脉冲紫外线对新鲜葡萄抗氧化活性的影响

目的]研究4℃条件贮藏过程中脉冲紫外线对新鲜葡萄抗氧化活性的影响。方法]通过测定脉冲强光处理后4℃条件贮藏8 d过程中新鲜葡萄中DPPH·、O_2~-·、·OH和H2_O_2等的活性及还原能力来评价新鲜葡萄的抗氧化活性。结果]脉冲紫外线处理可提高新鲜葡萄的抗氧化活性,且与辐照剂量有关,不同抗氧化活性提高程度有所不同。在贮藏过程中,各处理组的抗氧化活性均逐渐降低。当辐照剂量为1 350 m J/cm2时,葡萄的还原力及对DPPH·、O_2~-·、·OH和H_2O_2活性的清除率分别提高了8.5%、7.8%、9.2%、16.2%和33.4%。结论]研究表明,脉冲紫外线可用来提高新鲜葡萄的品质。

Effects of Antioxidant Activity of Fresh Grapes by Pulse Ultraviolet Radiation

Objective] The aim was to study the effects of pulsed ultraviolet ray on antioxidant activity of fresh grapes during storage of 4 ℃. Method] The antioxidant activity of fresh grapes were evaluated through determining reduction power and scavenging abilities of DPPH· , O2-· , OH· and H2 O2 in fresh grapes treated by pulsed light during storage of 8 days at 4 ℃. Result] The results indicated that pulse ul-traviolet radiation could increase the antioxidant activities of fresh grapes, showing the activities in the different aspects with different pulse ir-radiation dose. Of all tested groups, the antioxidant activity decreased during storage of the fresh grapes.The scavenging abilities to the reduc-tion power, DPPH· , O2-· ,· OH and H2 O2 of the fresh grapes treated by 1 350 mJ/cm2 of pulsed light were increased 8.5%, 7.8%, 9.2%, 16.2% and 33.4%.Conclusion] The study indicated that pulse ultraviolet radiation can be used to improve quality of fresh grapes.