1950 年 70 巻 12 号 p. 707-708
Thiazolidine-4-carboxylic acid and its derivatives (except the N-substituted compounds) show color reaction with ninhydrin, p-quinone and Folin's reagent, as well as with α-amino acids. Therefore, by the use of paper chromatography, cysteine and α-amino-β-mercaptocarboxylic acids are identified, as the derivatives of thiazolidine-4-carboxylic acid.