Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (8): 2412.doi: 10.7503/cjcu20210048

• Analytical Chemistry • Previous Articles     Next Articles

Efficient Determination of Alkaline Phosphatase Activity Based on Graphene Quantum Dots Fluorescent Probes

HUANG Shan1, YAO Jiandong1, NING Gan1, XIAO Qi1(), LIU Yi1,2   

  1. 1.Guangxi Key Laboratory of Natural Polymer Chemistry and Physics,College of Chemistry and Materials,Nanning Normal University,Nanning 530001,China
    2.School of Chemistry and Chemical Engineering,Tiangong University,Tianjin 300387,China
  • Received:2021-01-22 Online:2021-08-10 Published:2021-08-05
  • Contact: XIAO Qi E-mail:qi.xiao@nnnu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21864006);the Natural Science Foundation of Guangxi Province, China(2017GXNSFDA198034)

Abstract:

Based on the static fluorescence quenching effects of benzoquinones on graphene quantum dots(GQDs), a GQDs-based fluorescent probe was established to detect the activity of alkaline phosphatase(ALP). Under the catalytic action of horseradish peroxidase, hydrogen peroxide(H2O2) could generate hydro-xyl radicals(·OH), and ·OH oxidized o-dihydroxybenzene to produce o-benzoquinone subsequently, resul-ting in the fluorescence quenching of GQDs. ALP catalyzed the production of reductive ascorbic acid by ascorbic acid 2-phosphat. Ascorbic acid efficiently removed H2O2 and ·OH from the solution, leading to the inhibition of the production of o-benzoquinone and the fluorescence recovery of GQDs. Therefore, a highly sensitive determination strategy for ALP activity was established. Under the optimal experimental conditions, the detection limit of ALP activity was 0.084 U/L. This method was used to evaluate ALP activity in human serum samples. Such approach can provide theoretical basis for the diagnosis and treatment of ALP-related diseases.

Key words: Graphene quantum dot, Fluorescent probe, Alkaline phosphatase, Static quenching, Enzymatic activity

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