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N-acetyl conjugates of basic amino acids newly identified in rat urine

Authors:	Kei Sasaoka Tadashi Ogawa Masumi Kimoto

Affiliation:	Department of Nutrition, School of Medicine, The University of Tokushima, Kuramoto-cho, Tokushima 770, Japan

Abstract:	Ninhydrin-negative conjugates of basic amino acids were isolated from rat urine and were characterized. The following conjugates of basic amino acids are the compounds newly identified in animal urine specimens, N^α-acetyl-N^π-methylhistidine, N^α-(N-acetyl-β-alanyl)histidine (N-acetylcarnosine), N^α-acetyl-N^G,N^′G-dimethylarginine, N^α-acetyl-N^G,N^G-dimethylarginine, and N^α-acetyl-N^?,N^?,N^?-trimethyllysine.

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