脉冲紫外线对鲜切火龙果抗氧化活性影响  

Effects of pulsed light on antioxidant activity of fresh-cut pitaya

作　　者：何心宇 郭煜民 袁勇军[1] 

机构地区：[1]浙江万里学院生物与环境学院,宁波315100

出　　处：《食品科技》2014年第5期38-42,共5页Food Science and Technology

基　　金：浙江省大学生科技创新项目(2013R419011);宁波市农业科研攻关项目(2011C10016)

摘　　要：研究脉冲紫外线对鲜切火龙果抗氧化活性的影响。分别采用辐照剂量为900、1350、1800 mJ/cm2的脉冲紫外线对鲜切火龙果进行辐照处理,以未处理组及普通紫外线辐照组(254nm紫外线辐照8 min)作为对照来评价鲜切火龙果的抗氧化活性的变化情况。结果表明,脉冲紫外线和普通紫外线辐照对于鲜切火龙果的还原能力以及DPPH·、·OH、O2-·、H2O2等活性的清除能力均具有一定的提高效果。辐照剂量不同,抗氧化活性的变化规律表现不同。与CK组相比,当辐照剂量为900 mJ/cm2时(0 d),鲜切火龙果的还原能力及对DPPH·、·OH、O2-·、H2O2的清除能力分别提高了16.00%、21.04%、8.06%、35.34%、34.85%;而当辐照剂量为1350mJ/cm2时(0 d),则分别提高了30.00%、24.70%、17.41%、9.59%、38.43%,与普通紫外线处理组的结果基本一致。在4℃贮藏过程中,各处理组的抗氧化活性均逐渐减少。结果表明脉冲紫外线对于提高鲜切火龙果的品质有潜在的应用价值。The changes of antioxidant activity of fresh-cut pitaya treated by pulsed light with the dose of 900, 1350, 1800 mJ/cm2, respectively, were evaluated in this paper, which used untreated group and common ultraviolet irradiation group （254 nm UV irradiation 8 min） as control. The results of this study showed that pulsed light and ability of the fresh-cut pitaya common ultraviolet radiation had a certain improving effect for the reducing and scavenging abilities of DPPH., O2, .OH and H202, which showed thedifferent represents of antioxidative activity in case of different dose. Compared with the untreated group （0 d）, the reducing capacity, scavenging abilities for DPPH., O2-, .OH and H2O2 of the fresh-cut pitaya treated by 900 mJ/cm2 of pulsed light enhanced 16.00%, 21.04%, 8.06%, 35.34% and 34.85%, respectively, while that of the fresh-cut pitaya treated by 1350 mJ/cm2 of pulsed light increased 30.00%, 24.70%, 17.41%, 9.59%, 38.43%, respectively, and which were basically the same with common ultraviolet irradiation group. Of all tested factors, the antioxidant activity decreased during storage of the fresh-cut pitaya at 4 %. The results of this study indicated that pulsed ultraviolet radiation had the potential application value for improving the quality of fresh-cut pitaya.

关 键 词：脉冲紫外线 鲜切火龙果 还原能力 自由基 清除作用 

分 类 号：TS255.3[轻工技术与工程—农产品加工及贮藏工程]