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Water-soluble ZnCuInSe quantum dots for bacterial classification, detection, and imaging

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Abstract

Bacteria are everywhere and pose severe threats to human health and safety. The rapid classification and sensitive detection of bacteria are vital steps of bacterial community research and the treatment of infection. Herein, we developed optical property–superior and heavy metal–free ZnCuInSe quantum dots (QDs) for achieving rapid discrimination of Gram-positive/Gram-negative bacteria by the naked eye; driven by the structural differences of bacteria, ZnCuInSe QDs are effective in binding to Gram-positive bacteria, especially Staphylococcus aureus (S. aureus), in comparison with Gram-negative bacteria and give discernable color viewed by the naked eye. Meanwhile, based on its distinctive fluorescence response, the accurate quantification of S. aureus was investigated with a photoluminescence system in the concentration ranges of 1 × 103 to 1 × 1011 CFU/mL, with a limit of detection of 1 × 103 CFU/mL. Furthermore, we demonstrated the feasibility of ZnCuInSe QDs as a fluorescence probe for imaging S. aureus. This simple strategy based on ZnCuInSe QDs provides an unprecedented step for rapid and effective bacterial discrimination, detection, and imaging.

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Funding

We gratefully acknowledge the National Natural Science Foundation of China (Grant Nos. 21874038, 21605090) for financial support.

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Authors and Affiliations

  1. State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, Hunan, China

    Hongchao Geng, Yan Qiao, Ning Jiang, Chenyi Li, Xingqi Zhu & Qingyun Cai

  2. College of Chemistry and Environmental Engineering, Pingdingshan University, Pingdingshan, 467000, Henan, China

    Weili Li

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  1. Hongchao Geng
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  2. Yan Qiao
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  4. Chenyi Li
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Correspondence to Weili Li or Qingyun Cai.

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Geng, H., Qiao, Y., Jiang, N. et al. Water-soluble ZnCuInSe quantum dots for bacterial classification, detection, and imaging. Anal Bioanal Chem 412, 8379–8389 (2020). https://doi.org/10.1007/s00216-020-02974-1

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  • DOI: https://doi.org/10.1007/s00216-020-02974-1

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