Glutathione: Master Antioxidant, Reducing Oxidative Stress, and Detoxification Rapid Quantification of Oxidized and Reduced Forms of Glutathione Using Ortho phthalaldehyde in Cultured Mammalian Cells In Vitro Rapid and effective protocol to measure glutathione peroxidase activity Bulletin of the National Research Centre Springer Nature Link Glutathione Quantification in Live Cells with Real Time Imaging and Flow Cytometry ScienceDirect