大豆中亜鉛 (Zn) の動物に対する利用性

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Bioavailability of zinc in four kinds of soybean products (okara, kori-tofu, soy protein, and tofu) was compared to that in a basal diet containing casein as zinc source. Zinc contents in the basal and experimental diets were prepared to be 9 ppm. The experimental diet was prepared as the followings; casein, corn starch or corn oil in the basal diet was partly substituted for soybean products as protein, carbohydrate or fat source. The crude protein and crude fat contents in each experimental diet except okara-containing diet, were adjusted to the same level compared with the basal diet. Unfortunately, the crude protein content in okara-containing diet was lower than others. Thus, okara-containing diet group was not enough to keep the growth rate. Thirty male albino rats of Wister strain were divided into six groups, and fed ad libitum. The six groups were okara, kori-tofu, soy protein, tofu, basal and zinc added basal diet. The body weigh gain of soy protein group was significantly smaller than that of the others. When casein level in the experimental diet decreased, namely percentage of soy products in the diet increased, the growth rate was markedly decreased. To evaluate the bioavailability of dietary zinc, we measured an apparent absorption of zinc, and zinc content in tibia and liver. Zinc bioavailability in every soybean products was significantly lower than that in casein. The higher in the ratio of soybean products to casein in the diet, the lower in the apparent absorption of zinc and zinc content in tibia or liver. However, we could not determine the difference in bioavailability among the soybean products, because of the different content of zinc from the soy products in diet.
金城学院大学の論文
1985-02-28

大豆中亜鉛 (Zn) の動物に対する利用性

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