Table 1.
Phenolic content and in vitro antioxidant capacity of aqueous rooibos extract
| Aqueous rooibos extract | |
|---|---|
| Constituents | Concentration |
| Soluble solids (mg/mL) | 2.85 ± 0.39 |
| Total polyphenol (mg GAE/mL) | 1.06 ± 0.02 |
| Flavonol (mg QE/ mL) | 0.48 ± 0.01 |
| Flavanol (mg CE/mL) | 0.19 ± 0.01 |
| Aspalathin (μg/mL) | 29.98 ± 0.08 |
| Orientin (μg/mL) | 18.61 ± 0.13 |
| Iso-orientin (μg/mL) | 25.98 ± 0.52 |
| Vitexin (μg/mL) | 6.07 ± 1.05 |
| Iso-vitexin (μg/mL) | 7.18 ± 0.20 |
| Hyperoside/rutin (μg/mL) | 14.55 ± 2.26 |
| Quercetin (μg/mL) | 0.89 ± 0.18 |
| Luteolin (μg/mL) | 0.22 ± 0.06 |
| Chrysoeriol (μg/mL) | 0.25 ± 0.01 |
| ORAC (μmol AAE/mL) | 1.69 ± 0.03 |
| FRAP (μmol TE/mL) | 5.20 ± 0.04 |
| TEAC (μmol TE/mL) | 4.79 ± 0.33 |
Values are mean ± SD. Soluble solid is a mean of 12 determinations while other parameters are mean of 5 determinations. AAE (ascorbic acid equivalent), CE (catechin equivalent), GAE (gallic acid equivalent), QE (quercetin equivalent), TE (trolox equivalent).