Define the Enzyme Function of Vitamin C?

Vitamin C acts as an electron donor for 11 enzymes. Three of those enzymes are found in fungi but not in humans. Of the eight remaining  human enzymes, three participate in collagen hydroxylation and two in carnitine  biosynthesis; of the three enzymes which participate in collagen hydroxylation,  one is necessary for biosynthesis of the catecholamine norepinephrine, one is  necessary for amidation of peptide hormones, and one is involved in tyrosine  metabolism.