文献类型：期刊文献

英文题名：Interaction of the Biosurfactant, Surfactin with Betaines in Aqueous Solution

作者：Liu, Fang[1,2];Xiao, Jingwen[1,2];Garamus, Vasil M.[4];Almasy, Laszlo[3];Willumeit, Regine[4];Mu, Bozhong[1,2];Zou, Aihua[1,2]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[3]Inst Solid State Phys & Opt, Wigner Res Ctr Phys, H-1525 Budapest, Hungary;[4]Ctr Mat & Coast Res, Helmholtz Zentrum Geesthacht, Inst Mat Res, D-21502 Geesthacht, Germany

年份：2013

卷号：29

期号：34

起止页码：10648

外文期刊名：LANGMUIR

收录：;EI(收录号：20133616703159);WOS:【SCI-EXPANDED(收录号:WOS:000323811300006)】；

基金：A.Z. gratefully acknowledges the support of this work by the Alexander von Humboldt Foundation. We gratefully acknowledge the support of this work by Chinese National Natural Science Foundation (201003047) and Fundamental Research Funds for the Central Universities. The SANS measurements have been performed under the support of the European Commission (Grant No. 283883-NMI3).

语种：英文

外文关键词：Betaines - Hydrophobicity - Solutions - Surface tension

摘要：The interactions between the lipopeptide Surfactin and four betaines, N-dodecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (SDDAB), N-tetradecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (STDAB), N-hexadecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (SHDAB), and N-dodecyl-N,N-dimethyl-2-ammonio-acetate (C12BE) are studied by surface tension and small angle neutron scattering (SANS). SDDAB, STDAB, and SHDAB have the same headgroup but different hydrophobic chains. C12BE has different headgroup but the same hydrophobic chain with SDDAB. According to the interfacial parameters calculated from surface tension, the synergism between Surfactin and betaine is relevant with the molecule structure of betaine and the mole ratio of them. For betaines, the optimum alkyl chain length (STDAB) and long enough separation between positive charge and negative charge in headgroup are responsible for highest synergetic interaction with Surfactin. The aggregates of individual Surfactin and the mixtures of Surfactin and sulfopropyl betaines are predicted to be spherical based on the packing parameter (pp) and the average packing parameter (P-av), which is in close qualitative agreement with SANS data analysis, while Surfactin/C12BE forms ellipsoidal micelles due to the smaller headgroup of C12BE.