Votyakova 2004 Arch Biochem Biophys
|Votyakova TV, Reynolds IJ (2004) Detection of hydrogen peroxide with Amplex Red: interference by NADH and reduced glutathione auto-oxidation. Arch Biochem Biophys 431:138-44.|
Abstract: We report here that reduced pyridine nucleotides and reduced glutathione result in an oxidation of Amplex Red by dioxygen that is dependent on the presence of horseradish peroxidase (HRP). Concentrations of NADH and glutathione typically found in biological systems result in the oxidation of Amplex Red at a rate comparable to that produced, for example, by respiring mitochondria. The effects of NADH and glutathione in this assay system are likely to be the result of H(2)O(2) generation via a superoxide intermediate because both catalase and superoxide dismutase prevent the oxidation of Amplex Red. These results suggest caution in the assay of H(2)O(2) production in biological systems using the Amplex Red/HRP because the assay will also report the mobilization of NADH or glutathione. However, the interruption of this process by the addition of superoxide dismutase offers a simple and reliable method for establishing the source of the oxidant signal.
- Komlódi T, Sobotka O, Gnaiger E (2021) Facts and artefacts on the oxygen dependence of hydrogen peroxide production using Amplex UltraRed. Bioenerg Commun 2021.4. https://doi:10.26124/BEC:2021-0004
- Komlodi et al (2022) Hydrogen peroxide production, mitochondrial membrane potential and the coenzyme Q redox state measured at tissue normoxia and experimental hyperoxia in heart mitochondria. MitoFit Preprints 2021 (in prep)
MitoFit 2021 AmR-O2, MitoFit 2021 Tissue normoxia