Abstract
In this study, we developed a simple colorimetric approach to detect glutathione (GSH). The proposed approach is based on the ability of CuS-PDA-Au composite material to catalytically oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) to ox-TMB to induce a blue color with an absorption peak centered at 652 nm. However, the introduction of GSH can result in a decrease in oxidized TMB; similarly, it can combine with Au nanoparticles (Au NPs) on the surface of CuS-PDA-Au composite material. Both approaches can result in a fading blue color and a reduction of the absorbance at 652 nm. Based on this above, we proposed a technique to detect GSH quantitatively and qualitatively through UV-Vis spectroscopy and naked eye, respectively. This approach demonstrates a low detection limit of 0.42 μM with a broad detection range of 5 × 10−7–1 × 10−4 M with the assistance of UV-Vis spectroscopy. More importantly, this approach is convenient and rapid. This method was successfully applied to GSH detection in human serum and cell lines.
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Acknowledgments
We thank the anonymous reviewers for their valuable suggestions.
Funding
This work was supported by a grant from the National Natural Science Foundation of China (21305097) and Two-way Support Plan Foundation of Sichuan Agricultural University.
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The project was approved by the Third People’s Hospital of Chengdu. All experiments were performed in compliance with the relevant laws and institutional guidelines.
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The authors declare that they have no conflict of interest.
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Wang, Y., Liu, Y., Ding, F. et al. Colorimetric determination of glutathione in human serum and cell lines by exploiting the peroxidase-like activity of CuS-polydopamine-Au composite. Anal Bioanal Chem 410, 4805–4813 (2018). https://doi.org/10.1007/s00216-018-1117-4
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DOI: https://doi.org/10.1007/s00216-018-1117-4