Young and mature fruit-bodies of Leucopaxillus giganteus were divided into pileus and stipe. Then the chemical components of both parts were analyzed. There were more crude protein and crude fat contents in the young fruit-body than in the mature fruit-body, and there were more crude ash and carbohydrate contents in the mature fruit-body than the young fruit-body. There was more carbohydrate content in the stipe than in the pileus, and there were more moisture, crude protein, crude fat and crude ash contents in the pileus than the stipe. There was more mineral content in the mature fruit-body than there was in the young. The K content was the highest, followed by P and Mg. Six kinds of low molecular weight carbohydrates were identified in the fruit-body, trehalose being the major among them. Ten kinds of organic acids were identified in the fruit-body, malic being the major among them. There was a higher free amino acid content in the young fruit-body than in the mature fruit-body.
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