First evidence for the occurrence of N.DELTA.-acetyl-L-ornithine and quantification of the free amino acids in the cultivated mushroom, Pleurotus ostreatus.

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Abstract
The free amino acid profile of the fruiting bodies of P. ostreatus was studied in detail. The 1st evidence for the occurrence of N.delta.-acetyl-L-ornithine in the mushroom was presented, and 33 ninhydrin-positive compounds were determined, besides N.delta.-acetyl-L-ornithine. Alanine, glutamic acid, valine, glutamine, glycine and leucine were predominant protein amino acids occurring in the free form. As regards the non-protein amino acids, ornithine, GABA, saccharopine, .alpha.-aminoadipic acid, ethanolamine, cystathionine and N-(.gamma.-glutamyl)ethanolamine were mainly detected. The sum of the N of the 3 abundant amino acids, alanine, glutamic acid and ornithine, accounted for .apprx. 40% of the total N in the amino acid fraction.