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丙氨酸及支链氨基酸α氨基氮主要以丙氨酸方式自肠道和肌肉输出。在肠道吸收期及吸收后期,肌肉不断释放丙氨酸,而含支链氨基酸的蛋白质,经肠道转移至肌肉,使肌肉中氮储存得以充盈。在肌肉中3-碳中间产物如丙酮酸,自支链氨基酸中得到一氨基团,此氨基酸在肌肉中被氧化后产生丙氨酸,后者与其他3-碳中间产物进肝脏后被转化为新的葡萄糖,而残余的氮则转化成尿素。新生成葡萄糖再被送返肌肉内分解成3-碳中间产物,再进行反复
Alanine and branched-chain amino acids Alpha amino nitrogen is mainly exported from the gut and muscle in alanine. In the intestinal absorption and absorption late, the muscles continue to release alanine, while branched-chain amino acid protein, the intestine transferred to the muscle, so that muscle nitrogen storage to fill. A 3-carbon intermediate in the muscle, such as pyruvate, derives an amino group from branched-chain amino acids, which are oxidized in the muscle to produce alanine, which is converted to the liver with other 3-carbon intermediates New glucose, while residual nitrogen is converted to urea. The new generation of glucose is then returned to the muscle decomposition into 3-carbon intermediates, and then repeated