Effects of pulse polarity and pulse delaying time on pulsed electric fields-induced pasteurization of E. coli O157:H7
Effects of pulse polarity and pulse delaying time on pulsed electric fields-induced pasteurization of E. coli O157:H7
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DOI：
10.1016/j.jfoodeng.2004.06.001
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发表时间：
2005-05-01
影响因子：
5.5
通讯作者：
Zhang, QH
中科院分区：
文献类型：
--
作者：
Evrendilek, GA;Zhang, QH
测定了脉冲极性和脉冲延迟时间对接种到苹果汁和脱脂牛奶样品中的大肠杆菌 O157:H7 灭活的影响。当接种的食品样品受到单极和双极方波脉冲作用时，观察到灭活效果。还应用了具有不同脉冲延迟时间的双极脉冲。单极(2.56 log(10) cfu/ml)和双极(2.63 log(10) cfu/ml)脉冲对接种到苹果汁中的大肠杆菌O157:H7的灭活没有显着差异(P > 0.05)。然而。脱脂牛奶中的结果显示，单极脉冲 (1.27 log(10) cfu/ml) 和双极脉冲 (1.96 log(10) cfu/ml) 之间存在显着差异，其中双极脉冲的效率明显更高 (P < 0.05)。不同脉冲延迟时间中，20μs对苹果汁和脱脂牛奶的灭活率显着高于其他脉冲延迟时间（P < 0.05）。 (C) 2004 Elsevier Ltd. 保留所有权利。
Effects of pulse polarity and pulse delaying time on inactivation of E. coli O157:H7 inoculated into apple juice and skim milk samples were determined. Inactivation effect was observed as inoculated food samples were subjected to mono and bipolar square wave pulses. Bipolar pulses with different pulse delaying times were also applied. There was no significant difference between mono (2.56 log(10) cfu/ml) and bipolar (2.63 log(10) cfu/ml) pulses on the inactivation of E. coli O157:H7 inoculated into apple juice (P > 0.05). However. results in skim milk yielded a significant difference between mono (1.27 log(10) cfu/ml) and bipolar (1.96 log(10) cfu/ml) pulses with bipolar pulses being significantly more efficient (P < 0.05). Among different pulse delaying times, 20 mus caused a significantly higher inactivation than the others (P < 0.05) in apple juice and skim milk. (C) 2004 Elsevier Ltd. All rights reserved.