Crude polysaccharides (PRM) were extracted and purified from cold pressing rapeseed meal used as material. The technics that co-produced protein and polysaccharides from rapseseed meal mainly by ways of low alkali extraction and in series ultrafiltration was researched. Two fractions were separated from PRM with DEAE-cellulose and their chemical constitutes and molecular characteristics were also analyzed. The immune and in vivo antioxidant activities of PRM were also studied. The in vitro antioxidant activ...