Abstract: The contents of antioxidant components in seven kinds of orange juices were assayed with the contont of VC ranges from 390.6 to 478.6 mg/L,of polyphenols from 573.1 to 655.0 mg/L of carotenoids from 5.47 to 7.25 mg/L and of limonoids from 0.10 to 0.17 mg/L.The TEAC values determined by ABTS/K2S2O8 system are from 4.79 to 6.09,with blood orange the highest and Jincheng the lowest.The relationship between TEAC values and the content of VC shows remarkable level(r = 0.868,p=0.011),and that between TEAC and polyphenols is significant(r=0.909,p=0.003),while there is no obvious correlationship between the TEAC and carotenoids(p>0.1).It was concluded that the polyphenols are probably the dominant antioxidant component in these seven kinds of oranges.

Key words: orange juice, active constituent, TEAC(trolox equivalent antioxidant capacity) value