Isolation and purification of 5-hydroxytryptophan in extract from seeds of Griffonia simplicifolia by ion-exchange resin Purification of flavonoids from Drynariae Rhizoma by macroporous resin Studies on protein removal from polysaccharides in Panax ginseng by cation exchange resin Studies on protein removal from polysaccharides in Panax ginseng by cation exchange resin Purification of flavonoids from Drynariae Rhizoma by macroporous resin Separation and purification of cynarin from Cynara scolymus leaves by macroporous adsorption resin Separation and purification of cynarin from Cynara scolymus leaves by macroporous adsorption resin