicus tubers. RESULTS: Three new compounds were elucidated to be (2R)-(4-methoxybenzyl)-5,7-dimethyl-6-hydroxyl-2,3-dihydrobenzofuran (1), 2-(2-hydroxyl-4-methoxy-benzyl)-5-methyl-6-methoxyl-2,3-dihydrobenzofuran (2), and 2-(4-hydroxy-benzyl)-5,6-dihydroxybenzofuran (3)...
2017: Chemistry Central Journal
https://www.readbyqxmd.com/read/28223873/development-and-validation-of-bioanalytical-uhplc-uv-method-for-simultaneous-analysis-of-unchanged-fenofibrate-and-its-metabolite-fenofibric-acid-in-rat-plasma-application-to-pharmacokinetics
#19
Rayan G Alamri, Kazi Mohsin, Ajaz Ahmad, Mohammad Raish, Fars K Alanazi
A simple, precise, selective and fast ultra-high performance liquid chromatography (UHPLC-UV) method has been developed and validated for the simultaneous determination of a lipid regulating agent fenofibrate and its metabolite fenofibric acid in rat plasma. The chromatographic separation was carried out on a reversed-phase Acquity® BEH C18 column using methanol-water (65:35, v/v) as the mobile phase. The isocratic flow was 0.3 ml/min with rapid run time of 2.5 min and UV detection was at 284 nm. The method was validated over a concentration range of 100-10000 ng/ml (r(2) ⩾ 0...
January 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28223870/bioactivity-and-chemical-characterization-of-acalypha-fruticosa-forssk-growing-in-saudi-arabia
#20
Ghada Ahmed Fawzy, Areej Mohammad Al-Taweel, Shagufta Perveen, Shabana Iqrar Khan, Fatma Abdulaziz Al-Omary
Acalypha is an important genus of the Euphorbiaceae family. The genus is represented by five species in Saudi Arabia. Acalypha fruticosa Forssk. Fl. Aeg is traditionally used as a cure for stomachache, dyspepsia, rheumatism, dermatitis, and swellings of the body. The present study endeavors to provide a phytochemical and biological evaluation of the plant, with the aim of relating activity to constituting secondary metabolites in the plant. Column chromatographic separation of the methanol extract led to the isolation of four compounds namely 2-methyl-5,7-dihydroxychromone 5-O-β-d-glucopyranoside 1, acalyphin 2, apigenin 3 and kaempferol 3-O-rutinoside 4...
January 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
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