Radiofrequency pasteurization against Salmonella and Listeria monocytogenes in cocoa powder

被引：10

作者：

Ballom, Kenneth ^{[1
]}

Dhowlaghar, Nitin ^{[1
]}

Tsai, Hsieh-Chin ^{[1
]}

Yang, Ren ^{[2
]}

Tang, Juming ^{[2
]}

Zhu, Mei-Jun ^{[1
]}

机构：

[1] Washington State Univ, Sch Food Sci, Pullman, WA 99164 USA

[2] Washington State Univ, Dept Biol Syst Engn, Pullman, WA 99164 USA

来源：

LWT-FOOD SCIENCE AND TECHNOLOGY | 2021年 / 145卷

基金：

美国食品与农业研究所;

关键词：

Radiofrequency; Cocoa-powder; Salmonella; Listeria; Enterococcus faecium NRRL B-2354; FAECIUM NRRL B-2354; ESCHERICHIA-COLI O157H7; LOW MOISTURE FOODS; THERMAL INACTIVATION; WATER ACTIVITY; HEATING UNIFORMITY; WHEAT-FLOUR; CORN FLOUR; FREQUENCY; TYPHIMURIUM;

D O I：

10.1016/j.lwt.2021.111490

中图分类号：

TS2 [食品工业];

学科分类号：

0832 ;

摘要：

In this study, thermal processes were developed for cocoa powder against Salmonella and Listeria monocytogenes in a pilot Radiofrequency (RF) unit and validated using their respective surrogates Enterococcus faecium NRRL B2354 and Listeria innocua. For 1.0 kg cocoa powder samples, RF heating to 90 degrees C provided 1.74-1.84 log reduction of E. faecium. A 48 min holding post-RF heating provided an additional 3.65 and 2.24 log10 CFU/g reduction of E. faecium for insulated and non-insulated samples, respectively. Compared to E. faecium, L. innocua was less resistant to RF heating in aw 0.45 cocoa powder; RF heating to 75 degrees C coupled with 24 min insulated holding resulted in an additional 5.64 log10 CFU/g reduction. These data suggested that E. faecium was a conservative surrogate strain for controlling Salmonella and L. monocytogenes during RF processing of cocoa powder. To achieve maximal microbial reduction and improve energy efficiency, an insulated holding following RF heating is highly recommended. According to the predictive line obtained from the Bigelow model, a 7.6 min RF heating plus 48 min insulated holding attained a 5-log reduction of E. faecium without a negative impact on the color of cocoa powder.

引用

页数：8

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