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

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:481

Article

Jin, Lei^1,2  Garamus, Vasil M.³  Liu, Fang^1,2  Xiao, Jingwen^1,2  Eckerlebe, Helmut³  Willumeit-Roemer, Regine³  Mu, Bozhong^1,2  Zou, Aihua^1,2 

[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

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

DOI  :  10.1016/j.jcis.2016.07.044

来源: Elsevier

【 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.

【 授权许可】

Free