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Abstract
Human subjects ingested daily 5- to 20-mg doses of technical DDT, p,p′-DDE, or p,p′-DDD for 81 to 183 days. Serum and adipose concentrations of DDT and DDT metabolites in response to these dosings have indicated that the initial dechlorination of DDT is of critical importance to its metabolic fate. Conversion to the saturated p,p′-DDD makes possible further degradation to the readily excreted p,p′-DDA. Dehydrochlorination, on the other hand, yields p,p′-DDE, a stable metabolite that is avidly retained in adipose storage. In two subjects ingesting technical DDT, conversion to DDE has been extremely limited, while conversion to DDD has been regularly demonstrable during and after dosing. Tissue stores of p,p′-DDE in general population probably originate mainly from preformed dietary p,p′-DDE in the diet, rather than from p,p′-DDT.