Table 1.
Phytochemical content of methanolic leaf extracts of G. alypum, G. punctata, G. cordifolia and G. meridionalis obtained by ultrasound-assisted extraction (mean values ± SD, n = 3).
| Constituents * | G. alypum | G. punctata | G. cordifolia | G. meridionalis |
|---|---|---|---|---|
| Antidiabetic Potential | ||||
| Total phenolics a | 130.46 ± 5.99 A | 98.50 ± 1.23 C | 111.35 ± 3.30 B | 123.44 ± 0.77 A |
| Flavonoids b | 30.43 ± 0.29 C | 48.49 ± 2.37 A | 36.54 ± 1.45 B | 39.72 ± 0.60 B |
| Iridoids c | 27.49 ± 3.08 D | 343.33 ± 4.88 A | 311.23 ± 6.20 B | 247.37 ± 2.70 C |
| Condensed tannins d | 3.00 ± 0.06 D | 4.07 ± 0.11 C | 10.02 ± 0.28 A | 6.21 ± 0.11 B |
| Anticancer Potential | ||||
| Total phenolics a | 131.39 ± 2.89 B | 152.69 ± 4.87 A | 157.31 ± 4.29 A | 159.82 ± 2.34 A |
| Flavonoids b | 32.26 ± 1.37 C | 63.03 ± 0.72 A | 42.23 ± 0.67 B | 43.57 ± 0.50 B |
| Iridoids c | 12.07 ± 0.18 D | 440.04 ± 8.73 A | 290.82 ± 7.49 C | 310.25 ± 4.30 B |
| Condensed tannins d | 2.66 ± 0.09 C | 7.71 ± 0.25 B | 8.76 ± 0.08 A | 8.88 ± 0.27 A |
* Content expressed as: a mg gallic acid equivalents (GAE)/g dry extract (DE); b mg quercetin equivalents (QE)/g DE; c mg aucubin equivalents (AE)/g DE; d mg catechin equivalents (CE)/g DE; different capital letters indicate significant differences between variables (p < 0.05): A > B > C > D.