Rapid Quantification of Oxidized and Reduced Forms of Glutathione Using Ortho phthalaldehyde in Cultured Mammalian Cells In Vitro Glutathione: Master Antioxidant, Reducing Oxidative Stress, and Detoxification Measurement of Glutathione as a Tool for Oxidative Stress Studies by High Performance Liquid Chromatography Glutathione analysis and quantification in Korean supplements: method development and validation Food Science and Biotechnology Springer Nature Link