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Chemistry Central Journal

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https://www.readbyqxmd.com/read/27853483/hydrotalcite-quinolinate-composites-as-catalysts-in-a-coupling-reaction
#1
Eloisa Ríos, Magali Hernández, Ilich A Ibarra, Ariel Guzmán, Enrique Lima
Samples of layered double hydroxides were prepared by a sol-gel procedure. Quinolinate Al(C9H6NO)3 units were added during the synthesis, leading to composite quinolinate hydrotalcite-like compounds. The amount of quinolinate was varied, showing that the number of organic building blocks determines the physicochemical properties of materials, which differ significantly from those commonly reported for hydrotalcites without any quinolinate. The order of layers, specific surface area and coordination of aluminium were the parameters most significantly influenced by the presence of the quinolinate as a part of the brucite-like layers...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27843488/dft-and-td-dft-calculation-of-new-thienopyrazine-based-small-molecules-for-organic-solar-cells
#2
Mohamed Bourass, Adil Touimi Benjelloun, Mohammed Benzakour, Mohammed Mcharfi, Mohammed Hamidi, Si Mohamed Bouzzine, Mohammed Bouachrine
BACKGROUND: Novel six organic donor-π-acceptor molecules (D-π-A) used for Bulk Heterojunction organic solar cells (BHJ), based on thienopyrazine were studied by density functional theory (DFT) and time-dependent DFT (TD-DFT) approaches, to shed light on how the π-conjugation order influence the performance of the solar cells. The electron acceptor group was 2-cyanoacrylic for all compounds, whereas the electron donor unit was varied and the influence was investigated. METHODS: The TD-DFT method, combined with a hybrid exchange-correlation functional using the Coulomb-attenuating method (CAM-B3LYP) in conjunction with a polarizable continuum model of salvation (PCM) together with a 6-31G(d,p) basis set, was used to predict the excitation energies, the absorption and the emission spectra of all molecules...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27822298/towards-emic-rational-design-setting-the-molecular-simulation-toolbox-for-enantiopure-molecularly-imprinted-catalysts
#3
REVIEW
Tessa Jalink, Tom Farrand, Carmelo Herdes
A critical appraisal of the current strategies for the synthesis of enantiopure drugs is presented, along with a systematic background for the computational design of stereoselective porous polymers. These materials aim to achieve the enantiomeric excess of any chiral drug, avoiding the racemic separation. Particular emphasis is given to link statistical mechanics methods to the description of each one of the experimental stages within the catalyst's synthesis, setting a framework for the fundamental study of the emerging field of molecularly imprinted catalysts...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27818708/investigation-on-the-self-association-of-an-inorganic-coordination-compound-with-biological-activity-casiope%C3%A3-na-iii-ia-in-aqueous-solution
#4
Alejandro Marín-Medina, Juan Carlos García-Ramos, Lena Ruíz-Azuara, Ernesto Carrillo-Nava
From studies using different experimental techniques employed to determine the presence of aggregates e.g. isothermal titration calorimetry, surface tension, electrical conductivity, UV-Vis spectrophotometry, dynamic and static light scattering, it is clearly demonstrated that the compound [Cu(4, 4'-dimethyl-2, 2'-bipyridine)(acetylacetonato)H2O]NO3 (Casiopeína III-ia), promising member of a family of new generation compounds for cancer treatment, is able to auto associate in aqueous media. Physicochemical properties associated with the formation of the aggregates were determined in pure water and in phosphate buffer media in order to simulate physiological conditions...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27812368/further-structure-activity-relationships-study-of-substituted-dithiolethiones-as-glutathione-inducing-neuroprotective-agents
#5
Dennis A Brown, Swati Betharia, Jui-Hung Yen, Ping-Chang Kuo, Hitesh Mistry
