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A nanoprobe for ratiometric imaging of glutathione in living cells based on the use of a nanocomposite prepared from dual-emission carbon dots and manganese dioxide nanosheets

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Abstract

A ratiometric fluorescence assay for glutathione (GSH) was developed. The novel assay is based on a nanoprobe composed of manganese dioxide nanosheets (MnO2 NS) and dual-emission carbon dots (de-CDs) with intrinsic GSH-response property. After construction of the nanoprobe, two emission peaks of de-CDs were suppressed to varying degrees by MnO2 NS. The suppression was relieved and the two emission peaks recovered proportionally when MnO2 NS was decomposed by GSH, thus realizing the ratiometric assay for micromolar GSH. The intrinsic responsiveness of de-CDs to millimolar GSH broadens the analytical range of the nanoprobe. An appropriate precursor, calcon-carboxylic acid, was screened out to synthesize de-CDs via one-step hydrothermal treatment. The de-CD@MnO2 NS nanoprobe can measure GSH concentrations through the fluorescence intensity ratio between 435 and 516 nm excited at 365 nm. The range of response was from 1 μM to 10 mM and the detection limit reached 0.6 μM (3σ criterion). Benefiting from its good biocompatibility, the proposed nanoprobe has excellent applicability for intracellular GSH imaging.

Graphical abstract

Schematic representation of glutathione (GSH) ratiometric detection. The nanoprobe is prepared from dual-emission carbon dots (de-CDs) and manganese dioxide nanosheets (MnO2 NS). GSH removes quenching effect by decomposing MnO2 NS and induces intrinsic response of de-CDs, which realizes ratiometric detection.

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Funding

This study was funded by the National Natural Science Foundation of China (Grant No. 21804143 and No. 21576295), the Hunan Provincial Natural Science Foundation of China (2019JJ50759), and the Fundamental Research Funds for the Central Universities of Central South University (2017zzts175 and 2018zzts371).

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, People’s Republic of China

    Zhiwei Deng, Xiufang Li, Hui Liu, Yao He, Jie Zhang, Jing Yuan, Peiru Gao, Xuling Jiang, Yanjing Yang & Shian Zhong

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  1. Zhiwei Deng
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  2. Xiufang Li
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  3. Hui Liu
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  4. Yao He
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  7. Peiru Gao
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  8. Xuling Jiang
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Correspondence to Yanjing Yang or Shian Zhong.

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Deng, Z., Li, X., Liu, H. et al. A nanoprobe for ratiometric imaging of glutathione in living cells based on the use of a nanocomposite prepared from dual-emission carbon dots and manganese dioxide nanosheets. Microchim Acta 187, 537 (2020). https://doi.org/10.1007/s00604-020-04495-1

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