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[Separation, purification and antioxidant activity of polysaccharide from Coprinus comatus].
We compared the ways of deproteinization for crude polysaccharides of Coprinus comatus, and finally selected Sevage method as the optimal method. Two main fractions of Ccp-I-A and Ccp-I-B were obtained after DEAE-52 cellulose and Sephadex G-200 chromatography, both were white-floc, soluble in water, insoluble in absolute ethyl alcohol, acetone and other organic solvents. Additionally, Fehling reagent, CTAB, Sulphuric acid-carbazole, I-KI and FeCl₃ reaction were all negative. GC analysis showed Ccp-I-A was composed of mannitose, glucose and galactose in molar ratios of 2.03:9.52:1, whereas Ccp-I-B was composed of fucose and galactose with molar ratios of 1:5.21. Antioxidant activity test showed that Ccp-I-A and Ccp-I-B had good scavenging abilities on DPPH and ·OH. Compared to Ccp-I-B,the scavenging activity of Ccp-I-A was much stronger, and the scavenging rate could reach 72.1% and 55.3% respectively when the concentration was 300 μg/mL.
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