Table 1.
Antioxidant activity of fifteen triterpenes, employing the phosphomolybdenum method, and metal-chelating activity on ferrous ion assays.
| Compounds | Phosphomolybenum (mmol TE/g) |
Metal-Chelating (mg EDTAE/g) |
|---|---|---|
| Cycloorbicoside A (1) | 1.82 ± 0.04 | 18.54 ± 0.06 |
| Cycloorbicoside A-7-monoacetate (2) | 2.26 ± 0.22 | 41.00 ± 0.37 |
| 3-O-β-d-Xylopyranoside-(23R,24S)-16β,23;16α,24-diepoxycycloart-25(26)-en-3β,7β-diol 2′,3′,4′,7-tetraacetate (3) | 1.98 ± 0.06 | 18.16 ± 0.72 |
| 3-O-β-d-Xylopyranoside-(23R,24S)-16β,23;16α,24-diepoxycycloart-25(26)-en-3β,7β-diol-7-monoacetate (4) | 1.34 ± 0.01 | 21.88 ± 0.96 |
| 3-O-β-d-Xylopyranoside-(23R,24S)-16β,23;16α,24-diepoxycycloart-25(26)-en-3β,7β-diol (5) | 0.80 ± 0.01 | 15.64 ± 0.28 |
| Cycloalpioside D (6) | 4.05 ± 0.01 | 19.03 ± 0.07 |
| Cycloalpioside D-2′,3′,4′,7-tetraacetate (7) | 1.58 ± 0.16 | 25.38 ± 0.08 |
| Cycloalpioside D-2′,3′,4′-triacetate (8) | 1.78 ± 0.02 | 19.26 ± 0.33 |
| 3-O-β-d-Xylopyranoside-20R-25-norcycloartan-3β,7β,16β-triol-20,24-olide (9) | 0.45 ± 0.02 | 20.19 ± 0.21 |
| Cycloorbicoside B (10) | 1.49 ± 0.17 | 4.68 ± 0.08 |
| Cyclosieversioside E (11) | 1.90 ± 0.16 | 8.33 ± 0.24 |
| Astragaloside IV (12) | 1.30 ± 0.04 | 8.73 ± 0.04 |
| Cyclosieversioside H (13) | 0.83 ± 0.06 | 3.96 ± 0.14 |
| Oleanolic acid (14) | 0.20 ± 0.01 | 3.05 ± 0.14 |
| Ursolic acid (15) | 0.42 ± 0.10 | 30.17 ± 0.07 |
Values are reported as mean ± S.D.; TE: Trolox equivalents; and EDTAE: EDTA equivalents.