高强脉冲电场对维生素C的影响研究

Effect of High Intensity Pulsed Electric Fields on Vitamin C Content in Orange Juice

采用自行研制的高强脉冲电场处理设备研究了脉冲场强、流速和电导率对橙汁中维生素C含量的影响情况。结果表明:304μs/cm电导率的橙汁中Vc(维生素C)的含量随着流速的降低而降低,25kV/cm场强下,流速为10mL/min,Vc降到76.47%;Vc含量随着脉冲场强和电导率的增大而减小,25kV/cm场强下,流速为20mL/min,1054μs/cm电导率的橙汁中Vc降到最低:47.60%,橙汁温度上升到最高:68.5℃。

The effects of pulsed electric field （PEF） treatment on the quantity of vitamin C in orange juice were investigated with serf-designed PEF equipment in this paper. The results indicated that the content of vitamin C was reduced with decrease of sample flow velocity. With 25 kV/cm intensity of PEF, vitamin C content was 76.47 % at the flow rate of 10 mL/min. The vitamin C content also decreased with the increase of pulsed strength and conductance, the lowest value of which was 47.60 % with 25 kV/em of intensity, 1054 μs/cm of conductance, and the flow rate of 20 mL/min. Meanwhile, the temperature of orange juice was the highest （68.5℃）.