BACKGROUND: Parkinson's disease is a neurodegenerative disorder associated with oxidative stress and glutathione depletion. The induction of cellular glutathione levels by exogenous molecules is a promising neuroprotective approach to limit the oxidative damage that characterizes Parkinson's disease pathophysiology. Dithiolethiones, a class of sulfur-containing heterocyclic molecules, are known to increase cellular levels of glutathione; however, limited information is available regarding the influence of dithiolethione structure on activity...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27803730/quick-assessment-of-the-economic-value-of-olive-mill-waste-water
#6
Riccardo Delisi, Filippo Saiano, Mario Pagliaro, Rosaria Ciriminna
BACKGROUND: Olive biophenols are emerging as a valued class of natural products finding practical application in the food, pharmaceutical, beverage, cosmetic and nutraceutical industries due to their powerful biological activity which includes antioxidant and antimicrobial properties. Olive mill waste water (OMWW), a by-product in olive oil manufacturing, is rich in biophenols such as hydroxytyrosol and tyrosol. The amount of biophenols depends on the cultivar, the geographical area of cultivation, and the seasonal conditions...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27795734/the-pharmacokinetics-bioavailability-and-excretion-of-bergapten-after-oral-and-intravenous-administration-in-rats-using-high-performance-liquid-chromatography-with-fluorescence-detection
#7
Xie-An Yu, John Teye Azietaku, Jin Li, Mingrui An, Jun He, Jia Hao, Jun Cao, Yan-Xu Chang
A sensitive, specific, reproducible and optimized high performance liquid chromatography with fluorescence detection (HPLC-FLD) method for the determination of bergapten in rat plasma was established and applied to the pharmacokinetic and bioavailability study in rat after oral and intravenous administration of bergapten. The method was also successfully applied to the excretion study of bergapten after an oral administration of bergapten at a dose of 15 mg kg(-1) to rats. The sample preparation was achieved using liquid-liquid extraction...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27790286/sol-gel-encapsulation-of-au-nanoparticles-in-hybrid-silica-improves-gold-oxidation-catalysis
#8
Rosaria Ciriminna, Valerica Pandarus, Riccardo Delisi, Antonino Scurria, Maria Pia Casaletto, Francesco Giordano, François Béland, Mario Pagliaro
BACKGROUND: The introduction of an heterogeneously catalyzed gold-based alcohol oxidation process of broad applicability using a clean primary oxidant would be highly desirable. Gold is non toxic and carbonyl and carboxyl compounds are widely used to produce medicines, plastics, colorants, paints, detergents, fragrances, flavors, and other valued functional products. RESULTS: The sol-gel entrapment of gold nanoparticles in hybrid silica improves gold-based oxidation catalysis applied to the selective oxidation of alcohols with aqueous hydrogen peroxide as eco-friendly primary oxidant...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27790285/kinetic-modeling-of-nicotine-in-mainstream-cigarette-smoking
#9
Joshua Kibet, Caren Kurgat, Samuel Limo, Nicholas Rono, Josephate Bosire
BACKGROUND: The attempt to understand the kinetic behavior of nicotine in tobacco will provide a basis for unraveling its energetics in tobacco burning and the formation of free radicals considered harmful to the cigarette smoking community. To the best of our knowledge, the high temperature destruction kinetic characteristics of nicotine have not been investigated before; hence this study is necessary especially at a time addiction science and tobacco research in general is gaining intense attention...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27621755/quantification-of-plasmid-dna-reference-materials-for-shiga-toxin-producing-escherichia-coli-based-on-uv-hr-icp-ms-and-digital-pcr
#10
Wen Liang, Li Xu, Zhiwei Sui, Yan Li, Lanying Li, Yanli Wen, Chunhua Li, Shuzhen Ren, Gang Liu
BACKGROUND: The accuracy and metrology traceability of DNA quantification is becoming a critical theme in many fields, including diagnosis, forensic analysis, microorganism detection etc. Thus the research of DNA reference materials (RMs) and consistency of DNA quantification methods has attracted considerable research interest. RESULTS: In this work, we developed 3 plasmid candidate RMs, containing 3 target genes of Escherichia coli O157:H7 (E. coli O157:H7) and other Shiga toxin-producing Escherichia coli (STEC): stx1, stx2, and fliC (h7) respectively...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27570541/new-method-for-sequestration-of-silver-nanoparticles-in-aqueous-media-in-route-toward-municipal-wastewater
