期刊
FOOD CONTROL
卷 107, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodcont.2019.106817
关键词
Escherichia coli; Particle size; Red pepper powder; Thermal inactivation kinetics; Mathematical modeling
资金
- National Key Research and Development Program of China [2017YFD0400901, 2018YFD0700100]
- General Program of National Natural Science Foundation of China [31772031]
Contaminated condiments with low water activity (a(w)) have encouraged the scientific community to study effective thermal methods of inactivating pathogens. The aim of this study was to identify whether microbial thermotolerance in red pepper powder was affected by water activity, treatment temperature and particle size of samples. Effects of three bacterial strains and particle size on the heat resistance were analyzed based on the orthogonal experiment method. Samples with particle size ranging from 0.45 to 1.00 mm and the most thermal resistance bacterial strain of Escherichia coli ATCC 25922 after comparing with two salmonella strains were chosen to study thermal inactivation kinetics in red pepper powder at three a(w) levels with four temperatures. The results indicated an increase of microbial thermal resistance with increasing mean particle sizes of red pepper powder. Logarithmic microbial inactivation was fitted by primary models in which the lower a(w) and temperature resulted in larger D values. Mafart's modified Bigelow model combined with primary models provided acceptable predictions of microbial inactivation performance under the given test conditions. When a(w) levels were higher, E. coli ATCC 25922 was easier to kill at relatively lower temperatures. These findings may assist pepper powder manufacturers and regulatory agencies in designing effective pasteurization processes to ensure product safety.
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