4.7 Article

An all-in-one nucleic acid enrichment and isothermal amplification platform for rapid detection of Listeria monocytogenes

期刊

FOOD CONTROL
卷 139, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.foodcont.2022.109096

关键词

Listeria monocytogenes; Chitosan modified silica membrane; Nucleic acid extraction; Strand exchange amplification; Colorimetric detection

资金

  1. National Natural Science Foundation of China [81801264]
  2. National Key Research and Development Programs of China [2018YFE0113300]
  3. Key Project of Shandong Provincial Natural Science Foundation [ZR2020KH030]

向作者/读者索取更多资源

This study developed an all-in-one platform for rapid and sensitive detection of Listeria monocytogenes. The platform integrates nucleic acid extraction, amplification, and visual detection in a single tube, and achieves high detection sensitivity using specific primers. Additionally, the method simplifies the use of detection equipment.
Listeria monocytogenes is an infectious foodborne pathogen that greatly threatens the public health worldwide. A simple and sensitive detection of L. monocytogenes is extremely important in food safety industry. In this study, we developed an all-in-one platform, which consists of nucleic acid extraction, amplification and visual detection in a single tube. Following a simple bacterial lysis, the released DNA and RNA were highly enriched by a chitosan modified silica membrane (CMSM). Enriched nucleic acids were then directly used for isothermal strand exchange amplification (SEA) and colorimetric detection. The analytical feasibility of this platform was successfully determined by identifying L. monocytogenes with a specific set of primers, and experiments confirmed a detection limit of 1.0 x 102 CFU/mL in pure culture, while the limit of detection in L. monocytogenes spiked pork was 1.0 x 103 CFU/g without bacterial enrichment and 1.0 x 10 degrees CFU/g following 4 h enrichment. The whole SEA assay takes an hour to complete, allows one-step DNA and RNA amplification and substantially improves the assay sensitivity. In addition, the colorimetric-based visual result readout developed in this study fully alleviates the use of sophisticated equipment. Therefore, the proposed method has great potential for rapid and on-site identification of L. monocytogenes in resource-restricted settings.

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