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1·Some peptides containing non - protein amino acid residues are introduced and the essential roles of these residues are discussed.

介绍了某些天然存在的含非蛋白氨基酸的生物活性肽及非蛋白氨基酸残基在相应活性肽中的重要作用。

2·L - aspartic acid is a non - essential, acidic, genetically coded amino acid. Found especially in young sugar cane and sugar - beet molasses.

天冬氨酸是一种非必需的酸性氨基酸，尤指从小的甘蔗和甜菜的糖蜜中提取的。

3·L - asparagine is a non - essential , neutrall , genetically coded amino acid . it is a crystalline amino acid , found in many plants , that is easily hydrolyzed to aspartic acid.

天冬酰胺是一种非必需的中性晶体氨基酸，许多植物里都有，易于水解为天门冬氨酸。