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High Contrast Surface Enhanced Fluorescence of Carbon Dot Labeled Bacteria Cells on Aluminum Foil

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Abstract

Surface enhanced fluorescence (SEF) is observed with very high contrast (100–200) from single E. coli bacteria cells labeled with Carbon nanodots (CDs), on aluminum foil and aluminum film. Likely, it is the first application of organic CDs in SEF. SEF with 633 nm excitation delivered a much higher contrast than SEF with 532 nm excitation. Contrast is the ratio of the fluorescent intensities of labeled CDs to unlabeled (control) cells. High contrast with CDs is also observed on the gold film, silicon, and glass. Enhancement factor (EF) is the ratio of the signal on the metal substrate to the signal on the glass. Single E. coli cells, labeled with commercial graphene quantum dots (GCDs), demonstrated higher EFs (44 on gold, 35 on Al film), but at least one order of magnitude lower contrast (7–10 on aluminum and gold) than cells labeled with organic CDs. Therefore, organic CDs can be a good choice for cell imaging/labeling, capable of achieving a signal to noise (standard deviation of the control) as high as 700 on Al film. Overall, aluminum foil and film are highlighted as inexpensive but efficient substrates for Metal Enhanced Fluorescence, particularly MEF of bacterial cells stained with CDs.

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Acknowledgments

This research is supported by the Nazarbayev University Faculty Development Competitive Research grant 090118FD5352 (Kazakhstan). There is no potential conflict of interest pertinent to this research. The authors would like to acknowledge Yunona Bukasova for proofreading the paper.

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Authors and Affiliations

  1. Chemistry Department, SSH, Nazarbayev University, Nur-Sultan, Kazakhstan

    Rostislav Bukasov, Zhanar Kunushpayeva, Alisher Rapikov, Saida Zhunussova & Alisher Sultangaziyev

  2. Biology Department, SSH, Nazarbayev University, Nur-Sultan, Kazakhstan

    Olena Filchakova

Authors
  1. Rostislav Bukasov
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  2. Zhanar Kunushpayeva
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  3. Alisher Rapikov
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  4. Saida Zhunussova
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  5. Alisher Sultangaziyev
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  6. Olena Filchakova
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Correspondence to Rostislav Bukasov.

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Bukasov, R., Kunushpayeva, Z., Rapikov, A. et al. High Contrast Surface Enhanced Fluorescence of Carbon Dot Labeled Bacteria Cells on Aluminum Foil. J Fluoresc 30, 1477–1482 (2020). https://doi.org/10.1007/s10895-020-02610-2

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  • DOI: https://doi.org/10.1007/s10895-020-02610-2

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