#11
Marie-Laine Roy, Christian Gagnon, Jonathan Gagnon
BACKGROUND: Nanomaterials are widely used in industry for their specific properties. Silver nanoparticles (Ag NPs) are largely used in several consumer products notably for their antibacterial properties and will likely be found in wastewater, then in the receiving environment. The development of a product capable to sequestrate those released contaminants is needed. Under environmental conditions, the biopolymer chitosan can generally coordinate the cationic metals. Ag NPs present unique properties due to their high surface/mass ratio which are promising for their sequestration...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27555879/4-aroylpiperidines-and-4-%C3%AE-hydroxyphenyl-piperidines-as-selective-sigma-1-receptor-ligands-synthesis-preliminary-pharmacological-evaluation-and-computational-studies
#12
Hermia N Ikome, Fidele Ntie-Kang, Moses N Ngemenya, Zhude Tu, Robert H Mach, Simon M N Efange
BACKGROUND: Sigma (σ) receptors are membrane-bound proteins characterised by an unusual promiscuous ability to bind a wide variety of drugs and their high affinity for typical neuroleptic drugs, such as haloperidol, and their potential as alternative targets for antipsychotic agents. Sigma receptors display diverse biological activities and represent potential fruitful targets for therapeutic development in combating many human diseases. Therefore, they present an interesting avenue for further exploration...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27540412/determination-of-diclofenac-concentrations-in-human-plasma-using-a-sensitive-gas-chromatography-mass-spectrometry-method
#13
Iltaf Shah, James Barker, Declan P Naughton, Stephen J Barton, Syed Salman Ashraf
BACKGROUND: A gas chromatography mass spectrometry (GCMS) method for the determination of diclofenac in human plasma has been developed and validated. RESULTS: This method utilizes hexane which is a relatively less toxic extraction solvent compared to heptane and benzene. In addition, phosphoric acid and acetone were added to the samples as deproteination agents, which increased the recovery of diclofenac. These revised processes allow clean extraction and near-quantitative recovery of analyte (approx...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27516808/polyphenolic-glycosides-isolated-from-pogostemon-cablin-blanco-benth-as-novel-influenza-neuraminidase-inhibitors
#14
Fang Liu, Wei Cao, Chao Deng, Zhaoquan Wu, Guangyao Zeng, Yingjun Zhou
BACKGROUND: Influenza is historically an ancient disease that causes annual epidemics and, at irregular intervals, pandemics. At present, the first-line drugs (oseltamivir and zanamivir) don't seem to be optimistic due to the spontaneously arising and spreading of oseltamivir resistance among influenza virus. Pogostemon cablin (Blanco) Benth. (P. cablin) is an important traditional Chinese medicine herb that has been widely used for treatment on common cold, nausea and fever. In our previous study, we have identified an extract derived from P...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27493683/microwave-assisted-synthesis-antifungal-activity-dft-and-sar-study-of-1-2-4-triazolo-4-3-a-pyridine-derivatives-containing-hydrazone-moieties
#15
Jin-Xia Mu, Yan-Xia Shi, Hong-Ke Wu, Zhao-Hui Sun, Ming-Yan Yang, Xing-Hai Liu, Bao-Ju Li
BACKGROUND: The increasing prevalence of multi-drug resistant fungal infections has encouraged the search for new antifungal agents. Hydrazone derivatives always exhibited diversity activities, including antifungal, anti-inflammatory, anti-oxidation, anti-cancer activity. Regarding the heterocyclic moiety, 1,2,4-triazolo[4,3-a]pyridine derivatives also display broad activities, such as antifungal activity, anticonvulsant activity, herbicidal activity, antimicrobial activity and anticancer activity...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27493682/simultaneous-quantification-of-triterpenoic-acids-by-high-performance-liquid-chromatography-method-in-the-extracts-of-gum-resin-of-boswellia-serrata-obtained-by-different-extraction-techniques
