Table 3.
Total polyphenol contents and free radical-scavenging and reducing activities of plant extracts.
| Total Polyphenol Contents (g GAE/100 g) | DPPH Reduced (%) | |
|---|---|---|
| Plants | ||
| A. borbonica | 3.44 ± 0.11 b,c | 89.50 ± 1.24 e |
| A. triplinervis | 0.58 ± 0.02 a,c,d | 67.99 ± 1.58 f |
| T. bentzoe | 8.14 ± 0.27 a,b,d | 92.43 ± 0.42 |
| D. viscosa | 3.22 ± 0.12 b,c | 89.95 ± 1.41 |
| Standard antioxidants | ||
| Vitamin C | - | 93.78 ± 0.65 |
| Caffeic acid | - | 92.58 ± 0.63 |
| Chlorogenic acid | - | 89.36 ± 0.75 e |
| Gallic acid | - | 94.04 ± 0.06 |
| Quercetin | - | 92.56 ± 0.54 |
Total polyphenol contents from medicinal plant extracts were determined by Folin-Ciocalteu assay and expressed as g gallic acid equivalent (GAE)/100 g plant. Free radical-scavenging and reducing capacities of plant polyphenols (100 µM GAE), vitamin C, quercetin, caffeic, chlorogenic and gallic acids (100 µM) were measured by DPPH assay and expressed as % DPPH reduced. Data are means ± SEM of three independent experiments. a: p < 0.005 as compared to A. borbonica, b: p < 0.005 as compared to A. triplinervis, c: p < 0.005 as compared to T. bentzoe, d: p < 0.005 as compared to D. viscosa, e: p < 0.05 and f: p < 0.005 as compared to vitamin C positive control.