Abstract:The effects of rhamnolipid biosurfactant produced by Pseudomonas aeruginosa on the growth of 5 kinds of red tide algae (Alexandrium tamarense, Heterosigma akashiwo, Chaetoceros Didymus, Chaertoceros debilis and Nitzschia closterium) were investigated. When the concentration of rhamnolipid was increased gradually from 0.5mg/L to 12.0mg/L, it displayed different degrees of inhibitory action on the growth of the 5 kinds of algae. The reason for the different susceptibilities of the algae to the rhamnolipid concentration was because of the different fatty acid compositions of these algae. This different characteristic was interpreted by the different fatty acid composition of the algae biomembrane; the lower the content of polyunsaturated fatty acids, the lower the corresponding 96h-EC50 value, and vice versa. The optimal concentrations of rhamnolipid required for the effective mitigation of the 5 algal species ranged from 8.5mg/L to 15mg/L. Moreover the algal cells were irreversibly damaged by rhamnolipid concentrations of 15mg/L.
李玉瑛, 李冰. 鼠李糖脂对赤潮藻类的防治作用[J]. 中国环境科学, 2010, 30(增刊): 24-28.
LI Yu-Ying, LI Bing. The effect of rhamnolipid on the mitigation of red tide algae. CHINA ENVIRONMENTAL SCIENCECE, 2010, 30(增刊): 24-28.