ダイズ濃縮たん白の消化性がラットの栄養に及ぼす影響(1) プロテアーゼ前処理を行ったダイズ濃縮たん白が消化酵素とたん白代謝関連酵素の活性及び小腸内のたん白消化生成物パターンに及ぼす影響

The digestion and metabolism of protein of rats fed soy protein concentrate (SP) pretreated by protease was investigated, and the nutritive value of the pretreated SP was discussed. Glutamate-pyruvate transaminase, arginase and xanthine oxidase activities in liver of rats fed heated SP are lower than those fed SP pretreated by protease and amino acid mixture simulated SP. There is more quantity of peptide in small intestine of rats fed SP pretreated by protease than that fed the amino acid mixture. In free amino acid pattern, however, no difference was shown between SP groups, but the patterns of SP groups, especially on the bases of methionine content, were different with that of amino acid mixture group. No difference is shown in the digestion and the biological values between SP groups. From these results, it was found that the pretreatment of SP by protease, which might improve the digestibility of SP, was effective for raising the availability of SP. It may be considered, furthermore, that methionine in SP is difficult to liberate in small intestine, which causes a wasteful absorption of amino acids for rat.