Abstract:

Proximate nutritional components and amino acids in fruit bodies of Pleurotus eryngii cultivated in
different culture media were studied. The nutritional value of proteins was evaluated and compared by the wellrecognized
method worldwide. Results showed that the percentage of essential to total amino acids ranged from 46.4% to
49.5%. Fruit bodies of P. eryngii cultivated in medium 7, with sawdust as the sole carbon source (55%), had the highest
crude protein content (20.62%) and nutritional index (18.5), while fruit bodies from culture medium with both corncob and
sawdust as carbon source (55%) had the highest amino acid score (95.0), chemical score (62.5) and score of ratio coefficient
of amino acid (41.94). Furthermore, essential amino acid index and biological value were higher in fruit bodies from culture
medium 1, with relatively lower content of nitrogen source (22%). The addition of cornmeal or soybean meal could improve
the nutritional value of proteins. Overall, these results can provide theoretical basis for achieving high quality and quantity of
P. eryngii in bottle cultivation.

Key words: Pleurotus eryngii, culture medium, protein, nutritional index, ratio coefficient of amino acid