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A validated method to assess glutathione peroxidase enzyme activity

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Abstract

This article presents a reliable, effective and easy procedure for measuring glutathione peroxidase (Gpx) activity. Enzyme samples were incubated with phosphate buffer, which included the appropriate concentrations of glutathione (GSH) and peroxide as substrates, to determine Gpx activity. In the CUPRAC method, the CUPRAC reagent Cu(Nc)22+ was added to stop the enzymatic reaction after a sufficient period of incubation. The unreacted substrates acted to reduce the Cu(II)–neocuproine complex into the strongly coloured Cu(I)–neocuproine complex that could be measured spectrophotometrically at 450 nm. GPx activity was linked to a decrease in the absorbance of the coloured Cu(I)–neocuproine complex. The Box–Behnken design was used to optimise the formation of the Cu(I)–neocuproine complex. Response surface methodology was applied to determine the accuracy of the method. This new protocol was confirmed by performing the Bland–Altman plot analysis of Gpx activity in matched samples through the Gpx–DTNB assay. The correlation coefficient between the two protocols was 0.9967. This result indicated that the new protocol was very accurate and on par with the comparison method.

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Acknowledgements

We thank all of our colleagues for their continuous encouragement and helpful scientific comments.

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  1. Chemistry Dept, College of Science, University of Babylon, Babylon Governorate, p.o., Hilla City, 51002, Iraq

    Ahmed Yasser Ahmed, Saadon Abdulla Aowda & Mahmoud Hussein Hadwan

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  1. Ahmed Yasser Ahmed
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  2. Saadon Abdulla Aowda
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  3. Mahmoud Hussein Hadwan
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Correspondence to Mahmoud Hussein Hadwan.

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Ahmed, A.Y., Aowda, S.A. & Hadwan, M.H. A validated method to assess glutathione peroxidase enzyme activity. Chem. Pap. 75, 6625–6637 (2021). https://doi.org/10.1007/s11696-021-01826-1

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