%0 journal article
%@ 0021-9797
%A Jin, L., Haramus, V.M., Liu, F., Xiao, J., Eckerlebe, H., Willumeit-Roemer, R.

%D 2016
%J Journal of Colloid and Interface Science

%P 201-209 
%R doi:10.1016/j.jcis.2016.07.044
%T Interaction of a biosurfactant, Surfactin with a cationic Gemini surfactant in aqueous solution
%U https://doi.org/10.1016/j.jcis.2016.07.044
 
%X 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.