The effect of rhamnolipid in harmful algal blooms mitigation
- 作者：Li yuyingLi bingZheng xilai
- 会议时间：2009-11-01
- 关键词：rhamnolipid ; mitigation ; Alexandrim tamarense ; Heterosigma akashiwo ; diatom
- 作者单位：Li yuying,Li bing(Department of Chemistry and Environmental Engineering, Wuyi University, Jiangmen, P. R. China, 529020)Zheng xilai(Institute of Environmental Science and Engineering, Ocean University of China, Qingdao, P. R.China, 266100)
- 母体文献：第十三届世界湖泊大会论文集
- 会议名称：第十三届世界湖泊大会
- 会议地点：武汉
- 主办单位：中国环境科学学会
- 语种：chi
摘要
The effects of rhamnolipid biosurfactant produced by Pseudomonas aeruginosa on the growth and the mitigation inhibitory of Alexandrium tamarense,Heterosigma akashiwo and 3 kinds of diatom ( Chaetoceros Didymus,Chaertoceros debilis and Nitzschia closterium) were investigated in the laboratoray.As the concentration of rhamnolipid was increased gradually from 0.5 to 12.0 mg/L,it displayed different degree of inhibitory action on the growth of 5 kinds of algae.The reason for the different susceptibilities of the algae to the rhamnolipid concentration was investigated according to the analysis of the difference in the algae fatty acid composition.This different character was interpreted by the different fatty acid composition of the algae biomembrane,the lower the content of polyunsaturated fatty acids was,and the lower the corresponding 96h - EC50 value was,the same on the contrary.The optimal concentrations of rhamnolipid required for the effective mitigation of the five algal species ranged from 8.5to 15 nig/L.The nucleotides of algal species were evaluated when the rhamnolipid was added in research as the release of intracellular components is a good indicator of membrane integrity.The results indicated that the algal cells were irreversibly damaged by the rhamnolipid.