Vibrational spectroscopic studies of the structure of di-amino acid peptides. Part II: cyclo(L-Asp-L-Asp) in the solid state and in aqueous solution

2009 ◽  
Vol 40 (11) ◽  
pp. 1498-1507 ◽  
Author(s):  
Andrew P. Mendham ◽  
Trevor J. Dines ◽  
Robert Withnall ◽  
John C. Mitchell ◽  
Babur Z. Chowdhry
Keyword(s):  
Aqueous Solution ◽  
Amino Acid ◽  
Solid State ◽  
Spectroscopic Studies

Vibrational spectroscopy and DFT calculations of di-amino acid cyclic peptides. Part I: cyclo(Gly-Gly), cyclo(L-Ala-L-Ala) and cyclo(L-Ala-Gly) in the solid state and in aqueous solution

2009 ◽  
Vol 40 (11) ◽  
pp. 1478-1497 ◽  
Author(s):  
Andrew P. Mendham ◽  
Trevor J. Dines ◽  
Martin J. Snowden ◽  
Babur Z. Chowdhry ◽  
Robert Withnall
Keyword(s):  
Aqueous Solution ◽  
Amino Acid ◽  
Solid State ◽  
Dft Calculations ◽  
Vibrational Spectroscopy ◽  
Cyclic Peptides

Separation of phenylenediamine isomers by using decamethylcucurbit[5]uril

2021 ◽  
Author(s):  
Long Cao ◽  
Han-Ling Guo ◽  
Rui Lian Lin ◽  
Li-Fei Tian ◽  
Zhi-Hua Zhang ◽  
...  
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Solid State ◽  
Phenylenediamine Isomers

Using multiple techniques, this work studied the binding behaviors of decamethylcucurbit[5]uril (Me10Q[5]) with o-, m- and p-phenylenediamine (PDA) isomers both in solid state and in aqueous solution. Experimental data indicate...

Aqueous solution thickening of amino acid‐based surfactant by alkylpyrrolidone

2021 ◽  
Author(s):  
Xuemin Liu ◽  
Ke Wu ◽  
Weili Song ◽  
Qiuyun Lei ◽  
Hui Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Amino Acid

Cationic poly-L-amino acid-enhanced selective hydrogen production based on formate decomposition with platinum nanoparticles dispersed by polyvinylpyrrolidone

2021 ◽  
Author(s):  
Yusuke Minami ◽  
Yutaka Amao
Keyword(s):  
Aqueous Solution ◽  
Amino Acid ◽  
Hydrogen Production ◽  
Formic Acid ◽  
Platinum Nanoparticles ◽  
Hydrogen Carrier ◽  
Low Toxicity ◽  
Formate Decomposition

Formate is attracting attention as a hydrogen carrier because of its low toxicity and easy handling in aqueous solution. In order to utilize formic acid as a hydrogen carrier, a...

scholarly journals Inkjet Printing of Polypyrrole Electroconductive Layers Based on Direct Inks Freezing and Their Use in Textile Solid-State Supercapacitors

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3577
Author(s):  
Zbigniew Stempien ◽  
Mohmmad Khalid ◽  
Marcin Kozanecki ◽  
Paulina Filipczak ◽  
Angelika Wrzesińska ◽  
...  
Keyword(s):  
Solid State ◽  
Inkjet Printing ◽  
Surface Resistance ◽  
Spectroscopic Studies ◽  
Polymerization Temperature ◽  
Textile Fabrics ◽  
Symmetric Supercapacitor ◽  
Novel Method ◽  
A Current ◽  
Standard Support

