红球菌-R04生物降解多卤代联苯的影响因素研究

研究了不同取代元素以及取代元素的数量、位置等因素对 Rhodococcus sp. R04降解多卤代联苯的影响.结果表明,联苯苯环第4位上的氢分别被氟、氯、溴以及甲基基团取代后降解率由高到低依次为4-FB>4-CB34-MB>4-BrB;当取代元素相同时,随着取代原子数目的增加,多卤代联苯降解率降低;当取代元素及取代原子数目相同时,不同位置的取代对卤代联苯的降解影响较大,特别是2,6位取代会强烈抑制关键酶对卤代联苯的催化降解,导致降解率降低.

Influencing factor for the biodegradation of polyhalogenated biphenyls by Rhodococcus sp.R04

Three influencing factors,including different substituted elements,numbers and position of substituted elements were investigated to correlate structural features to degradation of polyhalogenated biphenyls by Rhodococcus sp.R04.For mono-substituents.degradation preference of R.sp.R04 were in the order 4-FB>4-CB>4-MB>4-BrB.When the substituted elements were same,degradation rotes of halogenated biphenyls reduced as halogen substitution increased.The strain Was relatively insensitive to the halogen substitution pattern on the biphenyl ring,when halogenated biphenyls containing the same halogen substitution and numbers,the effect of the position of substituted halogen on the degradation of polyhalogenated biphenyls was great,especially 2,6-CB,which intensively showed striking resistance to degradation,eventually led to the reduction of degradation rates.