生物表面活性剂鼠李糖脂制备微乳状液

Microemulsions Prepared by Biosurfactant-Rhamnolipid

测定了298.15 K下鼠李糖脂羧基完全电离所需的N aOH量及其临界胶束浓度(CM C),探索了用鼠李糖脂制备微乳状液的可行性和基本条件,得到了鼠李糖脂-正庚烷-正丁醇-水微乳体系的相图,研究了N aOH对体系相态、界面张力和最佳盐度的影响。结果显示:该体系能够形成微乳状液;体系中N aOH具有双重作用,既可促进羧酸根电离,又起到了电解质的作用,并且在完全电离时体系的最佳盐度达到最大。

Rhamnolipid is a kind of biosurfactants. Experiments show that the microemulsion can be formed in rhamnolipid-n-butanol-n-heptane-water system. The quantity of NaOH and the critical micelle concentration （CMC） are determined when rhamnolipid was ionized entirely. The phase diagram of the system is obtained,and the formation and characteristic of phase microemulsion, interfacial tension and optimal salinity are affected by the concentration of NaOH in the system. Results illustrate that NaOH promotes ionization of carboxylic group, and increases electrolyte concentration. And when the surfactant is ionized entirely, the optimal salinity can reach the highest peak.