Rapid Quantification of Oxidized and Reduced Forms of Glutathione Using Ortho phthalaldehyde in Cultured Mammalian Cells In Vitro Assay for quantitative determination of glutathione and glutathione disulfide levels using enzymatic recycling method Nature Protocols PDF) Assay for quantitative determination of glutathione and glutathione disulfide levels using enzymatic recycling method The Key Role of GSH in Keeping the Redox Balance in Mammalian Cells: Mechanisms and Significance of GSH in Detoxification via Formation of Conjugates