4.4 Article

Dual-modal Colorimetric and Fluorometric Method for Glucose Detection Using MnO2 Sheets and Carbon Quantum Dots

Journal

CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
Volume 35, Issue 5, Pages 767-774

Publisher

HIGHER EDUCATION PRESS
DOI: 10.1007/s40242-019-9130-5

Keywords

MnO2; Carbon quantum dot; Colorimetric; Fluorescent; Dual-modal

Funding

  1. National Natural Science Foundation of China [21305032]
  2. Postdoctoral Science Foundation of China [2014M551522, 2018M632238]
  3. Natural Science Foundation of Jiangsu Province, China [BK20160490]
  4. Priority Academic Program Development(PAPD) of Jiangsu Higher Education Institutions, China
  5. Open Research Fund of Henan Key Laboratory of Biomolecular Recognition and Sensing, China [HKLBRSK1803]

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A novel dual-modal fluorometric and colorimetric method was developed for glucose detection using MnO2 sheets and carbon quantum dots(CQDs). The glucose could be oxidized by glucose oxidase, in accompanied with the formation of H2O2 intermediate, which resulted in the decomposition of MnO2 sheets, as well as the MnO2 sheets(brown) changed to Mn2+ ions(colorless), which induced the absorption of MnO2 sheet decreased and the fluorescence of CQDs increased, consequently. The linear detection ranges of glucose are 5-1000 mu mol/L by fluorescent method and 5-60 mu mol/L by colorimetric method. The limits of detection of these two measurements are 2.11 and 2.18 mu mol/L, respectively. This method is easy to conduct, has reasonable sensitive and selectivity, and could be applied for the glucose detection in real human serum.

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