Rapid Quantification of Oxidized and Reduced Forms of Glutathione Using Ortho phthalaldehyde in Cultured Mammalian Cells In Vitro GSH GSSG Glo Assay Measure Ratio of GSH to GSSG Promega Rapid and effective protocol to measure glutathione peroxidase activity Bulletin of the National Research Centre Springer Nature Link Rapid and effective protocol to measure glutathione peroxidase activity Bulletin of the National Research Centre Springer Nature Link Identification of glutathione transferase (GST P1) inhibitors via a high throughput screening assay and implications as alternative treatment options for breast cancers PLOS One The optimised method of HPLC analysis of glutathione allows to determine the degree of oxidative stress in plant cell culture ScienceDirect