Glutathione Reductase(GR) Determination Reagent is an in vitro diagnostic quantitative test kit. Glutathione reductase is a flavoprotein that catalyzes thereduction of glutathione disulfide to reduced glutathione with the participation of NADPH as electron donor. Glutathione reductasehas a key role in the antioxidant system. In the cell, glutathione reductaseis one of a chain of enzymes which serves to maintain glutathione in thereduced form. Reduced glutathione plays an important role in the cellularcontrol of reactive oxygen species.