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In enzymology , a NADPH peroxidase is an enzyme that catalyzes the chemical reaction. enzymology. enzymology. enzyme. enzyme. catalyzes. catalysis. chemical reaction. chemical reaction. NADPH. nicotinamide adenine dinucleotide phosphate. NADPH + H + + H2O2 NADP + + 2 H2O. NADPH. nicotinamide adenine dinucleotide phosphate. The 3 substrates of this enzyme are NADPH , H + , and H2O2 , whereas its two products are NADP + and H2O .. enzyme. enzyme. substrates. substrate ( biochemistry ). NADPH. nicotinamide adenine dinucleotide phosphate. products. product ( chemistry ). This enzyme belongs to the family of oxidoreductases , specifically those acting on a peroxide as acceptor -LRB- peroxidases -RRB- .. enzyme. enzyme. The systematic name of this enzyme class is NADPH  : hydrogen-peroxide oxidoreductase .. enzyme. enzyme. NADPH. nicotinamide adenine dinucleotide phosphate. oxidoreductase. oxidoreductase. systematic name. List of enzymes. Other names in common use include TPNH peroxidase , NADP peroxidase , nicotinamide adenine dinucleotide phosphate peroxidase , TPN peroxidase , triphosphopyridine nucleotide peroxidase , and NADPH2 peroxidase .