#16
Neha Sharma, Vikram Bhardwaj, Samar Singh, Sheikh Abid Ali, D K Gupta, Satya Paul, Naresh K Satti, Suresh Chandra, Mahendra K Verma
BACKGROUND: Boswellia serrata, also known as Indian frankincense is a commercially important medicinal plant which has been used for hundreds of years as an Ayurvedic medicine for the attempted treatment of arthritis. It contains naturally occurring triterpenoic acids, called as boswellic acids (BA's). RESULTS: A highly reproducible High performance liquid chromatography-ultraviolet diode array detection (HPLC-UV-DAD) method was developed for the simultaneous determination and quantitative analysis of eight major triterpenoic acids in Boswellia serrata gum resin obtained by different extraction techniques...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27493681/anti-cholinesterases-and-memory-improving-effects-of-vietnamese-xylia-xylocarpa
#17
Linh My Thi Lam, Mai Thanh Thi Nguyen, Hai Xuan Nguyen, Phu Hoang Dang, Nhan Trung Nguyen, Hung Manh Tran, Hoa Thi Nguyen, Nui Minh Nguyen, Byung Sun Min, Jeong Ah Kim, Jae Sue Choi, Mao Van Can
BACKGROUND: Alzheimer's disease (AD) is the most common cause of dementia among the elderly and is characterized by loss of memory and other cognitive functions. An increase in AChE (a key enzyme in the cholinergic nervous system) levels around β-amyloid plaques and neurofibrillary tangles is a common feature of AD neuropathology. Amnesic effects of scopolamine (acetylcholine receptor antagonist) can be investigated in various behavioral tests such as Morris water maze, object recognition, Y-maze, and passive avoidance...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27486478/screening-for-antioxidant-and-antibacterial-activities-of-phenolics-from-golden-delicious-apple-pomace
#18
Tingjing Zhang, Xinyuan Wei, Zhuang Miao, Hamada Hassan, Yunbo Song, Mingtao Fan
BACKGROUND: Synthetic antioxidants and antimicrobials are losing ground to their natural counterparts and therefore, the food industry has motivated to seek other natural alternatives. Apple pomace, a by-product in the processing of apples, is rich in polyphenols, and plant polyphenols have been used as food additives owing to their strong antioxidant and antimicrobial properties. The goal of this study was to screen the individual polyphenols with antioxidant and antimicrobial activities from the extracts (methanol, ethanol, acetone, ethyl acetate, and chloroform) of Golden Delicious pomace...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27458481/a-promising-antitumor-activity-of-evodiamine-incorporated-in-hydroxypropyl-%C3%AE-cyclodextrin-pro-apoptotic-activity-in-human-hepatoma-hepg2-cells
#19
Chao Qiu, Li-Na Gao, Kuo Yan, Yuan-Lu Cui, Ye Zhang
BACKGROUND: Evodiamine has gained wide interests recently because of its antitumor activities. However, a superior bioavailability is required to achieve better efficacy due to its poor water solubility. The aim of this study was to enhance the evodiamine's aqueous solubility by preparing evodiamine/hydroxypropyl-β-cyclodextrin (EVO/HP-β-CD) inclusion complex, which is incorporated evodiamine into HP-β-CD, and compare the antitumor activities before and after inclusion with HP-β-CD in human hepatoma HepG2 cells...
2016: Chemistry Central Journal
https://www.readbyqxmd.com/read/27446235/%C3%AE-glucosidase-inhibitors-from-the-bark-of-mangifera-mekongensis
#20
Hai Xuan Nguyen, Tri Cong Le, Truong Nhat Van Do, Tho Huu Le, Nhan Trung Nguyen, Mai Thanh Thi Nguyen
BACKGROUND: Mangifera mekongensis (Anacardiaceae) is cultivated for its edible fruit and has been used in traditional Vietnamese medicine for its anti-aging properties and for treating diabetes, vermifuge, and dysentery. As part of a search for biologically active compounds with reduction of the rate of glucose absorption, a screening has been initiated to evaluate natural product extracts for the inhibition of enzyme α-glucosidase. A n-hexane extract of the bark of M. mekongensis showed strong α-glucosidase inhibitory activity with IC50 value of 1...
2016: Chemistry Central Journal
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