Effect of Fecal Excretion on Dioxins and Accumulation Controlled in Rat by Koya-tofu and Polydextrose
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概要
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In this study, the effect of different types of diets on the fecal excretion and body accumulation of dioxins in rats was investigated. The rats were dosed by gavage with 1, 2, 3, 4, 7, 8-HxCDD (200 pg in corn oil) once a week for 4 weeks and then fed with cellulose powder (CP), dehydrofrozen soybean protein (DFSP) and polydextrose powder (PP) diets. The fecal excretion of dioxin in the group fed with DFSP was 199% and PP was 152% greater than that of the CP group. The percentages on accumulation of dioxin in liver were decreased following feeding with each diet, in a range from 17.9% to 30.8%. Liver dioxin level of rats was decreased to 30.8% with DFSP diet, 26.5% with PP diet for 8 weeks and 17.9% with PP diet for 4 weeks, when compared to that in rats fed with CP diet. The effects of DFSP, non-fat frozen soybean protein (NFSP), soybean high-molecular weight fraction (HMF) and soybean phosphatidylcholine (SP) on the accumulation and fecal excretion of 2, 3, 7, 8-TeCDD in rats were studied. The fecal excretion of dioxin in the group fed SP group was 150%, DFSP group was 140%, HMF group was 140%, NFSP group was 120%, CP was 110% greater, than that of the rats fed BD. The percentages on accumulation in liver were decreased in a range from 4.9% to 17.1% (HMF diet was 17.1%, DFSP diet was 12.2%, SP diet was 1 2.2 %, NFSP diet was 6.7 %, and CP diet was 4.9 %) compared to that in rat fed BD. These findings suggest the dehydrofrozen soybean protein and polydextrose might be useful in the enhancement of fecal excretion of dioxins.
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