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Lineweaver-Burk plots of XO inhibitions of compounds with various concentrations of xanthine. Lineweaver-Burk transformed data were plotted and followed by linear regression of the points. Data represent mean of triplicate experiments. (A) caffeic acid; (B) vinyl caffeate; (C) rosmarinic acid; (D) methyl rosmarinate; (E) apigenin.
