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Conformational preferences of [small beta]-sheet structures in cyclopropane-containing [gamma]-peptides

08-Apr-2015 | Ji Hyang Lee; Hae Sook Park; Young Kee Kang, New Journal of Chemistry, 2015

The conformational preferences of β-sheets in oligo-γ-peptides composed of 2-(aminomethyl)cyclopropanecarboxylic acid (γAmc3) with a cyclopropane constraint on the Cα-Cβbond were studied using density functional theory (DFT) methods in the gas phase and in solution (chloroform and water). ...

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Surface modifications of titanium implants by coating with bioactive and biocompatible poly (ε-caprolactone)/SiO2 hybrids synthesized via sol–gel

05-Apr-2015 | Author(s): Michelina Catauro , Flavia Bollino , Ferdinando Papale, Arabian Journal of Chemistry, 2015

Publication date: Available online 11 March 2015 Source:Arabian Journal of Chemistry Author(s): Michelina Catauro , Flavia Bollino , Ferdinando Papale Class I organic/inorganic hybrid materials have been synthesized by sol–gel method from a multicomponent solution containing tetraethyl ...

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Metal complexation studies of amylopectin‐g‐poly(N,N‐dimethylacrylamide‐co‐acrylic acid): A biodegradable synthetic graft copolymer

02-Apr-2015 | Haradhan Kolya, Tridib Tripathy, Polymer International, 2015

Abstract Synthesis of amylopectin‐g‐poly(N,N‐dimethylacrylamide‐co‐acrylic acid) was carried out by solution polymerization technique using potassium persulfate (K2S2O8) as the initiator. The graft copolymer was characterized by measuring molecular weight using size exclusion chromatography ...

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Synthesis, characterization and evaluation of quadripolymer with low molecular weight as water based drilling fluid viscosity reducer at high temperature (245°C)

02-Apr-2015 | Weian Huang, Cong Zhao, Zhengsong Qiu, Yee‐Kwong Leong, Hanyi Zhong, Jie Cao, Polymer International, 2015

Abstract To construct an ultra‐high temperature stable drilling mud with a relatively low viscosity, a new viscosity‐reducer additive was synthesized and evaluated. This additive is a quadripolymer of acrylic acid (AA), 2‐acry‐lamido‐2‐methyl‐1‐propane sulfonic acid (AMPS), methyl acrylate ...

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A solution-processed, mercaptoacetic acid-engineered CdSe quantum dot photocathode for efficient hydrogen production under visible light irradiation

02-Apr-2015 | Bin Liu; Xu-Bing Li; Yu-Ji Gao; Zhi-Jun Li; Qing-Yuan Meng; Chen-Ho Tung; Li-Zhu Wu, Energy & Environmental Science, 2015

We describe here a simple, efficient and stable CdSe QDs/NiO photocathode engineered using a molecular linker, mercaptoacetic acid (MAA), for H2 generation from neutral water. This protocol does not require any sacrificial reagent, external cocatalyst, protecting layer and buffer solution as ...

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Acid/Base‐Mediated Uptake and Release of Halide Anions with a Preorganized Aryl‐Triazole Foldamer

01-Apr-2015 | Wei Zhao, Ying Wang, Jie Shang, Yanke Che, Hua Jiang, Chemistry - A European Journal, 2015

Abstract A new approach for the construction of artificial receptors capable of selectively uptake and release of halides to mimic the biological halide ions pumps is developed, in which the preorganized aryl‐triazole foldamer was designed to bear a resorcinolic group in the central strand as ...

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EDC·HCl and Potassium Salts of Oxyma and Oxyma‐B as Superior Coupling Cocktails for Peptide Synthesis

31-Mar-2015 | Yahya E. Jad, Sherine N. Khattab, Beatriz G. de la Torre, Thavendran Govender, Hendrik G. Kruger, Ayman El‐Faham, Fe ..., European Journal of Organic Chemistry, 2015

Abstract Nowadays, DIC is the most widely used carbodiimide for solid‐phase peptide synthesis, while EDC·HCl is mostly used only for solution‐phase synthesis. In this paper, we report new coupling cocktails containing EDC·HCl in combination with potassium salts of OxymaPure and Oxyma‐B (i.e., ...

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Substituted Quinoline Quinones as Surrogates for the PQQ Cofactor: An Electrochemical and Computational Study

31-Mar-2015 | Walter L. Dorfner; Patrick J. Carroll; Eric J. Schelter, Organic Letters, 2015

Pyrroloquinoline quinones (PQQ) are important cofactors that shuttle redox equivalents in diverse metalloproteins. Quinoline 7,8-quinones have been synthesized and characterized as surrogates for PQQ to elucidate redox energetics within metalloenzyme active sites. The quinoline 7,8-quinones were ...

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IBX Oxidation of Benzenedimethanols in the Presence of Cucurbit[8]uril

30-Mar-2015 | Hang Cong, Qiuju Chen, Qingxia Geng, Zhu Tao, Takehiko Yamato, Chinese Journal of Chemistry, 2015

Abstract The cucurbit[8]uril (Q[8]) mediated oxidation of benzenedimethanols with o‐iodoxybenzoic acid (IBX) in aqueous solution has been investigated, and the results reveal the supramolecular catalysis depends on the electronic and geometric structure of substrate. In the cases of ...

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Separation of the Acid‐sugar Mixtures by Using Acid Retardation and further Concentration of the Eluents by Using Continuous‐effect Membrane Distillation

30-Mar-2015 | Jianjun Liu, Yingjie Qin, Pingli Li, Kunming Zhang, Qing Liu, Liqiang Liu, Journal of Chemical Technology & Biotechnology, 2015

Abstract BACKGROUND A major cost in acid‐catalysed hydrolysis of biomass to fermentable sugars is the consumption of acid itself. In this study, a combined process was developed, in which the acid and sugar in the hydrolysate were separated by using acid retardation process and then the ...

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