Abundance and composition of these metabolites varied significantly across different parts of plant. For example, the abundance of chalcones (12-16) decreased as follows: root bark (10.51 mg/g) > stems (8.52 mg/g) > leaves (2.63 mg/g) > root cores (1.44 mg/g). The chalcones were found to be responsible for the xanthine oxidase (XO) inhibition shown by this plant. The most potent inhibitor, xanthoangelol inhibited XO with an IC50 of 8.5 μM. Chalcones (12-16) exhibited mixed-type inhibition characteristics. © 2013 Elsevier Ltd. All rights reserved.