In vitro: |
Trop Biomed. 2014 Mar;31(1):143-8. | Comparative antioxidant and antiplasmodial activities of 11-O-galloylbergenin and bergenin isolated from Bergenia ligulata.[Pubmed: 24862054] | In the present study, the antioxidant and antiplasmodial activities of bergenin was compared with its natural derivative 11-O-Galloylbergenin for the first time.
METHODS AND RESULTS:
Both compounds were isolated from Bergenia ligulata. 11-O-Galloylbergenin was found to be very active in in-vitro antioxidant assay as compared to bergenin, which was found to be almost inactive. The EC50 values of 11-O-Galloylbergenin were 7.45±0.2 μg/mL and 5.39±0.28 μg/mL in DPPH antioxidant assay and reducing power assay respectively, while IC50 value for antiplasmodial assay of both compounds were less than 2.5 μM. Interestingly, in the total antioxidant phosphomolybdate assay, 11-O-Galloylbergenin was found more potent (CAHT: 940.04±115.30) as compared to α-tocopherol (CAHT: 552.4±27.91). | Nat Prod Res. 2015;29(24):2291-4. | Structure activity relationship of bergenin, p-hydroxybenzoyl bergenin, 11-O-galloylbergenin as potent antioxidant and urease inhibitor isolated from Bergenia ligulata.[Pubmed: 25674661] |
METHODS AND RESULTS:
Ethanol extract of the aerial parts of Bergenia ligulata was subjected to solvent-solvent separation followed by various chromatographic techniques that lead to isolation of bergenine (1), p-hydroxybenzoyl bergenin (2), 11-O-Galloylbergenin (3) and methyl gallate (4) as major constituents. Ethyl acetate fraction showed a dose-dependent urease inhibitory pattern with IC50 value of 54μg/mL. Structures of compounds 1 and 3 were established by XRD and 2, 4 by NMR.
CONCLUSIONS:
All these compounds were subjected to DPPH scavenging activity, reducing power assay and urease inhibitory activity. The EC50 7.45 ± 0.2 μg/mL and 5.39 ± 0.28 μg/mL values in terms of antioxidant and reducing power, respectively, were less for 3. Compounds 1-3 showed moderate to significant urease inhibitory potential with IC50 57.1 ± 0.7, IC50 48.4 ± 0.3 and 38.6 ± 1.5. Antioxidant activities and urease inhibitory potential were investigated and compound 3 was found to be the most active. |
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