Abstract
This work describes a colorimetric glutathione (GSH) assay that is taking advantage of (a) the peroxidase-like activity of a nanocomposite prepared from platinum nanoparticles and graphene oxide (PtNP/GO), (b) the decolorizing reaction of GSH with oxidized 3,3′,5,5′-tetramethylbenzidine (TMB), and (c) the GSH-induced scavenging of hydroxy radicals produced from H2O2. The assay has a detection limit as low as 4 nM of GSH. It is flexible because it involves a single step reaction. The method was successfully applied to the determination of GSH in hemolyzed human blood. The concentrations determined by this method in GSH-spiked blood samples ranged from 95.0 to 112.5%, with relative standard deviations between 0.5 and 4.2%.
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Acknowledgements
We sincerely acknowledge the financial support of the National Natural Science Foundation of China (21175023, 21675024), the Program for Innovative leading talents in Fujian Province (2016B016), and Joint Funds for the Innovation of Science and Technology, Fujian Province (2016Y9056).
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Xu, HH., Deng, HH., Lin, XQ. et al. Colorimetric glutathione assay based on the peroxidase-like activity of a nanocomposite consisting of platinum nanoparticles and graphene oxide. Microchim Acta 184, 3945–3951 (2017). https://doi.org/10.1007/s00604-017-2429-3
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DOI: https://doi.org/10.1007/s00604-017-2429-3