Antitrichomonal and antioxidant activities of Dorstenia barteri and Dorstenia convexa
Braz. j. med. biol. res
;
38(7)July 2005. ilus
Article
in English
| LILACS
| ID: lil-403864
RESUMO
Dorstenia barteri and D. convexa extracts and some isolated components of the former were investigated for effectiveness against Trichomonas gallinarum and compared with quercetin and quercitrin. The antioxidant activity of the extracts/compounds was also determined. The minimum lethal concentrations (MLCs) for the extract of D. barteri leaves and twigs at 24 h were found to be 15.625 and 15.625 æg/ml, respectively. However, the MLCs of the leaf and twig extract of D. convexa were 125 and 437.5 æg/ml, respectively. The prenylated and geranylated chalcones were as active as the prenylated flavones, 6-prenylapigenin and the diprenylated derivative 6,8-diprenyleridictyol. The order of the antitrichomonal activity of the compounds at 24 h was quercetin (0.121 æg/ml) > quercitrin (0.244 æg/ml) > or = bartericin B (0.244 æg/ml) > bartericin A (0.73 æg/ml) > stigmasterol (0.98 æg/ml) > 6,8-diprenyleridictyol = isobavachalcone = dorsmanin F (31.25 æg/ml). D. barteri extracts, quercitrin, and bartericin A, and the prenylated flavonoids had potent antioxidant properties. The twig extract of D. barteri was more potent than the leaf extract. Moderate (EC50 >50 æg/ml) and high (EC50 <50 æg/ml) antioxidant activities were detected in the leaf and twig extracts of D. barteri and the prenylated flavonoids. Prenylated flavonoids and the isolated compounds with antioxidant properties described here may account for the anti-inflammatory action of these extracts. The antitrichomonal and antioxidant activities shown by the extracts and compounds in this study are consistent with the ethnomedicinal and local use of the Dorstenia species studied.
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Index:
LILACS (Americas)
Main subject:
Trichomonas
/
Flavonoids
/
Moraceae
/
Antioxidants
/
Antitrichomonal Agents
Limits:
Animals
Language:
English
Journal:
Braz. j. med. biol. res
Journal subject:
Biology
/
Medicine
Year:
2005
Type:
Article
Affiliation country:
Botswana
/
Cameroon
/
Nigeria
/
South Africa
Institution/Affiliation country:
Obafemi Awolowo University/NG
/
University of Botswana/BW
/
University of Durban-Westville/ZA
/
University of Yaoundé/CM
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