Table 2.
Amounts of total polyphenols, tannins, flavonoids, and flavonols in the extract from Harpagophytum procumbens root (HPE) dissolved in DMSO (HPEDMSO), 100% v/v EtOH (HPEEtOH100), 50% v/v EtOH (HPEEtOH50), and deionized water (HPEH2O). Data are the mean ± SE of at least three independent experiments with three replicates for each experiment (n = 9).
| Compounds | HPEDMSO | HPEEtOH100 | HPEEtOH50 | HPEH2O |
|---|---|---|---|---|
| µg/mg of Dry Extract (Mean ± SE) | ||||
| Polyphenols (TAE) | 99.6 ± 0.05 ***§ | 69.6 ± 0.05 | 97.9 ± 0.01 ***§ | 84.2 ± 0.04 ** |
| Tannins (TAE) | 14.2 ± 0.02 ** | 9.2 ± 0.04 | 9.2 ± 0.02 | 17.9 ± 0.03 *** |
| Flavonoids (QE) | 113.0± 5.1 ***§§ | 71.3 ± 6.6 §§ | 75.1 ± 6.1 §§ | 37.6 ± 4.3 |
| Flavonols (QE) | 43.8 ± 2.4 ***§§ | 27.6 ± 3.2 | 30.1 ± 2.0 § | 25.1 ± 2.0 |
TAE—tannic acid equivalent. QE—quercetin equivalent. ** p < 0.01 and *** p < 0.01 significantly higher than HPEEtOH100 (ANOVA followed by Bonferroni’s multiple comparison post hoc test). § p < 0.05 and §§ p < 0.01 significantly higher than HPEH2O (ANOVA followed by Bonferroni’s multiple comparison post hoc test).