The TPC values of the extracts range from 6.25 mg GAE/g DFLA for water extract to 40.5 mg GAE/g DFLA for 100%
ethanol extract (Table 1) and they decrease in the following order: 100% ethanol > 100% acetone > 75% aqueous acetone > 75% methanol > 100% methanol > 75% ethanol > 50% ethanol > 50% acetone > 50% methanol > water. The TPC of the 100% ethanol extract is not significantly higher than that of the 100% acetone extract, whereas the TPC of the water extract is significantly less than that of other solvents (p < 0.01). It was also found that the TPC of the extracts decreased with increasing water content in the aqueous solvent except for the methanol system. The TPC of the 75% aqueous methanol extract (35.7 mg GAE/g DFLA) is higher than that of the 100% methanol extract (31.5 mg GAE/g DFLA) and the 50% aqueous extract (20.20 mg GAE/g DFLA). This may be attributable to the content of more nonphenol compounds such as carbohydrate and terpene in water extracts
than in other extracts. It may also be caused by the possible complex formation of some phenolic compounds in the
extract that are soluble in methanol, acetone, and ethanol. These phenolic compounds may possess more phenol groups or have higher molecular weights than the phenolics in the water extract. Based on the results of TPC, the best extracting solvent was ethanol.