Phytochemistry. 2004 Oct;65(20):2797-802.

Repellency of essential oils of some Kenyan plants against Anopheles gambiae.

Omolo MO, Okinyo D, Ndiege IO, Lwande W, Hassanali A.

Source

Chemistry Department, School of Pure and Applied Sciences, Kenyatta University, PO Box 43844, GPO 00100, Nairobi, Kenya.

Abstract

Essential oils of six plants growing in Kenya were screened for repellent activities against Anopheles gambiae sensu stricto. The oils of Conyza newii (Compositeae) and Plectranthus marrubioides (Labiateae) were the most repellent (RD50=8.9 x 10(-5) mg cm(-2), 95% CI) followed by Lippia javanica (Verbenaceae), Lippia ukambensis (Verbenaceae), Tetradenia riparia, (Iboza multiflora) (Labiateae) and Tarchonanthus camphoratus (Compositeae). Eight constituents of the different oils (perillyl alcohol, cis-verbenol, cis-carveol, geraniol, citronellal, perillaldehyde, caryophyllene oxide and a sesquiterpene alcohol) exhibited relatively high repellency. Four synthetic blends of the major components (present in > or = 1.5%) of the essential oils were found to exhibit comparable repellent activity to the parent oils.

PMID:: 15474566; [PubMed - indexed for MEDLINE]

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