文献类型：期刊文献

英文题名：Interaction of a biosurfactant, Surfactin with a cationic Gemini surfactant in aqueous solution

作者：Jin, Lei[1,2];Garamus, Vasil M.[3];Liu, Fang[1,2];Xiao, Jingwen[1,2];Eckerlebe, Helmut[3];Willumeit-Roemer, Regine[3];Mu, Bozhong[1,2];Zou, Aihua[1,2]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[3]Helmholtz Zentrum Geesthacht, Ctr Mat & Coastal Res, Inst Mat Res, Max Planck Str 1, D-21502 Geesthacht, Germany

年份：2016

卷号：481

起止页码：201

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：;EI(收录号：20163102659195);WOS:【SCI-EXPANDED(收录号:WOS:000381447900022)】；

基金：We gratefully acknowledge the support of this work by Shanghai Natural Science Foundation (Grant No. 15ZR1409900), the National Natural Science Foundation of China (No. 21573070), and Fundamental Research Funds for the Central Universities. This work benefited from the use of the SasView application, originally developed under NSF award DMR-0520547.

语种：英文

外文关键词：Surfactin; Gemini surfactant; Micelle; Surface tension; SANS

摘要：The interaction between biosurfactant Surfactin and cationic Gemini surfactant ethanediyl-1,3-bis(dodecyldimethylammonium bromide) (abbreviated as 12-3-12) was investigated using turbidity, surface tension, dynamic light scattering (DLS) and small angle neutron scattering (SANS). Analysis of critical micelle concentration (CMC) values in Surfactin/12-3-12 mixture indicates that there is synergism in formation of mixed Surfactin/12-3-12 micelles. Although Surfactin and 12-3-12 are oppositely charged in phosphate buffer solution (PBS, pH7.4), there are no precipitates observed at the concentrations below the CMC of Surfactin/12-3-12 system. However, at the concentration above CMC value, the Surfactin/12-3-12 mixture is severely turbid with high 12-3-12 content. DLS and SANS measurements follow the size and shape changes of mixed Surfactin/12-3-12 aggregates from small spherical micelles via elongated aggregates to large bulk complexes with increasing fraction of Gemini surfactant. (C) 2016 Elsevier Inc. All rights reserved.