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We studied in vitro metabolites of 2,4,6,2',4',6'-hexachlorobiphenyl (HCB, IUPAC PCB No. 155) produced by liver microsomes of a phenobarbital (PB)-treated beagle dog. The major metabolites were 3-hydroxy-2,4,6,2',4',6'-HCB (M-1), 4-hydroxy-2,6,2',4',6'-pentachlorobiphenyl (PenCB, M-2) and 3,4-dihydroxy-2,6,2',4',6'-PenCB (M-3). Furthermore, 4-hydroxy-2,3,6,2',4',6'-HCB (M-4), which could be formed via the 3,4-epoxidation and the subsequent NIH-shift of the chlorine from the 4 to the 3 position, was also detected. We found that M-3 is a common secondary metabolite of the two major monohydroxy metabolites, M-1 and M-2. These results indicate that the dog seems to metabolize and eliminate this congener not only by a mechanism involving direct insertion of a hydroxyl group but also via an arene oxide intermediate.

Identification of in Vitro Metabolites of 2,4,6,2',4',6'-Hexachlorobiphenyl from Phenobarbital-Treated Dog Liver Microsomes.