Antioxidant Therapies in the Treatment of Multiple Sclerosis The glutathione cycle shapes synaptic glutamate activity PNAS GC MS Studies on the Conversion and Derivatization of Glutamyl Peptides to Pyroglutamate (5 Oxo Proline) Methyl Ester Pentafluoropropione Amide Derivatives The Use of Different MS Techniques to Determine Glutathione Levels in Marine Tissues Food Analytical Methods Springer Nature Link