The abilities of scavenging reactive oxygen species (ROS, O2-, OH· , H2O2 ) of the extracts trom the seeds of Brassica campestris Linn. were studied by chemical luminescence. The results showed that the extracts by hot extraction and cold-maceration extraction both had scavenging effect on ROS, their IC50 to O2- , OH· and H2O2 were 0. 033 3, 0.030 8,6.81×10-4 and 0.051 1, 0.025 3, 9.40×10-4 mg·mL-1 respectively. The antioxidant A separated from the extracts had the significant scavenging effect of O2- , OH· and H2O2, IC50 were 0,003 14, 0.001 62 and 5.96×10-6 mg·mL-1 respectively, obviously stronger than tea-polyphenols.
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