Table 2.
Total Phenolics (TP), flavan-3-ols (PRO), and antioxidant activity (ORAC) determination in a commercial sample of U. tomentosa under various solvent and temperature conditions.
| Experiment | MeOH:H2O | T (°C) | TP 1,4,5 | PRO 2,4,5 | ORAC 3,4,5 |
|---|---|---|---|---|---|
| 1 | 90:10 | 100 | 32.4a ± 1.8 | 45.2 a ± 1.9 | 1.47 a ± 0.26 |
| 2 | 90:10 | 60 | 31.8 a ± 2.1 | 48.3 a ± 1.4 | 1.14 a ± 0.24 |
| 3 | 70:30 | 60 | 32.1 a ± 1.8 | 41.1 a ± 5.3 | 1.20 a ± 0.22 |
| 4 | 70:30 | 100 | 32.7 a ± 3.3 | 46.7 a ± 5.5 | 1.08 a ± 0.09 |
| 5 | 80:20 | 80 | 32.4 a ± 0.1 | 47.2 a ± 2.1 | 1.47 a ± 0.27 |
| 6 | 80:20 | 80 | 31.7 a ± 2.8 | 49.1 a ± 4.8 | 1.39 a ± 0.36 |
| 7 | 80:20 | 80 | 31.8 a ± 2.6 | 47.2 a ± 5.2 | 1.54 a ± 0.04 |
1 mg of gallic acid equivalent/g; extract 2. mg cyanidin chloride equivalents/g; extract 3. µmol TE/mg extract 4. Values are expressed as mean ± standard deviation (S.D.). 5 Different superscript letters in the same column indicate differences are significant at p < 0.05.