低温等离子体处理对猕猴桃浊汁品质的影响

Effect of Low Temperature Plasma Treatment on the Quality of Cloudy Kiwi Juice

研究低温等离子体电压及处理时间对猕猴桃浊汁品质的影响规律,为低温等离子体技术应用于猕猴桃浊汁的非热杀菌提供理论基础。以猕猴桃浊汁为原料,分别对其进行不同电压处理(10,25,40,55,70 kV)及不同时间(0.5,2,3.5,5,6.5 min)的低温等离子体处理,测定可滴定酸含量、浊度、△E值、VC含量、总酚含量、丙二醛含量、叶绿素含量、pH值、POD及APX活性,分析不同电压和不同时间处理对猕猴桃浊汁品质影响的规律。结果表明,低温等离子体处理对猕猴桃浊汁中丙二醛含量及△E值的影响显著(P<0.05);可溶性固形物含量、可溶性糖含量、可滴定酸含量、pH值随时间和电压的变化均不显著(P>0.05);浊度、VC含量、总酚含量、叶绿素含量显著降低(P<0.05);APX活性经低温等离子体处理后呈先上升后下降趋势(P<0.05);POD活性随电压的增大变化不显著(P>0.05),随时间的延长先显著上升后显著下降(P<0.05)。低温等离子体对猕猴桃浊汁的品质有一定影响,且不同电压、时间处理对各考察指标的影响机理不同。在利用低温等离子体对猕猴桃浊汁杀菌时,应选择合适的工艺参数,在确保杀菌效果的同时,尽可能多地保留营养成分。

The effect of low temperature plasma voltage and treatment time on the quality of kiwifruit juice was studied to provide a theoretical basis for the application of low temperature plasma technology to non-thermal sterilization of cloudy kiwi juice.Using cloudy kiwi juice as a raw material,it was treated with different voltages(10,25,40,55,70 kV)and different times(0.5,2,3.5,5,6.5 min)by low temperature plasma.The titratable acid content,turbidity,△E value,VC content,total phenol content,malondialdehyde content,chlorophyll content,pH value,POD and APX activity were determined,and analyzed the effect of different voltages and different times on the quality of cloudy kiwi juice.The results showed that low temperature plasma treatment had a significant effect on MDA content and△E value in cloudy kiwi juice(P<0.05);Soluble solids content,soluble sugar content,titratable acid content,pH value did not change significantly with time and voltage(P>0.05);Turbidity,VC content,total phenol content and chlorophyll content were significantly reduced(P<0.05);APX activity increased first and then decreased after low temperature plasma treatment;POD activity did not change significantly with the increase of voltage,but increased significantly with the extension of time and then decreased significantly(P<0.05).Low temperature plasma has certain effect on the quality of cloudy kiwi juice,and different voltage and different time treatments have different mechanism on each index.When using low-temperature plasma to sterilize cloudy kiwi juice,appropriate technological parameters should be selected to ensure the sterilization effect while retaining as much nutrition as possible.