Synthesis, micellisation and interaction of novel quaternary ammonium compounds derived from l-Phenylalanine with 1,2-dipalmitoyl-sn-glycero-3-phosphocholine as model membrane in relation to their antibacterial activity, and their selectivity over human red blood cells
l-Phenylalanine have been synthesized and their antibacterial efficiencies were determined against various strains of Gram-positive and Gram-negative bacteria. The antibacterialactivity increased with increasing chainlength, exhibiting a cut-off effect at C14 for Gram-positive and C12 for Gram-negative bacteria. The l-Phenylalanine QUATS displayed enhanced antibacterial properties with a higher cut-off point
Synthesis, self-assembly, bacterial and fungal toxicity, and preliminary biodegradation studies of a series of<scp>l</scp>-phenylalanine-derived surface-active ionic liquids
作者:Illia V. Kapitanov、Andrew Jordan、Yevgen Karpichev、Marcel Spulak、Lourdes Perez、Andrew Kellett、Klaus Kümmerer、Nicholas Gathergood
DOI:10.1039/c9gc00030e
日期:——
imidazolium, and cholinium groups and enabled a comprehensive analysis of the effect of the alkyl esterchain (from C2 to C16) on the synthesis, toxicity, biodegradability, and surfactant properties of the novel SAILs. The evaluation of the SAILs revealed that a wide variety of properties were strictly dependent on the side chainlength, including their bacterial and fungal toxicities (from low toxicity to
Helical Polyisocyanopeptides as Lyotropic Liquid Crystals for Measuring Residual Dipolar Couplings
作者:Gao-Wei Li、Jiang-Ming Cao、Wen Zong、Li Hu、Mao-Lin Hu、Xinxiang Lei、Han Sun、Ren Xiang Tan
DOI:10.1002/chem.201700539
日期:2017.6.7
Residual dipolar couplings (RDC) emerged to be an important structural parameter for organic and biomolecules. Herein, a new helical polyisocyanopeptide (l,l‐PIAF‐OBn) that forms lyotropic liquid crystals (LLC) in CDCl3 is proposed as a novel weakly orienting medium for acquiring residual dipolar couplings (RDCs) of organic molecules. We demonstrate its application for the structural elucidation of
A low-molecular-weight organogelator derived from (L)-amino acids was designed and synthesized. The (L)-alanine derivatives were determined to be excellent gelators, forming good gels even when smaller amounts were added. Self-molecular aggregates were observed to be helical or sheet-like, and the gels were constructed by forming aggregates by self-molecular recognition.
New amino acid-based anionic surfactants and their use as enantiodiscriminating lyotropic liquid crystalline NMR solvents
作者:Krystyna Baczko、Chantal Larpent、Philippe Lesot
DOI:10.1016/j.tetasy.2004.01.022
日期:2004.3
New amino acid-based anionic surfactants have been synthesized and their use as chiral oriented NMR solvents studied. A series of sulfonated amphiphilic L-Phe or L-Ala derivatives with pentyl to tetradecyl tails were prepared by reacting the corresponding amino acid esters with o-sulfobenzoic anhydride. Their critical micelle concentrations (CMCs) range from 1.6 x 10(-5) to 1.4 x 10(-2) mol/L and depend on the alkyl chain length as well as on the nature of the amino acid block. These values are comparatively lower than those of classical surfactants such as alkylbenzenesulfonates and N-acylamino-acid carboxylates. Their use as chiral liquid crystals (CLC) for analytical purposes is reported. In particular, it is shown that aqueous solutions of these chiral sulfonates in the presence of chlorinated solvents (CHCl3, CH2Cl2, C2H2Cl4, or CCl4) provide homogeneous oriented NMR solvents able to differentiate between enantiomers of D,L-alanine-2-d(1) using proton and deuterium NMR spectroscopy. (C) 2004 Elsevier Ltd. All rights reserved.