Phenolic compounds, secondary metabolites produced by most plants, are generally responsible for the antioxidant activity of many fruits and vegetables. The Folin–Ciocalteu procedure has been proposed to rapidly estimate the level of TPC in foods and supplements (Prior et al., 2005). The results showed that both solvents showed no significant difference in the ability to extract phenolic compounds (Table 1). The significant difference of the ability appeared between different citrus cultivars. Kaffir lime exhibited the highest TPC of 46.6±1.9 and 39.6±1.9 mg GAE/g for ethyl acetate and ethanol extract, respectively, while Pomelo showed the lowest with no significant difference with Lime.