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A highly sensitive point-of-care detection platform for Salmonella typhimurium by integrating magnetic enrichment and fluorescent CsPbBr3@SiO2

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Abstract

A platform was designed based on Fe3O4 and CsPbBr3@SiO2 for integrated magnetic enrichment-fluorescence detection of Salmonella typhimurium, which significantly simplifies the detection process and enhances the working efficiency. Fe3O4 served as a magnetic enrichment unit for the capture of S. typhimurium. CsPbBr3@SiO2 was employed as a fluorescence-sensing unit for quantitative signal output, where SiO2 was introduced to strengthen the stability of CsPbBr3, improve its biomodificability, and prevent lead leakage. More importantly, the SiO2 shell shows neglectable absorption or scattering towards fluorescence, making the CsPbBr3@SiO2 exhibit a high quantum yield of 74.4%. After magnetic enrichment, the decreasing rate of the fluorescence emission intensity of the CsPbBr3@SiO2 supernatant at 527 nm under excitation light at UV 365 nm showed a strong linear correlation with S. typhimurium concentration of 1 × 102~1 × 108 CFU∙mL−1, and the limit of detection (LOD) reached 12.72 CFU∙mL−1. This platform has demonstrated outstanding stability, reproducibility, and resistance to interference, which provides an alternative for convenient and quantitative detection of S. typhimurium.

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Funding

This work was supported by the Natural Scientific Foundation of Shandong (nos. ZR2023MC039, ZR2020ZD13 and ZR2022JQ07), the Fundamental Research Funds for the Central Universities (no. 21CX06014A), and the Taishan Scholarship of Shandong Province (no. tsqn202211080).

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  1. Yanxue Shang and **ling Wang contributed equally to this work.

Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, State Key Laboratory of Chemical Safety, China University of Petroleum (East China), Qingdao, 266580, China

    Yanxue Shang, **ling Wang, Hongkun **a, Chunpeng Jiao, **gwen Li & **gbin Zeng

  2. Lahore College for Women University, Lahore, Pakistan

    Nafisa Javaid

  3. Department of Laboratory Medicine, Bei**g Tongren Hospital, Capital Medical University, Bei**g, 100730, China

    **angyi Liu

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  1. Yanxue Shang
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Shang, Y., Wang, J., **a, H. et al. A highly sensitive point-of-care detection platform for Salmonella typhimurium by integrating magnetic enrichment and fluorescent CsPbBr3@SiO2. Microchim Acta 191, 303 (2024). https://doi.org/10.1007/s00604-024-06361-w

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