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Optimization of the Surface Activity of Biosurfactant–Surfactant Mixtures

Journal of Cosmetic Science | Vol. 70 No. 3
Authored by Yao Zhou, Swara Harne, and Samiul Amin


The impact that rhamnolipid (RL) and sophorolipid (SL) biosurfactants has on solution surface activity when used in conjunction with the commercially important zwitterionic surfactant cocamidopropyl betaine (CAPB) is highlighted for the first time through surface tension and surface rheology measurements on binary and ternary mixtures of these surfactants. It was observed that in both the binary (CAPB\/RL) and the ternary (CAPB\/RL\/SL) mixtures, RL tends to dominate at the air-water interface and primarily control both surface tension and surface elasticity behavior. Significant reduction of surface tension and enhancement of surface elasticity is observed as a result of the competitive adsorbtion\/dominance of the RL at the air–water interface and this leads to performance enhancements in terms of foam stability.


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