Table 2.
Radical scavenging and antioxidant compounds activity of Rheum emodi
| Fraction | IC50 (μg/mL) |
|---|---|
| DPPH radical scavenging | |
| Myricitrin | 28.46±2.82b |
| Myricetin 3-galloylrhamnoside | 26.66±0.73ab |
| Myricetin | 1.50±0.31a |
| Ascorbic acid | 64.24±0.43c |
| ABTS+ radical scavenging | |
| Myricitrin | 137.55±4.72d |
| Myricetin 3-galloylrhamnoside | 120.32±1.29c |
| Myricetin | 102.01±3.01b |
| Ascorbic acid | 91.55±3.69a |
| SOD activity | |
| Myricitrin | 15.74±2.12c |
| Myricetin 3-galloylrhamnoside | 8.18±1.04b |
| Myricetin | 4.06±0.52a |
| Ascorbic acid | 73.43±3.27d |
Values are presented as mean±standard deviation. Values within a column followed by different letters (a-d) are significantly different (P<0.05).
Ascorbic acid was used as a positive control.
IC50, the half-maximal inhibitory concentration; DPPH, 2,2-diphenyl-1-picrylhydrazyl; ABTS, 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid); SOD, superoxide dismutase.