A salt or ester of ascorbic acid. ... Ascorbate oxidase, a copper-containing enzyme that catalyses the oxidation of l-ascorbic acid with O2 to l-dehydroascorbic acid. Some forms of ascorbate oxidase use NADP+ as well. Used as an antitumour enzyme. ... Synonym: ascorbase. ... (05 Mar 2000) ... Found on http://www.encyclo.co.uk/local/20973