期刊
FOOD CONTROL
卷 20, 期 12, 页码 1141-1144出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodcont.2009.03.005
关键词
Listeria; pH; Culturability; VBNC; Acid; Benzoate; Sorbate; Propionate; Acetic
资金
- Society for General Microbiology
Listeria monocytogenes is capable of surviving environmental conditions that are normally fatal to many other bacteria, enabling this pathogen to remain on foods and eventually establish infection after consumption. This study investigated the extent to which L monocytogenes is killed by several weak acids, with particular emphasis on the commonly used food preservative. potassium sorbate. The effects of potassium sorbate were found to be highly pH dependant, with significant killing only observed at a pH of 4.0. At this pH, the order of effectiveness of the acids tested was Na benzoate > Na propionate > acetic acid > K sorbate. Temperature had a significant impact on sensitivity, with K sorbate being effective at 50 mM and elevated (37 degrees C) temperature, but failing to affect survival when cells were at 4 degrees C or 21 degrees C. Finally, we found that cells grown in the presence of K sorbate at pH 4.0 entered a viable but nonculturable (VBNC) state, but became nonviable by 24 h. In contrast, cells incubated under these conditions in the absence of K sorbate entered the VBNC state and maintained viability throughout the 24 h study period. (c) 2009 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据