Description_x000D_ Application_x000D_ β-Nicotinamide adenine dinucleotide 2′-phosphate reduced tetrasodium salt has been used in the Griess reagent assay of culture medium to reduce nitrate to nitrite and in glutathione peroxidase assay._x000D_ Biochem/physiol Actions_x000D_ β-Nicotinamide adenine dinucleotide 2′-phosphate (NADP+) and β-Nicotinamide adenine dinucleotide 2′-phosphate, reduced (NADPH) comprise a coenzyme redox pair (NADP+:NADPH) involved in a wide range of enzyme catalyzed oxidation reduction reactions. The NADP+/NADPH redox pair facilitates electron transfer in anabolic reactions such as lipid and cholesterol biosynthesis and fatty acyl chain elongation. The NADP+/NADPH redox pair is used in a variety of antioxidation mechanism where it protects agains reactive oxidation species accumulation. NADPH is generated in vivo by the pentose phosphate pathway (PPP)._x000D_ Preparation Note_x000D_ Chemically reduced_x000D_ Other Notes_x000D_ Packaged based on NADPH content as determined by UV-Vis.