Assay for quantitative determination of glutathione and glutathione disulfide levels using enzymatic recycling method Springer Nature Experiments Rapid Quantification of Oxidized and Reduced Forms of Glutathione Using Ortho phthalaldehyde in Cultured Mammalian Cells In Vitro Full article: Comparison of three methods for in vivo quantification of glutathione in tissues of hypertensive rats Assay for quantitative determination of glutathione and glutathione disulfide levels using enzymatic recycling method Nature Protocols