Nutritional characteristics of proteins from the volva and pileus in cultivated mushroom Dictyophora rubrovolvata.

摘要

Dictyophora rubrovolvata is one of the commercially important mushroom species in China. However, its volva and pileus account for approx. 65% of the whole mushroom (by fresh wt.), and these are mostly discarded without utilization. To effectively utilize this waste, the present study determined their proximate composition and investigated the nutritional characteristics of their proteins via the analysis of amino acid composition and protein fractionation. Results showed that the volva and pileus were rich in protein (26.74 and 15.55% (dry basis), respectively). Predicted PER values of proteins of the volva and pileus were 2.8 and 2.2, respectively, and the amino acid scores were 96 and 85, respectively. Albumin was the highest fraction both in the volva and pileus, accounting for 69.52 and 27.91% of the crude protein, respectively. The protein quality of the volva was therefore higher than that of the pileus. It is proposed that the volva might be developed as a resource of high-quality vegetable-based protein.