/al"euh neen', -nin/, n. Biochem.any of several isomers of a colorless, crystalline, water-soluble amino acid, CH3CH(NH2)COOH, found in many proteins and produced synthetically: used chiefly in biochemical research. Abbr.: Ala; Symbol: A[1860-65; AL(DEHYDE) + -an- (arbitrarily inserted) + -INE2]
* * *Either of two organic compounds.Alpha-alanine is one of the nonessential amino acids, found in most proteins and particularly abundant in fibroin, the protein in silk. It is used in research and as a dietary supplement. Beta-alanine is a naturally occurring amino acid not found in proteins. It is an important constituent of the vitamin pantothenic acid and is used in its synthesis, as well as in biochemical research, electroplating, and organic synthesis.
* * *either of two amino acids, one of which (α-alanine) is a constituent of proteins. An especially rich source of α-alanine is silk fibroin, from which the amino acid was first isolated in 1879. Alanine is one of several so-called nonessential amino acids for birds and mammals; i.e., they can synthesize it from pyruvic acid (formed in the breakdown of carbohydrates) and do not require dietary sources. Beta-alanine is not found in proteins but occurs naturally in two peptides, carnosine and anserine, found in mammalian muscle. It is an important constituent of the vitamin pantothenic acid.
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