Objective To explore the effects of different drying methods on concentrations of main bioactive ingredients and antioxidant activities of extract from cultured hairy roots of Salvia miltiorrhiza Bunge( Danshen). Methods Contents of 9 salvianolic acids and 4tanshinones in freeze,vacuum,shade,and sun dried samples of hairy roots were determined by HPLC; meanwhile,antioxidant activities of the samples were assessed using DPPH assay,superoxide anion scavenging assay,and lipid peroxidation inhibition assay resp...