Identification of antioxidant compounds in commercial orange juice

DPPH(1,1-Diphenyl-2-picrylhydrazyl radical) method,FRAP(Ferric reducing antioxidant power) method,Folin- Ciocalteu assay and Ultra- high performance liquid chromatography- quadruple time- of- flight mass spectrometry(UPLC-QTOF-MS) were applied in this paper to analyze the antioxidant capacity of commercial orange juice and the antioxidants inside. The results showed that the commercial orange juice could scavenge the DPPH free radical (1023±9.56)μg/m L,VCEAC(Vitamin cequivalent antioxidant capaciy),and reduce iron ion(804.49±7.57)μg/m L,VCEAC. The phenolic content was rich (601.57±9.92)μg/m L,Ferulic acid equivalent. The compounds identified included narigenin and hesperidin. And the narigenin was one of the main antioxidants.