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The present study was to analyze the antioxidant activity and the responsible  chemical constituents in Cephalotaxus oliveri Mast. aerial parts. DPPH  (2,2-diphenyl-1-picryl hydrazyl), ABTS  [2,2’-azinobis(3-ethylbenzothiazoline- 6-sulfonic acid)], reducing power and  total phenolic content assays indicate that the methanol extract of the  aerial parts is the most potent radical-scavenger and reducing agent with  the highest level of phenolic content among the test extracts. The highly  positive linear correlations implicate that the four assays have similar  capacity to predict the antioxidant potential of the aerial parts and  phenolic compounds present contribute significantly to DPPH and ABTS radical  scavenging activity and reducing power of the extracts. The plant also  displayed considerable superoxide anion radical scavenging activity.  LC-MS/MS and GC-MS analyses resulted in the identification of 22 compounds  in the methanol extract, among which are 15 phenolic compounds. The total  amount of the phenolic compounds in the methanol extract determined by HPLC  method was more than 5622.39 μg/g dry weight. The considerable antioxidant  potential and a high content of phenolic antioxidants suggest that C.  oliveri aerial parts are a potential source of natural antioxidants

Antioxidant activities and phenolic constituents of Cephalotaxus oliveri Mast. aerial parts