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Cheikh-Ali Z.,University Paris - Sud | Adiko M.,University Paris - Sud | Adiko M.,University Cocody Abidjan | Bouttier S.,University Paris - Sud | And 4 more authors.
Chemistry and Biodiversity | Year: 2011

The essential oil from the rhizomes of Aframomum sceptrum (Zingiberaceae) was analyzed by GC/MS, and its major constituents were found to be β-pinene (12.7%), caryophyllene oxide (10.0%), and cyperene (6.0%). The oil was also evaluated for antimicrobial activities, in comparison with β-pinene, caryophyllene oxide, and the leaf essential oil of Melaleuca alternifolia (Myrtaceae). The A. sceptrum essential oil exhibited bacteriostatic activity against the Gram-positive bacteria Bacillus subtilis, Staphylococcus epidermidis, and S. aureus, but not against Gram-negative bacteria. Moreover, it showed mild fungicidal activity against Candida albicans and Aspergillus fumigates, and remarkable antiprotozoal activity against Trypanosoma brucei brucei (MLC of 1.51 μl/ml) and Trichomonas vaginalis (IC50 of 0.12±0.02 and MLC of 1.72 μl/ml). Copyright © 2011 Verlag Helvetica Chimica Acta AG, Zürich.

Cheikh-Ali Z.,University Paris - Sud | Okpekon T.,Laboratoire Of Chimie Organique Biologique | Roblot F.,University Paris - Sud | Bories C.,University Paris - Sud | And 4 more authors.
Phytochemistry Letters | Year: 2011

Two novel labdane diterpenoids, 15ξ-methoxy-labdan-8(17),11(E),13(14)- trien-15,16-olide (1) and 12(S)-hydroxy-15ξ-methoxy-labdan-8(17),13(14)-dien- 15,16-olide (2) were isolated from the rhizomes of Aframomum sceptrum K. Schum (Zingiberaceae). Their structures were established on the basis of their spectroscopic data. Stigmast-4-en-6β-ol-3-one and caryophylene oxide were also obtained. In vitro trypanocidal and leishmanicidal activities of labdanes 1 and 2 were evaluated. Compound 2 exhibited activity similar to that of reference drugs against Leishmania donovani. © 2011 Phytochemical Society of Europe.

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