表面活性剂对分枝杆菌KR2菌株降解菲的影响

采用同位素示踪方法，从表面活性剂的浓度、离子类型和直链长度三方面研究了表面活性剂对分枝杆菌KR2菌株降解菲的影响。结果表明，表面活性剂的存在不能促进KR2菌对菲的降解；高浓度表面活性剂(≥20mg·L^-1)的存在，使菲的降解出现延迟期，非离子表面活性剂Tween80在低浓度时(≤10mg·L^-1)可以优先作为营养基质被分枝杆菌KR2菌株利用，表面活性剂的离子类型对菲降解的抑制作用的顺序为阳离子表面活性剂TDTMA>阴离子表面活性剂LAS>非离子表面活性剂Tween80，表面活性剂的直链长度对菲降解的影响为直链越短，对微生物的毒性越大，菲降解得越不完全。

Effects of surfactants on degradation of phenanthrene by Mycobacterium ssp

With isotopic techniques, the effects of the concentration, ionic type, and straight chain length of surfactants on the degradation of phenanthrene by Mycobacterium ssp. KR2 were studied. The results showed that in the presence of surfactants, the degradation of phenanthrene was not increased. It was delayed in high concentrations of surfactants (> or = 20 mg.L-1). Tween 80 in its low concentration (< or = 10 mg.L-1) was used as a preferential substrate utilized by Mycobacterium ssp. KR2. The degradation was affected by the ionic types of surfactants, and the inhibition to the phenanthrene degradation was cationic surfactant TDTMA > anionic surfactant LAS > nonionic surfactant Tween 80. Different lengths of surfactant straight chains had different influence on the degradation of phenanthrene.