红花籽油/火龙果浆乳液的低温等离子体杀菌及贮藏稳定性

Low temperature plasma sterilization and storage stability of safflower seed oil/dragon fruits juice emulsion

目的:促进红花籽油的深度开发。方法:以杀菌率为指标,利用响应面试验优化红花籽油/火龙果浆乳液的低温等离子体(LTP)杀菌工艺条件,并比较热杀菌(80℃、20 min)和LTP杀菌的乳液在贮藏期间的理化指标(维生素C和花青素含量、粒径和ζ电位、过氧化值和酸价)的变化。结果:优化的LTP杀菌工艺条件为极距5.1 cm、处理电压6.4 kV、处理时间151.0 s,该条件下杀菌率达98.2%。贮藏20 d后,LTP处理的红花籽油/火龙果浆乳液的维生素C和花青素成分的保留率高于热处理样品,粒径小于热处理样品,ζ电位大于热处理样品。结论:LTP处理不仅能够有效杀灭红花籽油/火龙果浆乳液中的微生物,且较热处理更有利于红花籽油/火龙果浆乳液品质的保持,是一种红花籽油/火龙果浆乳液杀菌的新方法。

Objective:This study aimed to promote the deep development of safflower seed oil.Methods:Taking sterilization rate as an index,safflower seed oil/dragon fruits juice emulsion was treated by different processing distance,voltage and time.Response surface methodology was used to establish the conditions for low temperature plasma(LTP)sterilization of emulsion.The changes of physicochemical indexes(vitamin C and anthocyanin content,particle size andζpotential,peroxide value and acid value)during storage were compared between thermal sterilization(at 80℃for 20 min)and LTP sterilization.Results:The optimized process conditions of LTP sterilization were treatment distance at 5.1 cm and voltage of 6.4 kV for 151.0 s.Under the control of these conditions,the sterilization rate reached 98.2%.After storage for 20 days,the retention rate of vitamin C and anthocyanin in LTP-treated emulsion was higher than that in heat-treated emulsion,and the particle size was smaller than that in heat-treated emulsion;Theζpotential was higher than that in heat-treated emulsion,and the difference was significant(P<0.05).However,the difference of peroxide value and acid value was not significant.Conclusion:LTP treatment can not only effectively kill the microorganisms in the emulsion,but also maintain the quality of emulsion better than heat treatment,and the invention relates to a new method for sterilizing the safflower seed oil/dragon fruits juice emulsion.