低温等离子体处理对新疆‘小白杏’保鲜效果及品质的影响

Effect of Cold Plasma on Preservation and Storage Quality of Xinjiang‘Xiaobai’Apricot Fruits

目的:探究低温等离子体处理对新疆‘小白杏’后熟衰老、贮藏期果实品质、氧化酶系活力等方面的影响。方法:用低温等离子体机分别在80、90、100 kV的工作电压下处理新疆‘小白杏’40 s,于4℃、相对湿度95%的条件下贮藏42 d,每7 d检测杏果腐败指数、品质指标和抗氧化酶活力。结果:各低温等离子处理杏果保鲜效果均明显高于对照组,其中90 kV、40 s低温等离子体处理的防腐效果最为显著,贮藏第42天处理组腐败指数仅为对照组的24%,杏果的硬度为对照组的近1.5倍,VC含量和多酚含量分别是对照组的1.4、1.2倍,超氧化物歧化酶、过氧化氢酶、过氧化物酶活力分别提高了18%、28%和23%。结论:低温等离子体处理可降低采后杏果腐败指数,提高采后杏果贮藏期间的品质,并可以诱导杏果抗氧化酶活力提升。

Objective:To explore the effect of low-temperature plasma treatment on postharvest ripening,senescence,storage quality and antioxidant enzyme activities in Xinjiang‘Xiaobai’apricot fruit.Methods:The fruit were treated for 40 s with cold plasma generated at 80,90 or 100 kV using a dielectric barrier discharge generator and subsequently stored at 4℃and 95%relative humidity(RH)for up to 42 days.Decay index,quality indicators and antioxidant enzyme activities were measured every seven days throughout the storage period.Results:All cold plasma treatments preserved apricot fruit quality better than the control group,with the most pronounced effect being observed with cold plasma generated at 90 kV.On the 42nd day of storage,the decay index of the treatment group was only 24%as compared to the control group,the hardness was nearly 1.5 times higher,the contents of VC and polyphenols were 1.4 and 1.2 times higher,and the activities of superoxide dismutase(SOD),catalase(CAT)and peroxidase(POD)were increased by 18%,28%and 23%,respectively.Conclusion:Low-temperature plasma treatment can reduce the decay index,improve the storage quality,and induce the increase of antioxidant enzyme activities in apricot fruit.