Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . Phenylalanin. Amino-valerianic Acid, C5HnN02.—This acid is prob-ably a-amino-isoralcrianic acid, and as such bears the follow-ing formula: CH3 NH2 H-C—C-COOH. I ICH3 H 74 PHYSIOLOGICAL CHEMISTRY. It closely resembles leucin in many of its properties, and forthis reason is difficult to identify in the presence of leucin. Itis quite readily soluble in water and is dextrorotatory. Prolin, C5H9N02.—Chemically, prolin is a-pyrrolidin-carboxylic acid and
Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . Phenylalanin. Amino-valerianic Acid, C5HnN02.—This acid is prob-ably a-amino-isoralcrianic acid, and as such bears the follow-ing formula: CH3 NH2 H-C—C-COOH. I ICH3 H 74 PHYSIOLOGICAL CHEMISTRY. It closely resembles leucin in many of its properties, and forthis reason is difficult to identify in the presence of leucin. Itis quite readily soluble in water and is dextrorotatory. Prolin, C5H9N02.—Chemically, prolin is a-pyrrolidin-carboxylic acid and therefore possesses the following graphicstructure: H2C CH2 H,C\ Prolin was first obtained as a decomposition product of casein,is lsevorotatory and possesses a very sweet taste. The crystal-line form of lecvo-a-prolin is shown in Fig. 29, and the copper Fig. LjEVO-<x-Prolin. salt of prolin is represented by a micro-photograph in , page 75. Both were obtained from the proteid crystals of the copper salt possess a faint bluish tinge. Serin, C3H7N03.—Serin, from a chemical standpoint, isa-aniino-fS-hydroxy-propionic acid and possesses the follow-ing structural formula: DECOMPOSITION- PRODUCTS OF PROTEIDS. OH XII. I IH- C i1 —COOK. I IH II Fig. 30. 75
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