Investigation of the potential direct and cross protection effects of sublethal injured Salmonella Typhimurium induced by radio frequency heating stress

被引：12

作者：

Jiao, Shunshan ^{[1
]}

Zhang, Hangjin ^{[1
]}

Liao, Meiji ^{[1
]}

Hayouka, Zvi ^{[2
]}

Jing, Pu ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Agr & Biol, Minist Agr,SJTU OSU Innovat Ctr Environm Sustaina, Shanghai Food Safety & Engn Technol Res Ctr,Key L, 800 Dongchuan Rd, Shanghai 200240, Peoples R China

[2] Hebrew Univ Jerusalem, Inst Biochem Food Sci & Nutr, Robert H Smith Fac Agr Food & Environm, IL-76100 Rehovot, Israel

来源：

FOOD RESEARCH INTERNATIONAL | 2021年 / 150卷

基金：

中国国家自然科学基金;

关键词：

Pasteurization; Low-moisture foods; Water activity; Fatty acid; Cell morphology; ESCHERICHIA-COLI O157H7; ENTERICA SEROVAR TYPHIMURIUM; FATTY-ACID-COMPOSITION; LISTERIA-MONOCYTOGENES; WATER-ACTIVITY; INACTIVATION KINETICS; STAPHYLOCOCCUS-AUREUS; ENTEROCOCCUS-FAECIUM; ETHANOL ADAPTATION; BACILLUS-CEREUS;

D O I：

10.1016/j.foodres.2021.110789

中图分类号：

TS2 [食品工业];

学科分类号：

0832 ;

摘要：

Many studies demonstrated that radio frequency (RF) was an effective pasteurization method for low-moisture foods (LMFs), and our previous study confirmed RF heating stress generated sublethal injured cells (SICs) of Salmonella enterica serovar Typhimurium (S. Typhimurium) in red pepper powder with initial aw >= 0.53. So this study investigated the potential direct protection and cross protection effects of the SICs of S. Typhimurium to multiple stresses, and analyzed fatty acid composition and cell morphology. Results showed that the SICs were repaired after incubating for 5 h, and there were no obvious direct and cross protection effects by exposing to different external stresses (heat, 15% ethanol, pH 3.0 acid buffer solution, 10% salt). According to the fatty acid composition analysis, no significant difference (p > 0.05) between the ratio of unsaturated to saturated fatty acids (UFA/SFA) was observed for SICs of S. Typhimurium and control cells, indicating the same membrane fluidity which can support the experimental results. This study investigated and confirmed there are no direct and cross protection effects for the SICs of S. Typhimurium induced by RF heating stress, and it would be helpful for deeply understand the response of pathogens under RF heating stress.

引用

页数：8