Aspartic α- and β-monohydrazides and aspartic α, β- and glutamic α, γ-dihydrazides were prepared and their qualitative separation has been performed by means of paper ionophoresis and chromatography. During ionophoresis in acidic medium, the dihydrazide partially decomposed into the isomers of monohydrazides liberating hydrazine. The hydrazinolysis products of whale and beef insulins were analyzed by the aid of elution chromatography on a Dowex 50 column and it was observed that the C-terminal positions were occupied by each one mole of alanine and asparagine in both cases. Furthermore, the present experiments suggested that all of the non-terminal carboxyl groups of the hormone belonged to only glutamic acid residues. Complicated reaction of the acidic amino acids or their amides with hydrazine was discussed.
制备了
天冬氨酸α-和β-单酰
肼以及
天冬氨酸α、β-和谷
氨酸α,γ-二酰
肼,并通过纸离子电泳和色谱法对其进行了定性分离。在酸性介质中的离子电渗过程中,二酰
肼部分分解成一酰
肼的异构体,释放出
肼。在Dowex 50柱上借助洗脱
色谱分析鲸
胰岛素和
牛胰岛素的
肼解产物,观察到在两种情况下C末端位置各被一摩尔丙
氨酸和天冬酰胺占据。此外,本实验表明激素的所有非末端羧基仅属于谷
氨酸残基。讨论了酸性
氨基酸或其酰胺与
肼的复杂反应。