UNESP - Universidade Estadual Paulista, Department of Biochemistry and Microbiology, Institute of Biological Sciences, Av. 24-A, 1515 Bela Vista, CEP 13506-900, Rio Claro, SP, Brazil.
Colloids Surf B Biointerfaces. 2011 Jul 1;85(2):301-5. doi: 10.1016/j.colsurfb.2011.03.001. Epub 2011 Mar 8.
Rhamnolipids have excellent emulsifying power with a variety of hydrocarbons, aromatic compounds and vegetable oils. This paper evaluates the effect of pH ranging from 3 to 9 on the emulsifying activity and stability of rhamnolipids and hydrophobic substrates (benzene, soybean oil and kerosene). Sodium dodecyl sulfate was used as a reference to compare the level of chemical and biological surfactant activity after 24 h (E(24)). The results indicate that pH exerts an influence over emulsion formation and stability. For rhamnolipids, peak emulsifying activity occurred under base conditions for all substrates, with the highest value achieved with kerosene at pH 8. The results of the present study demonstrate that rhamnolipids could replace chemical surfactants, such as SDS, in different industrial fields.
鼠李糖脂具有优异的乳化能力，可与各种碳氢化合物、芳香族化合物和植物油形成稳定的乳状液。本文研究了 pH 值范围为 3 到 9 对鼠李糖脂及其疏水性基质（苯、大豆油和煤油）的乳化活性和稳定性的影响。使用十二烷基硫酸钠（SDS）作为参考，比较了 24 小时后（E(24)）化学和生物表面活性剂活性的水平。结果表明，pH 值对乳状液的形成和稳定性有影响。对于鼠李糖脂，所有基质在碱性条件下均表现出最高的乳化活性，其中煤油在 pH 值为 8 时达到最高值。本研究结果表明，鼠李糖脂可以替代 SDS 等化学表面活性剂，应用于不同的工业领域。
