Abstract
A sensitive fluorescence strategy was constructed for the detection of α-glucosidase activity based on AgInZnS QDs. The AIZS QDs which were synthesized by hydrothermal method have a fluorescence emission wavelength of 554 nm. Ce4+ was able to oxidize p-phenylenediamine (PPD) to generate oxPPD, which can quench the fluorescence of AIZS QDs through dynamic quenching. When α-glucosidase was introduced into the system, L-ascorbic acid-2-O-α-D-glucopyranosyl (AAG) could be hydrolyzed to form ascorbic acid (AA), which can reduce Ce4+ and prevent the oxidation of PPD. Thus, the dynamic quenching process was blocked accompanying with the fluorescence recovery of AIZS QDs. The developed detection system for α-glucosidase displayed a good linear relationship between 0.01 and 0.16 U·mL−1 with a detection limit of 0.0073 U·mL−1. The sensing platform with high feasibility and anti-interference is a competitive alternative applied to α-glucosidase-related diagnostics.
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Acknowledgements
This work is supported by the National Natural Science Foundation of China (No. 21775052 and No. 21575048), the Science and Technology Development project of Jilin province, China (No. 20180414013GH).
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Zhang, J., Liu, J., Wang, M. et al. A fluorometric assay for α-glucosidase activity based on quaternary AgInZnS QDs. Microchim Acta 188, 227 (2021). https://doi.org/10.1007/s00604-021-04855-5
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DOI: https://doi.org/10.1007/s00604-021-04855-5