Table 2.
The effect of season on the antioxidant activities of the ethanol extracts of Hygrophila pogonocalyx Hayata
| Ferrous ion chelating activity (%) | DPPH radical scavenging activity | Total phenol | |
|---|---|---|---|
| μmol EDTA/g DW* | AEAC** | mg GA/100 g DW# | |
| March | 8.3 ± 0.0 c, ## | 2914.0 ± 25.0 bc | 117.5 ± 0.0 c |
| April | 7.4 ± 0.0 c | 2495.5 ± 7.8 d | 91.6 ± 0.0 f |
| May | 57.0 ± 13.3 a | 2727.4 ± 9.2 cd | 98.6 ± 0.0 e |
| June | 17.5 ± 1.2 b | 3175.4 ± 17.8 a | 127.1 ± 0.0 a |
| September | 4.1 ± 0.2 c | 2979.6 ± 356.8 ab | 122.3 ± 0.0 b |
| October | 4.4 ± 0.1 c | 2542.2 ± 43.3 d | 92.3 ± 0.0 f |
| November | 3.3 ± 0.2 c | 2619.8 ± 24.4 d | 106.0 ± 0.0 d |
| December | 2.8 ± 0.1 c | 2896.9 ± 36.6 bc | 118.8 ± 0.1 bc |
*: μmol EDTA/g DW: micromole EDTA equivalents per gram of plant dry weight.
**: Ascorbic acid equivalent antioxidant activity: milligram of ascorbic acid equivalents per 100 g of plant dry weight (mg AA/100 g DW).
#: mg GA/100 g DW: milligrams of gallic acid equivalents per 100 g of plant dry weight.
##: In a single column, means with the same letter are not significantly different according to Duncan’s multiple range tests at the 0.05 level.