l-gulonolactone oxidase

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l-gu·lon·o·lac·tone ox·i·dase

the enzyme that catalyzes the conversion of l-gulonolactone and O2 to H2O2 and l-xylo-hexulonolactone, a precursor of ascorbic acid; absent in humans.
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The objective of this study was to see if supplementation lowered the activity of the enzyme which catalyzes the synthesis of ascorbic acid in the glucose/xylose cycle, L-gulonolactone oxidase (EC 1.