^(60)Coγ射线辐照对鲜食核桃采后膜脂过氧化作用的影响  

Effect of ^(60)Coγ-ray Irradiation on Membrane Lipid Peroxidation of Fresh Walnut during Storage

作　　者：马艳萍[1] 马惠玲[2] 刘兴华[3] 严拢兵[3] 

机构地区：[1]西北农林科技大学林学院,陕西杨凌712100 [2]西北农林科技大学生命科学学院,陕西杨凌712100 [3]西北农林科技大学食品科学与工程学院,陕西杨凌712100

出　　处：《农业机械学报》2011年第12期171-176,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：陕西省自然科学基金资助项目(2011JQ3002);西北农林科技大学博士科研启动基金资助项目(Z10P021101)

摘　　要：为探索60Coγ射线辐照对鲜食核桃冷藏期间膜脂过氧化作用的影响,以辽核4号核桃品种为试材,经0、0.1、0.5、1.0和5.0 kGy剂量的60Coγ射线辐照,采用0.03 mm厚聚乙烯(PE)袋包装后在(0±1)℃下贮藏,定期测定超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)、脂氧合酶(LOX)活性和丙二醛(MDA)含量、好果率及感官品质等指标。结果表明,以5.0 kGy剂量处理能显著地加剧核桃衰老进程;0.5 kGy剂量辐照处理则明显提高了鲜食核桃冷藏期间的SOD、CAT活性,降低了MDA的积累,抑制了POD、LOX活性,从而减缓了其膜脂过氧化作用,极显著地提高了其好果率及感官品质,因此0.5 kGy为鲜食核桃贮藏期90 d内的较佳辐照剂量。In order to measure the effect of 60Coγ-ray irradiation on membrane lipid peroxidation of fresh walnut,fresh ＇Liaohe 4＇ walnuts were exposed under 60Coγ-ray with 0,0.1,0.5,1.0,5.0 kGy,and subsequently packaged in 0.03 mm polyethylene bag and stored at the temperature about（0±1）℃.The following main indices,including the activity of superoxide dismutase（SOD）,catalase（CAT）,peroxidase（POD） and lipoxygenase（LOX）,the malonaldehyde（MDA）content,fine fruit rate and sensory quality,were determined at regular intervals.The results indicated that the irradiation with 5.0 kGy accelerated the process of senescence of fresh walnut.But 0.5 kGy irradiation remarkably increased the activity of SOD and CAT,decreased the MDA content,and inhibited the activity of POD and LOX.Thus,the membrane lipid peroxidation process in fresh walnut was slowed down and both fine fruit rate and sensory quality were increased significantly.In conclusion,0.5 kGy irradiation was identified as the best dose for the preservation of fresh walnut in the 90 d storage period.

关 键 词：鲜食核桃 60Coγ射线 冷藏 膜脂过氧化 

分 类 号：S664.1[农业科学—果树学] TS205.9[农业科学—园艺学]