Abstract
A dual-signal photometric/fluorometric assay was established for rapid, qualitative, and quantitative detection of Salmonella typhimurium (S. typhimurium). This method was composed of two parts: (1) a single-step photometric (SSC) assay containing gold nanoparticles (AuNPs), poly-diallyldimethylammonium chloride (PDDA), and S. typhimurium-specific aptamer, and (2) a fluorescence (FL) assay containing carboxyl-modified CdSe/ZnS quantum dots (QDs-COOH). Users just need to drop samples contaminated with S. typhimurium into SSC assay; the apparent color change from red to blue can be observed in a short time (20 min). A smartphone app was developed to read the semiquantitative result. By subsequently adding one drop of FL assay into the reaction mixture, the generated fluorescence intensity reflected the concentration of S. typhimurium. The naked eye limit of detection (LOD) and fluorescent LOD were 103 cfu/mL and 10 cfu/mL, respectively. This method exhibited good selectivity. The reliability and practicability were verified by testing contaminated food, drinking water, and pets’ urine.
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26 July 2022
A Correction to this paper has been published: https://doi.org/10.1007/s00604-022-05369-4
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Acknowledgements
We thank the financial support from the National Natural Science Foundation of China (Grant No. 81872668, 82003505).
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Conceptualization, methodology, investigation, formal analysis, and writing – original draft: Yanli Fu, Jia Wei, and Bo Pang. Methodology: Shuo Yao and Xiangyang Zhuang. Software: Liang Zhang. Resources, funding acquisition, and project administration: Mingrui Zhang and Juan Li. Supervision, validation, writing – review and editing: Bo Pang, Chao Zhao, and Juan Li.
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Fu, Y., Wei, J., Yao, S. et al. Rapid qualitative and quantitative detection of Salmonella typhimurium using a single-step dual photometric/fluorometric assay. Microchim Acta 189, 218 (2022). https://doi.org/10.1007/s00604-022-05312-7
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DOI: https://doi.org/10.1007/s00604-022-05312-7