研究了高压脉冲电场(PEF)对蓝莓汁的杀菌效果及其对蓝莓汁理化性质的影响。结果显示:随电场强度、处理时间的增大,PEF对蓝莓汁中大肠杆菌的杀灭效果增强。当电场强度为35 kV/cm,处理时间为82μs时,蓝莓汁中大肠杆菌致死率为5.12个对数。电场强度一定时,电导率增大,PEF对大肠杆菌的钝化效果略微下降。PEF对蓝莓汁VC、花青素、总酚、可滴定酸、还原糖、可溶性固形物及色泽等理化性质没有影响。

The study evaluated the sterilizing effect of pulsed electric fields(PEF) on Escherichia coli in blueberry juice and its impact on physicochemical property of blueberry juice.The results showed that the inactivation effect of Escherichia coli was enhanced when the electric field strength and total treatment time were increased.With PEF treatments at 35 kV/cm and 82 μs,the reduction of Escherichia coli was 5.12 logarithms.When the electric field strength was constant and the electric conductivity was increased,the inactivation effect of Escherichia coli declined slightly.PEF had no significant effect on the content of vitamin C,anthocyanin,total phenols,titratable acids,reducing sugar,and Brix in blueberry juice and its color.