1. Detection of Escherichia coli by capillary electrophoresis assisted by large volume sample stacking and nicking endonuclease signal amplification.
- Author
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Chu, Zhaohui, Chen, Jingyi, Zhang, Jingzi, Xie, Qihui, Zhang, Fan, and Wang, Qingjiang
- Subjects
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ESCHERICHIA coli , *CAPILLARY electrophoresis , *LASER-induced fluorescence , *BACTERIAL DNA , *PATHOGENIC bacteria , *FOODBORNE diseases , *DETECTION limit - Abstract
• A capillary electrophoresis method was developed for the rapid detection of E. coli. • The method based on online sample enrichment and offline signal amplification. • This method had a low detection limit of 3 CFU·mL−1 for E. coli. • The method was applied to bacterial detection in food samples. Efficient, accurate and economical detection of pathogenic bacteria is crucial in ensuring food safety and preventing foodborne illnesses. In this study, a capillary electrophoresis coupled laser-induced fluorescence assay (CE-LIF) was developed for the detection of Escherichia coli (E. coli) by detecting its specific DNA. The CE-LIF was assisted by both online enrichment and offline amplification to improve the detection sensitivity of bacterial DNA. Here the online amplification was performed by large volume sample stacking (LVSS), while the offline amplification was nicking endonuclease signal amplification (NESA). Under the optimal experimental conditions, the detection limit of bacterial target DNA was 2.5 fM, and the conversion concentration of E. coli was 3 CFU · mL−1. The method had been applied to the detection of commercially available skim milk samples with good results, which proved that it could be used as an effective tool for food and environmental bacteria monitoring. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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