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首页> 外文期刊>Journal of Environmental Science and Health >Aquatic toxicity and biodegradability of a surfactant produced by Bacillus subtilis ICA56
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Aquatic toxicity and biodegradability of a surfactant produced by Bacillus subtilis ICA56

机译：枯草芽孢杆菌ICA56生产的表面活性剂的水生毒性和生物降解性

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摘要

In this work, the environmental compatibility of a biosurfactant produced by a Bacillus subtilis strain isolated from the soil of a Brazilian mangrove was investigated. The biosurfactant, identified as surfactin, is able to reduce surface tension (ST) to 31.5 +/- 0.1mNm(-1) and exhibits a lowcritical micelle concentration (CMC) value (0.015 +/- 0.003gL(-1)). The highest crude biosurfactant concentration (224.3 +/- 1.9mgL(-1)) was reached at 72h of fermentation. Acute toxicity tests, carried out with Daphnia magna, Vibrio fischeri and Selenastrum capricornutum indicated that the toxicity of the biosurfactant is lower than that of its chemically derived counterparts. The results of the biodegradability tests demonstrated that the crude surfactin extract was degraded by both Pseudomonas putida and a mixed population from a sewage-treatment plant, in both cases the biodegradation efficiency being dependent on the initial concentration of the biosurfactant. Finally, as the biodegradation percentages obtained fall within the acceptance limits established by the Organization for Economic Co-operation and Development (Guidelines for Testing of Chemicals, OECD 301E), crude surfactin can be classified as a readily biodegradable compound.
机译：在这项工作中，研究了从巴西红树林土壤中分离出的枯草芽孢杆菌菌株生产的生物表面活性剂的环境相容性。被鉴定为表面活性素的生物表面活性剂能够将表面张力（ST）降低至31.5 +/- 0.1mNm（-1），并显示出低临界胶束浓度（CMC）值（0.015 +/- 0.003gL（-1））。发酵72小时达到最高的粗生物表面活性剂浓度（224.3 +/- 1.9mgL（-1））。对大型蚤（Daphnia magna），费氏弧菌（Vibrio fischeri）和七叶硒硒（Selenastrum capricornutum）进行的急性毒性试验表明，该生物表面活性剂的毒性低于化学衍生的表面活性剂的毒性。生物降解性测试的结果表明，粗制的表面活性素提取物被恶臭假单胞菌和污水处理厂的混合种群降解，在两种情况下生物降解效率均取决于生物表面活性剂的初始浓度。最后，由于获得的生物降解百分比在经济合作与发展组织（化学品测试指南，OECD 301E）确定的可接受范围内，因此粗制表面活性素可以归类为易于生物降解的化合物。

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