Abstract
Tocopherol, retinol, dehydroretinol, and retinyl palmitate were measured by reversed‐phase HPLC in liver, kidney, and plasma of lake char exposed to orally administered coplanar 3,3′,4,4′,5‐pentachlorobiphenyl (PCB). Tocopherol concentrations were unaffected after eight weeks. Liver retinol, dehydroretinol, and retinyl palmitate concentrations were lower, whereas kidney retinyl palmitate was elevated in PCB‐exposed groups. Tissue retinoid concentrations provide sensitive indicators of coplanar PCB exposure in fish.

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