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The xanthine oxidase- (XOD-) inhibitory activity of phytochemicals from Davallia formosana. AP, allopurinol (positive control); 2, 6,8,3′,4′-tetrahydroxyflavanone-7-C-β-d-glucopyranoside; 3, 6,8,4′-trihydroxyflavanone-7-C-β-d-glucopyranosid; 5, epiphyllocoumarin-3-O-β-d-allopyranoside. Each value represents the mean ± SEM of three replicates. *P < 0.05, **P < 0.01, and ***P < 0.001, compared to the positive control.
