高压脉冲电场对绿茶饮料杀菌的研究

Effect of Pulsed Electric Fields on Green Tea Beverage

研究了高压脉冲电场对中性的绿茶饮料的杀菌效果，结果表明，当电场强度达到40kV／cm，处理时间达到120μs时，绿茶饮料中接种的大肠杆菌数量可降低5个对数级以上。此条件下生产的绿茶饮料样品，其茶多酚含量及色泽都无明显变化。

Pulsed electric fields （PEF） is a newly developed nonthermal food preservation technology, which has been successfully applied in acidic fluid foods. In this paper, PEF was applied to the process green tea beverage, a kind of low acidic beverage. The results showed that about 5 logs reduction of E. coli was achieved at 40 kV/cm for 120 microseconds （2μs pulse width, 667pps）. No significant changes in the color, flavor and content of tea polyphenols were observed after PEF treatment.