In this work, we propose a novel method for the preparation of polypyrrole (PPy) layers on textile fabrics using a reactive inkjet printing technique with direct freezing of inks under varying temperature up to −16 °C. It was found that the surface resistance of PPy layers on polypropylene (PP) fabric, used as a standard support, linearly decreased from 6335 Ω/sq. to 792 Ω/sq. with the decrease of polymerization temperature from 23 °C to 0 °C. The lowest surface resistance (584 Ω/sq.) of PPy layer was obtained at −12 °C. The spectroscopic studies showed that the degree of the PPy oxidation as well as its conformation is practically independent of the polymerization temperature. Thus, observed tendences in electrical conductivity were assigned to change in PPy layer morphology, as it is significantly influenced by the reaction temperature: the lower the polymerization temperature the smoother the surface of PPy layer. The as-coated PPy layers on PP textile substrates were further assembled as the electrodes in symmetric all-solid-state supercapacitor devices to access their electrochemical performance. The electrochemical results demonstrate that the symmetric supercapacitor device made with the PPy prepared at −12 °C, showed the highest specific capacitance of 72.3 F/g at a current density of 0.6 A/g, and delivers an energy density of 6.12 Wh/kg with a corresponding power density of 139 W/kg.

A novel route for aspartame production by combining enzymatic and chemical reactions for industrial use

2020 ◽  
Vol 85 (2) ◽  
pp. 464-466
Author(s):  
Kenzo Yokozeki ◽  
Isao Abe
Keyword(s):  
Aqueous Solution ◽  
Amino Acid ◽  
Chemical Reactions ◽  
Acid Ester ◽  
Amino Acid Ester ◽  
Acyl Transferase ◽  
Enzymatic Production ◽  
Production Route ◽  
Industrial Use ◽  
Hcl Removal

ABSTRACT Here, we report a novel industrial aspartame production route, involving the enzymatic production of α-l-aspartyl-l-phenylalanine β-methylester from l-aspartic acid dimethylester and l-phenylalanine by α-amino acid ester acyl transferase. The route also involves the chemical transformation of α-l-aspartyl-l-phenylalanine β-methylester to α-l-aspartyl-l-phenylalanine methylester hydrochloride (aspartame hydrochloride) in an aqueous solution with methanol and HCl, followed by HCl removal to form aspartame.

Oxidative Peptide Bond Formation of Glycine-Amino Acid using 2-(Aminomethyl)malononitrile as a Glycine Unit

2021 ◽  
Author(s):  
Xiaoling Wang ◽  
Jing Li ◽  
Yujiro Hayashi
Keyword(s):  
Aqueous Solution ◽  
Amino Acid ◽  
Bond Formation ◽  
Peptide Bond ◽  
Peptide Bond Formation ◽  
Amide Linkage

Amide linkage of glycine-amino acid was synthesized by coupling of substituted 2-(aminomethyl)malononitrile as a C-terminal glycine unit and N-terminal amine using CsOAc and O2 in aqueous solution. This is a...

scholarly journals Fuzzy complexes of myelin basic protein: NMR spectroscopic investigations of a polymorphic organizational linker of the central nervous systemThis paper is one of a selection of papers published in this special issue entitled “Canadian Society of Biochemistry, Molecular & Cellular Biology 52nd Annual Meeting — Protein Folding: Principles and Diseases” and has undergone the Journal's usual peer review process.

2010 ◽  
Vol 88 (2) ◽  
pp. 143-155 ◽  
Author(s):  
David S. Libich ◽  
Mumdooh A.M. Ahmed ◽  
Ligang Zhong ◽  
Vladimir V. Bamm ◽  
Vladimir Ladizhansky ◽  
...  
Keyword(s):  
Solid State ◽  
Myelin Basic Protein ◽  
Solid State Nmr ◽  
Basic Protein ◽  
Peer Review Process ◽  
Protein Nmr ◽  
Spectroscopic Studies ◽  
Intrinsically Disordered ◽  
The Central Nervous System ◽  
Structural Homeostasis

The classic 18.5 kDa isoform of myelin basic protein (MBP) is central to maintaining the structural homeostasis of the myelin sheath of the central nervous system. It is an intrinsically disordered, promiscuous, multifunctional, peripheral membrane protein, whose conformation adapts to its particular environment. Its study requires the selective and complementary application of diverse approaches, of which solution and solid-state NMR spectroscopy are the most powerful to elucidate site-specific features. We review here several recent solution and solid-state NMR spectroscopic studies of 18.5 kDa MBP, and the induced partial disorder-to-order transitions that it has been demonstrated to undergo when complexed with calmodulin, actin, and phospholipid membranes.

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