Nonprotein amino acids from seeds of Cycas circinalis and Phaseolus vulgaris.

C J Li, D M Brownson, T J Mabry, C Perera, E A Bell

Index: Phytochemistry 42(2) , 443-5, (1996)

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Abstract

Our chemical studies on Cycas circinalis seeds from Guam has provided two new nonprotein amino acids, N-(3'-one-5'-methyl)-hexylalanine and leucine betaine. N-methylisoleucine, previously reported as a component of naturally occurring peptides, has been isolated as a free amino acid from the seeds of Phaseolus vulgaris (pinto bean), together with S-methylcysteine, pipecolic acid and a dipeptide, gamma-glutamyl-leucine.