文献类型：期刊文献

英文题名：Toluidine blue: Aggregation properties and distribution behavior in surfactin micelle solution

作者：Liu, Jing;Zou, Aihua;Mu, Bozhong[1]

机构：[1]E China Univ Sci & Technol, Adv Mat Lab, Shanghai 200237, Peoples R China; E China Univ Sci & Technol, Inst Appl Chem, Shanghai 200237, Peoples R China

年份：2010

卷号：75

期号：2

起止页码：496

外文期刊名：COLLOIDS AND SURFACES B-BIOINTERFACES

收录：;EI(收录号：20094912521159);WOS:【SCI-EXPANDED(收录号:WOS:000276921900016)】；

基金：Dr. A. Zou gratefully acknowledges the support of this work by Science Foundation for The Excellent Youth Scholars of East China University of Science and Technology (YJ0157115) and Research Fund for the New Teacher of the Doctoral Program of Higher Education of China (200802511024). This work is also supported by the National Natural Science Foundation of China (50574040), and by the Department of Science and Technology Shanghai (071607014).

语种：英文

外文关键词：Surfactin; Toluidine blue; Micelle; Binding constant; Distribution coefficient

摘要：Aggregation properties and distribution behavior of toluidine blue in surfactin solution have been investigated by UV, infrared spectrum and fluorescence measurements. The UV measurement indicates that the location of toluidine blue can facilitate the formation of toluidine blue aggregates in contrast to that in the absence of surfactin. The fluorescence results show that the micropolarity of pyrene initially increases and then decreases with the addition of toluidine blue molecules. The binding constants of toluidine blue with surfactin micelles and the distribution coefficients between the micelles phase and the aqueous phase have been calculated by Benesi-Hildebrand method and pseudo-phase model, respectively. The values of Delta H degrees < 0 (-22.11 kJ/mol) and Delta S degrees > 0 (12.58 +/- 0.07 J/(mol K)) show that electrostatic attractive interaction plays an important role in the location of toluidine blue in surfactin micelles. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.