Interaction of a biosurfactant, Surfactin with a cationic Gemini surfactant in aqueous solution

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• 作者：Lei Jin^a ; ¹ ; Vasil M. Garamus^b ; ¹ ; Fang Liu^a ; Jingwen Xiao^a ; Helmut Eckerlebe^b ; Regine Willumeit-Rö ; mer^b ; Bozhong Mu^a ; Aihua Zou^a ; ^{aihuazou@ecust.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Surfactin ; Gemini surfactant ; Micelle ; Surface tension ; SANS
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：1 November 2016
• 年：2016
• 卷：481
• 期：Complete
• 页码：201-209
• 全文大小：1507 K

文摘

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.