
Colorimetric and Fluorescence Determination of Glucose Based on Cell-derived Fluorescent Carbon Dots
LIU Yingqi, WANG Yemei, JIANG Kai, ZHENG Fenfen, ZHU Junjie
Colorimetric and Fluorescence Determination of Glucose Based on Cell-derived Fluorescent Carbon Dots
Cell derived fluorescent carbon points(CDs) were synthesized via one step hydrothermal method. It is found that the CDs have excellent peroxide-like catalytic activity, which can catalyze the hydrogen peroxide to produce hydroxyl radical. Based on this, the hydrogen peroxide produced by glucose oxidation and CDs could consecutively oxidize p-phenylenediamine(PPD) to produce PPDox[2,5-Diamino-N,N′-di-(4-aminophenyl)-2,5-cyclohexadiene-1,4-diimine]. By virtue of the inner filer effect of PPDox on CDs, a dual-mode colorimetric and fluorescent detection of glucose was establised. The limit of detection of the present assay are 41 µmol/L and 13 µmol/L for the colorimetric method and the fluorescence method, respectively. In this work, CDs can not only be used as a peroxide-like enzyme to catalyze hydrogen peroxide to produce hydroxyl radical for PPD oxidation, but also be used as a fluorescent indicator to indicate the change of glucose concentration through the internal filtration effect.
Cell derived fluorescent carbon dots / Peroxide-like / Glucose probe
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