环境激素邻苯二甲酸二丁基酯的好氧微生物降解

Aerobic degradation of an endocrine-disrupting chemical, di-n-butyl phthalate by microorganism

通过驯化富集培养,从红树林底泥中分离出一株邻苯二甲酸二丁基酯降解菌。实验研究了邻苯二甲酸二丁基酯降解菌对邻苯二甲酸二丁基酯的生物降解特性并探讨了可能的生物降解途径。实验得出作为唯一碳源和能源的邻苯二甲酸丁基酯能够在好氧条件下降解,浓度为50 mg/L的邻苯二甲酸二丁基酯在48 h内可以完全被降解。检测到一种中间产物为邻苯二甲酸一丁基酯估计在降解过程中可能有邻苯二甲酸产生。试验结果表明,细菌对邻苯二甲酸二丁基酯具有高效降解作用。

In this article, the characteristics of DBP biodegradation were investigated by a degrading bacterium isolated from the mangrove soil. The experimental results showed that dibutyl phthalate （DBP）, as a sole source of carbon and energy, can be degraded and one of the degradation intermediates was identified as mono-butyl phthalate. The tentative pathway proposed for degradation of DBP by the bacterium under the aerobic condition could be through monnester initially, and further degradation of monoester produces phthalic acid, and finally CO2 and H2O.