Effect on antioxidant activity of ‘Red Sun'kiwifruit by several preservation treatments during postharvest period

Several preservation treatments including 1- MCP, ozone, controlled atmosphere and heat shock were used on‘Red Sun'kiwifruit stored at ( 4 ± 1) ℃ and relative humidity 90% ~ 95% to investigate the effects of antioxidant physiological characteristics. During the storage, the content of vitamin C ( VC) , phenols, anthocyanin, and the activity of DPPH· radical- scavenging, superoxide dismutase ( SOD) , peroxidase ( POD) , catalase ( CAT) were determined.The results indicated that the treatment groups could obviously control the reduction of VCand anthocyanin, delay the appearance of DPPH· radical- scavenging, SOD, POD and CAT peak, and suppress the reduction of related activity.The ozone treatment ( ozone concentration of 200 mg / m3, processing time of 0.5h) was more effective in maintaining antioxidant activity and improving antioxidant ability than other treatments.