 L-ascorbate—cytochrome-b5 reductase

In enzymology, a L-ascorbate—cytochrome-"b"5 reductase () is an enzyme that catalyzes the chemical reaction

Thus, the two substrates of this enzyme are L-ascorbate and ferricytochrome "b"5, whereas its 3 products are monodehydroascorbate, ferrocytochrome "b"5, and H+.This enzyme belongs to the family of oxidoreductases, specifically those acting on diphenols and related substances as donor with a cytochrome as acceptor.