共查询到18条相似文献,搜索用时 109 毫秒
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液态食品高压脉冲电场灭菌效应 总被引:5,自引:0,他引:5
本文采用高压脉冲电场方法对液态食品进行灭菌处理,结果表明:液态食品中微生物的存活率随电场强度、处理时间和脉冲次数的增加而下降,高压脉冲电场对S.cerevisiae和E.coli的灭菌效果较好,而A.flavus的存活率较高;同时微生物存活率与其浓度无明显相关。并就食品高压脉冲电场灭菌进行了讨论。 相似文献
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对比研究了高压脉冲电场(PEF)处理和高温短时巴氏杀菌(HTST)对鲜榨胡萝卜汁品质和内源酶活力的影响.两种杀茵处理方式对胡萝卜汁的pH值、总酸度、可溶性固形物含量、还原糖含量影响不显著.在PEF(30 kV/cm,500μs)条件处理下,胡萝卜汁色泽、黏度均未发生显著变化,而总酚和类胡萝卜素总量均有所提高.在HTST... 相似文献
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高压脉冲电场非热处理技术因处理时间短、温升小、能耗低和杀菌效果明显等成为目前杀菌工艺中研究最为活跃的技术之一,而且在功能物质提取与保持物质活性等方面也展现了较好的应用前景。着重就高压脉冲电场对食品中的一些生物大分子如酶类、蛋白质等的影响进行综述。 相似文献
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Ou Yun Xin‐An Zeng Charles S. Brennan Liu Zhi‐wei 《International Journal of Food Science & Technology》2017,52(2):424-430
The effect of culture temperature on the conformation of membrane lipid of Salmonella Typhimurium as well as their pulsed electric field (PEF) resistance was investigated. Results revealed that S. Typhimurium cells cultured at relatively lower temperature (10 and 25 °C) were more easily inactivated by PEF treatment than those cultured at relatively higher temperature (37 and 45 °C). Using a Weibull model, it was determined that the PEF treatment time to inactivate 90% S. Typhimurium cells cultured at 45 °C was almost fourfold compared to those cultured at 10 °C. Results of micro‐Raman spectroscopy indicated that as the culture temperature increased, the order degree of C–C and lateral packing order of membrane lipid chain also increased, resulting in a drop in the membrane fluidity. These results are important in considering the use of heat and PEF to inactivate microbe contaminants in food. 相似文献
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Roman Buckow Stefanie Schroeder Paul Berres Pascal Baumann Kai Knoerzer 《Journal of food engineering》2010,101(1):67-77
Pulsed electric field (PEF) processing is a novel mild treatment for pumpable foods preservation at low or moderate temperatures. The electric field strength and the temperature distribution in the treatment chamber have been identified as the key processing parameters affecting the treatment efficacy and possibly the sensorial and nutritional quality of the food. A full 3D computational fluid dynamics (CFD) model of a pilot-scale PEF system with co-linear configuration of the electrodes was developed. The model couples the fluid dynamics and the electrical field and can be used to predict the liquid’s flow pattern, electric field distribution, temperature increase, and residence time in the treatment chamber. A total of 48 process conditions with different settings of applied voltage V, pulse length τ, pulse repetition rate (frequency) f and flow rate in combination with four different inlet temperatures were simulated for a model liquid food (NaCl solutions with two different electrical conductivities) and whole milk. The simulated PEF energy dissipated into the liquids was between 4 and 66 kJ/kg and process temperatures ranged from approximately 25 to 80 °C. The predicted temperature data agree well (R2 > 0.99) with experimental measurements in five locations of the treatment chamber using fibre optic probes. 相似文献