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首页> 外文期刊>Journal of Nutritional Science and Vitaminology >Relative importance of phytohemagglutinin (lectin) and trypsin-chymotrypsin inhibitor on bean (Phaseolus vulgaris L) protein absorption and utilization by the rat.
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Relative importance of phytohemagglutinin (lectin) and trypsin-chymotrypsin inhibitor on bean (Phaseolus vulgaris L) protein absorption and utilization by the rat.

机译：植物血凝素（凝集素）和胰蛋白酶-胰凝乳蛋白酶抑制剂对豆类（菜豆）的蛋白质吸收和利用的相对重要性。

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摘要

The main objective of this work was to perform a comparative study of the antinutritional and/or toxic properties of phytohemagglutinin and trypsin-chymotrypsin inhibitor extracted from the seed of a commercial cultivar of edible bean used in Brazil. Bean proteins were extracted in acidic salt solution and fractionated by dialysis and centrifugation, then freeze-dried. The total freeze-dried bean extract and the globulin or albumin protein fraction were resuspended in distilled water and heated (100 degrees C, 30 min) for inactivation of hemagglutinin. Diets were prepared with unheated bean protein fractions and heated ones (100% trypsin inhibitor activity, but 0% phytohemagglutinin activity). As a result, the inhibition of growth and poor dietary protein utilization were observed in rats fed diets containing unheated bean protein fractions, but not in rats fed diets containing heated fractions. It was thus assumed that phytohemagglutinin is the main antinutritional and toxic factor that in dry bean (Phaseolus) protein and that trypsin inhibitor (Bowman-Birk type) did not interfere with rat growth.
机译：这项工作的主要目的是对从巴西商业食用豆品种的种子中提取的植物血凝素和胰蛋白酶-胰凝乳蛋白酶抑制剂的抗营养和/或毒性特性进行比较研究。在酸性盐溶液中提取豆蛋白，并通过透析和离心分离，然后冷冻干燥。将全部冻干的豆提取物和球蛋白或白蛋白蛋白级分重悬于蒸馏水中，并加热（100摄氏度，30分钟）以使血凝素失活。用未加热的豆蛋白级分和加热的级分准备日粮（100％的胰蛋白酶抑制剂活性，但0％的植物血凝素活性）。结果，在饲喂含有未加热豆蛋白级分的饮食的大鼠中观察到生长的抑制和不良的膳食蛋白质利用，但是在饲喂含加热级分的饮食的大鼠中未观察到生长的抑制和膳食蛋白质利用率差。因此，认为植物血凝素是干豆蛋白（Phaseolus）中的主要抗营养和毒性因子，而胰蛋白酶抑制剂（Bowman-Birk型）不会干扰大鼠的生长。

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