首页|Loop-mediated isothermal amplification (LAMP) for rapid detection of Salmonella in foods based on new molecular targets

Loop-mediated isothermal amplification (LAMP) for rapid detection of Salmonella in foods based on new molecular targets

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  • NSTL
  • Elsevier
Various molecular techniques have been introduced for Salmonella detection. Loop-mediated isothermal amplification (LAMP) is a simple and easy-to-operate detection method compared with conventional PCR. However, the specificity and efficiency of DNA amplification relies on the selected target sequence. In this study, we aimed to identify new molecular targets and develop a LAMP-based method for the rapid detection of Salmonella in food samples. Using bioinformatics analysis and PCR verification, 3 and 10 molecular targets respectively unique to Salmonella genus and S. enterica were identified. The limit of detection (LOD) for these targets ranged from 2.1 x 10(2) to 2.1 x 10(3) CFU/mL. Of these, the ssaQ gene yielded 100% positive results upon testing with 23 most commonly reported Salmonella serovars and showed no cross-reaction with 22 non-Salmonella strains. Furthermore, its LOD was 2.1 x 10(1) CFU/mL, making it 10-fold more sensitive than the optimal PCR-based method. Therefore, the ssaQ gene was selected as the target gene to detect Salmonella using LAMP. The ability of the ssaQ-based LAMP method of detecting Salmonella in food samples was consistent with that of the standard culture method. The developed method has potential applications in identifying Salmonella contamination in food as well as for rapid and precise tracing of contamination sources in clinical diagnostics.

SalmonellaPan-genome analysisTarget miningPCRLoop-mediated isothermal amplification

Shang, Yuting、Ye, Qinghua、Cai, Shuzhen、Wu, Qingping、Pang, Rui、Yang, Shuanghong、Xiang, Xinran、Wang, Chufang、Zha, Fei、Ding, Yu、Zhang, Yinzhi、Wang, Jiasheng、Sun, Xiulan、Zhang, Jumei

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Jiangnan Univ, Natl Engn Res Ctr Funct Food, Synerget Innovat Ctr Food Safety & Qual Control, State Key Lab Food Sci & Technol,Sch Food Sci & T, Wuxi 214122, Jiangsu, Peoples R China

Guangdong Acad Sci, Guangdong Inst Microbiol, Guangdong Prov Key Lab Microbial Safety & Hlth, State Key Lab Appl Microbiol Southern China, Guangzhou 510070, Peoples R China

Jinan Univ, Dept Food Sci & Technol, Guangzhou 510632, Peoples R China

2021

10.1016/j.lwt.2021.110999

LWT-Food Science & Technology

LWT-Food Science & Technology

ISSN：0023-6438
年,卷(期)：2021.142
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