Application of gaseous ozone to control populations of Escherichia coli, Bacillus cereus and Bacillus cereus spores in dried figs
Application of gaseous ozone to control populations of Escherichia coli, Bacillus cereus and Bacillus cereus spores in dried figs
复制标题
DOI：
10.1016/j.fm.2007.09.007
复制
发表时间：
2008-02-01
影响因子：
5.3
通讯作者：
Ozdemir, Murat
中科院分区：
文献类型：
--
作者：
Akbas, Meltem Yesilcimen;Ozdemir, Murat
研究了臭氧氧化对无花果干中大肠杆菌、蜡状芽孢杆菌和蜡状芽孢杆菌芽胞的去除效果。将干无花果以10(7)g(-1)的微生物量撒在无菌袋中，分别接种大肠杆菌、蜡状芽孢杆菌和蜡状芽孢杆菌，混合后在25℃下干燥1h后进行臭氧氧化。接种的样品在20摄氏度和70%相对湿度的室内暴露在气态臭氧中。分别用0.1、0.5和1.0ppm的臭氧灭活大肠杆菌和蜡样芽孢杆菌360min，用1.0、5.0、7.0和9.0ppm的臭氧处理蜡样R孢子360min。在1.0ppm时，大肠杆菌和蜡样芽孢杆菌的数量减少了3.5对数值。臭氧浓度为360分钟的臭氧处理。在臭氧氧化360分钟结束时，观察到超过1.0ppm臭氧浓度的蜡状芽孢杆菌孢子数量减少了2个对数。臭氧处理后，干无花果的色泽、pH值和含水率均无明显变化。臭氧处理和非臭氧处理的无花果干的甜度、酸败、风味、外观和整体适口性均无明显变化。臭氧处理对减少无花果干中的营养细胞尤其有效，是一种很有前途的无花果干去污方法。(C)2007爱思唯尔有限公司。保留所有权利。
The effect of ozonation as a method to reduce Escherichia coli, Bacillus cereus and Bacillus cereus spores in dried figs was investigated. Dried figs were sprinkle inoculated with E coli, B. cereus and B. cereus spores in sterile bags at a level of 10(7) microorganism g(-1), mixed and allowed to dry for 1 h at 25 degrees C prior to ozonation. Inoculated samples were exposed to gaseous ozone in a chamber at 20 degrees C and 70% relative humidity. Ozone concentrations of 0.1, 0.5 and 1.0 ppm up to 360 min were used to inactivate E. coli and B. cereus while 1.0, 5.0, 7.0 and 9.0 ppm ozone concentrations for 360 min were used to treat R cereus spores. E. coli and B. cereus counts were decreased by 3.5 log numbers at 1.0 ppm. ozone concentration for 360 min ozone treatment. Up to 2 log reductions in the number of B. cereus spores were observed above 1.0 ppm ozone concentration at the end of 360 min of ozonation. No significant changes in color, pH and moisture content values of dried figs were observed after the ozonation treatments. No significant changes were found between sweetness, rancidity, flavor, appearance and overall palatability of ozonated and non-ozonated dried figs. Ozonation was found to be effective especially in reduction of vegetative cells in dried figs and a promising method for the decontamination of dried figs. (C) 2007 Elsevier Ltd. All rights reserved.