Counterion-induced changes to the micellization of surfactin-C16 aqueous solution.
The effects of counterions on surfactin-C(16) micelle solution with its critical micelle concentration (cmc), microenvironment properties in micelles, micelle size distribution, and morphology were investigated by fluorescence, dynamic light-scattering, and freeze-fracture transmission electron microscopy measurements. Counterions enhanced the surface activity of surfactin-C(16) and reduced the cmc. With the micellization of surfactin-C(16), it adopted a beta-sheet conformation, and univalent concentrations reduced micelle micropolarity, increased micelle microviscosity, and tended to cause formation of small and spherical micelles, while divalent counterions had a special effect. With low concentration of divalent cations, they had strong interaction with surfactin-C(16) micelles and tended to form larger micelle aggregates.
Li
Yi
Y
Laboratory for Advanced Materials and Institute of Applied Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, PR China.
Zou
Ai-Hua
AH
Ye
Ru-Qiang
RQ
Mu
Bo-Zhong
BZ
D000595:Amino Acid Sequence; D007477:Ions / Q000737:chemistry*; D008823:Micelles; D046529:Microscopy, Electron, Transmission; D010456:Peptides, Cyclic / Q000737:chemistry*; D017433:Protein Structure, Secondary; D013050:Spectrometry, Fluorescence; D014867:Water / Q000737:chemistry*
D007477:Ions; D008823:Micelles; D010456:Peptides, Cyclic; C546617:surfactin C16; D014867:Water