[EN] BISCATIONIC AND TRISCATIONIC AMPHILES AS ANTIMICROBIAL AGENTS [FR] COMPOSÉS AMPHIPHILES BISCATIONIQUES ET TRISCATIONIQUES UTILISÉS COMME AGENTS ANTIMICROBIENS
[EN] BISCATIONIC AND TRISCATIONIC AMPHILES AS ANTIMICROBIAL AGENTS [FR] COMPOSÉS AMPHIPHILES BISCATIONIQUES ET TRISCATIONIQUES UTILISÉS COMME AGENTS ANTIMICROBIENS
TMEDA-derived biscationic amphiphiles: An economical preparation of potent antibacterial agents
作者:Jacob W. Black、Megan C. Jennings、Julianne Azarewicz、Thomas J. Paniak、Melissa C. Grenier、William M. Wuest、Kevin P.C. Minbiole
DOI:10.1016/j.bmcl.2013.11.070
日期:2014.1
Bis-alkylated derivatives of N,N,N',N'-tetramethylethylenediamine (TMEDA) represent a well-known class of versatile biscationic amphiphiles, owing to their low cost and ease of preparation. Asymmetric TMEDA derivatives, however, have been studied significantly less, particularly in regards to their antimicrobial properties. We have thus prepared a series of 36 mono-and bis-alkylated TMEDA derivatives to evaluate their inhibition of bacterial growth. This series of compounds showed low micromolar activity against a panel of four bacteria. Optimal inhibition was observed when the biscationic amphiphiles possessed modest asymmetry and were composed of between 20 and 24 total carbon atoms in the side chains. These amphiphiles were prepared in a simple two-step procedure, utilizing inexpensive materials and atom-economical reactions, making them practical for further development. (C) 2013 Elsevier Ltd. All rights reserved.
Effects of Structure Dissymmetry on Aggregation Behaviors of Quaternary Ammonium Gemini Surfactants in a Protic Ionic Liquid EAN
作者:Xudong Wang、Qintang Li、Xiao Chen、Zhihong Li
DOI:10.1021/la304004u
日期:2012.12.4
The aggregation behaviors of a series of dissymmetric cationic Gemini surfactants, [CmH2m+1(CH3)(2)N(CH2)(2)N(CH3)(2)CnH2n+1]Br-2, designated as m-2-n (with a fixed m + n = 24, m = 16, 14, 12) have been investigated in a protic ionic liquid, ethylammonium nitrate (EAN). Surface tension, polarized optical microscopy (POM), small-angle X-ray scattering (SAXS), and rheological measurements are adopted to investigate the micellization and lyotropic liquid crystal (LLC) formation. The obtained results indicate that the structure dissymmetry plays an important role in aggregation process of m-2-n. With increasing degree of dissymmetry, the critical micellization concentration, the maximum reduction of solvent surface tension, and the minimum area occupied per surfactant molecule at the air/EAN interface all become smaller. The thermostability of formed LLCs is therefore improved because of the more compact molecules. These characteristics can be explained by the enhancement of solvophobic effect due to the increased structure dissymmetry of Gemini surfactants.