SUMMARY
Amino acid composition evaluation of edible mushrooms (Pleurotus spp.) cultivated on banana leaves
The protein quality of edible mushrooms besides being species/strain specific, could also vary with the growth substrate. The aim of this work was to determine the amino acid composition of the protein from edible mushrooms - Pleurotus sp. "Florida"(L1), P. ostreatoroseus (L2) and P. sajor-caju (L3), cultivated on banana leaves (BL) single and, mixed with sugar cane bagasse (BLSCB). Total amino acids, cystine and tryptophan were evaluated; the chemical score index and PDCAAS - "protein digestibility-correct amino acid scoring" were calculated. From both substrates, the studied species contain all essential amino acids; in decreasing order, the amino acids in great amounts were glutamic acid, aspartic acid, ,o: leucine and lysine. The L1 chemical score was 90.4, with limitation "". in sulfur and aromatic aminoacids when from BL substrate; and, from BLSC substrate the chemical score was 88.7 with limitation in aromatics only. The L2 and L3 was 100,0, independent of cultivation substrate. The calculated PDCAAS value, considering 90% of recommended digestibility, varied between 80.0 - 96%. The L1 proteins were limiting in sulfur and aromatic amino acids and had the lowest value of PDCAAS (˜ 80,0) in both substrates; the L3 proteins were limiting in aromatic, sulfur and tryptophan, dependent of cultivation substrate; the L2 proteins had the greatest value of PDCAAS (˜ 96%) and were limiting in aromatic and/or sulfur amino acids, dependent of cultivation substrate. Considering the conditions of this study, this protein of the studied species is incomplete, although of high biological value, comparable to meet.

Key words: amino acid composition, edible mushrooms, Pleurotus spp., substrate, banana leaves.



Recibido: 26/11/1997
Aceptado: 18/06/1998

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