Polychlorinated Biphenyl의 토양 미생물 Aspergillus niger에 의한 생분해 경로

Abstract

Abstract As of many organochlorine pesticides, polychlorinated biphenyls are ubiquitous organiccontaminants, which can be found in the most environmental matrices. Their toxic effects include endocrine-disrupting activity. Most researches with these toxicants performed with mixtures of congeners, namelyAroclor and related study has been done in complex environmental matrix, rather than single biosystems orpure congeners. 5 congeners were synthesized and their fates in pure microbial culture (Aspergillus niger)were determined in this study. Among biphenyl and synthetic congeners, biphenyl, PCB-1 (2-chlorobiphenyl),and PCB-3 (4-chlorobiphenyl) were rapidly transformed to hydrophilic metabolites, followed by PCB-38(3,4,5-trichlorobiphenyl), while the degradation of PCB-126 (3,3',4,4',5-pentachlorobiphenyl) was not observed.The amounts of transformation for biphenyl, PCB-1, PCB-3, and PCB-38 were 65, 38, 52, and 2% respectively.The major metabolites of the above congeners were identified as mono- and di-hydroxy biphenyls, which areknown to give adverse endocrinological effects. Key words Polychlorinated biphenyl, soil, microorganism, biodegradation, Aspergillus niger