| In vitro: |
| Parasitol. Res., 2008, 102(6):1119-27. | | The use of microfluorometric method for activity-guided isolation of antiplasmodial compound from plant extracts.[Pubmed: 18214539 ] | In vitro antiplasmodial activity of methanolic extracts of 16 medicinal plants was evaluated by fluorometric assay using PicoGreen.
METHODS AND RESULTS:
The IC50s, as determined by parasite DNA concentration, ranged from <11 to >200 and <13 to >200 microg/ml for Plasmodium falciparum 3D7 and K1, respectively; and the most active extracts were those from Anogeissus leiocarpus and Terminalia avicennoides (<11-> or =14 microg/ml). Aqueous, butanolic, ethyl acetate, and methanolic fractions of these two extracts revealed butanolic fraction to have a relatively better activity (IC50, 10-12 microg/ml). Activity-guided chromatographic separation of the butanolic fraction on Sephadex LH-20 followed by nuclear magnetic resonance and correlation high-performance liquid chromatography revealed the presence of known hydrolysable tannins and some related compounds-castalagin, ellagic acid, flavogallonic acid, punicalagin, Terchebulin, and two other fractions.
CONCLUSIONS:
The IC50s of all these compounds ranged between 8-21 microg/ml (8-40 microM) against both the strains. Toxicity assay with mouse fibroblasts showed all the extracts and isolated compounds to have IC50 > or = 1500 microg/ml, except for Momordica balsamina with <1500 microg/l. All the extracts and isolated compounds did not affect the integrity of human erythrocyte membrane at the observed IC50s. However, adverse effects manifest in a concentration-dependent fashion (from IC50 > or = 500 microg/ml). | | J. Wood Sci., 2013, 59(5):426-31. | | Anti-acne activity of tannin-related compounds isolated from Terminalia laxiflora[Reference: WebLink] | In our investigation to find out new anti-acne agent, we focused on Terminalia laxiflora Engl & Diels (Combretaceae) methanolic wood extract, which has been selected during previous screening experiments for anti-acne agents, which included 29 species of Sudanese medicinal plants.
METHODS AND RESULTS:
Based on the biologically guided fractionation using an antibacterial assay against Propionibacterium acnes, a lipase inhibitory assay and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity assay; five tannin-related compounds were isolated, such as ellagic acid, flavogallonic acid dilactone, Terchebulin and gallic acid. Terchebulin showed good antibacterial activity; minimum inhibitory concentration (MIC) = 125 μg/ml and minimum bactericidal concentration (MBC) = 250 μg/ml. Gallic acid exhibited lipase inhibitory activity with IC50 value of 149.3 μM, which showed strong inhibition compared with Terchebulin, IC50 260.7 μM. However, all compounds exhibited better or equal DPPH radical scavenging activity to (+)-catechin as positive control. Ellagic acid and Terchebulin showed the best DPPH radical scavenging activities, IC50 4.86 and 4.90 μM, respectively.
CONCLUSIONS:
This study demonstrated that Terchebulin has potentiality as an anti-acne agent. |
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