3.2. Solvent effects on antioxidant activities
3.2.1. TAA
The TAA of the extract was calculated based on the formation of the phosphomolybdenum complex. This activity was measured spectrophotometrically at 695 nm [15] and expressed as equivalents of ascorbic acid. Fig. 1 shows the TAA of extracts in a concentration-dependent manner. The extract of 100% ethanol gave the highest TAA, followed by the extracts of 100% acetone, 100% methanol, 75% aqueous acetone, 75% aqueous methanol, 50% aqueous acetone, 50% aqueous ethanol, and 50% aqueous methanol. The TAA of the water extract is the lowest and is significantly different from that of the others (p < 0.05). The TAA of the 100% ethanol extract is higher than that of the 100% acetone extract. However, both extracts show significantly higher TAA than that of the other extracts (p < 0.05). By contrast, TAAs of the other extracts do not show significant difference from each other