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Complex Enzyme-Assisted Extraction, Purification, and Antioxidant Activity of Polysaccharides from the Button Mushroom, Agaricus bisporus (Higher Basidiomycetes).

Agaricus bisporus polysaccharides (ABP) were extracted by complex enzyme-assisted extraction methodology. The following were optimal conditions for the extraction of crude ABP: complex enzyme amount, 2.2%; temperature, 62°C; time, 3 h; and pH, 4. Under these conditions, the experimental yield of crude ABP was 6.87%. The crude ABP was purified by diethylaminoethyl-cellulose 52 chromatography and Sephadex G-100 chromatography, and one fraction-namely, ABP-1-was produced. The ABP-1 contained 93.67% carbohydrate, 1.46% protein, and 0.62% uronic acid. The constituent monosaccharides were predominantly glucose, galactose, mannose, and xylose. The antioxidant activities of ABP-1 were investigated by measuring its scavenging ability on 2,2-diphenyl-1-picrylhydrazyl and hydroxyl radicals, its ferric-reducing activity power, and the reducing power assay. At a concentration of 1.2 mg/mL, ABP-1 seemed to possess good free radical scavenging activity, with a scavenging value of about 56%. The results indicate that ABP-1 has good antioxidant activity.