Stability of ascorbic acid in extracts of iris leaves

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Abstract
The average ascorbic acid content of leaves of several batches of different varieties of Iridaceae was 4.0 mg/g fresh weight or 31 mg/g dry weight. These are some of the highest concentrations recorded for a leaf. The concentration, based on dry weight, was greatest near the base and least at the apex of a leaf. Based on fresh weight, the concentration was almost invariant along the leaf. The oxidase activity of iris leaf towards ascorbic acid was exceptionally low. No evidence for the presence of an inhibitor was obtained, which suggests that the enzyme is present only in low concentration.