Rapid Quantification of Oxidized and Reduced Forms of Glutathione Using Ortho phthalaldehyde in Cultured Mammalian Cells In Vitro Simple determination of glutathione by two phase titration Analyst (RSC Publishing) L Glutathione vs. oxidized vs. Reduced Glutathione Identification of glutathione transferase (GST P1) inhibitors via a high throughput screening assay and implications as alternative treatment options for breast cancers PLOS One