Abstract
Flavonoids are widely found in plants and many of them possess biological and pharmacological activities. In the present study, we assessed the effects of the flavonoids Genistein, Apigenin, Quercetin, Rutin and Astilbin on xanthine oxidase (XO) activities in vitro, and in serum and the liver. The effects of the flavonoids on serum uric acid levels were also measured in vivo. In vitro studies indicated that the flavonoids tested did not significantly affect XO activity. However, significant increases and decreases in XO activities were observed in vivo. Moreover, serum XO activity was correlated with serum uric acid levels, while no correlation was observed for liver XO activity. The present study showed that serum uric acid levels in mice treated with the flavonoids tested here are higher than control levels. Therefore, the flavonoids tested here are not candidates for replacing Allopurinol as a treatment to reduce serum uric acid levels.
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