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A novel polysaccharide fraction(BCP-1)was extracted from the black currant fruit by ultrasound-assisted compound enzyme and purified by chromatography on macroporous resin D4006,anion-exchange Q-Sepharose FF and Sephadex G-100 columns.BCP-1 consisted of galacturionic acid,xylose,mannose,glucose and galactose in a ratio of 1.00:3.14:1.83:17.90:1.98 and its molecular weight was 14050 Da.