Chemical composition and mosquito repellency of essential oil of Conyza newii propagated in different geographical locations of Kenya.
| dc.contributor.author | Hassanali, Ahmed | |
| dc.contributor.author | Mayeku, P. W. | |
| dc.contributor.author | Omollo, N. I. | |
| dc.contributor.author | Odalo, Josiah Ochieng | |
| dc.date.accessioned | 2014-04-08T08:28:23Z | |
| dc.date.available | 2014-04-08T08:28:23Z | |
| dc.date.issued | 2013-11-25 | |
| dc.description | doi: 10.1111/mve.12039. | en_US |
| dc.description.abstract | Previously, essential oil of Conyza newii (Asterale: Asteracea, Oliv. & Hiern) growing in the northern part of West Pokot (35°E, 1°N) of Kenya was shown to be highly repellent [RD50 = 8.9 × 10-5 mg/cm2 , 95% confidence interval (CL)] to Anopheles gambiae s.s. Fumigant toxicity of the oil to the mosquito was also demonstrated. The major constituents of the oil were found to be monoterpenoids, including (S)-(-)-perillyl alcohol, (S)-(-)-perillaldehyde, geraniol, (R)-(+)-limonene, trans-β-ocimene and 1,8-cineol. In this study, the chemical composition and repellency of essential oils of the plant seedlings collected from West Pokot (35°E, 1°N) and propagated in seven different geographical regions of Kenya [West Pokot (35°E, 1°N), Kilome (37°E, 1°S), Naivasha (36°E, 0°), Webuye (34°E, 1°N), Nyakach (34°E, 0°), Kericho (35°E, 0°) and Nairobi (36°E, 1°S)] were compared. There were significant variations (P < 0.01, 95% CL) in the relative proportions of the six constituents and this was reflected in the repellency of the essential oils (P < 0.01, 95% CL). Higher repellency of the oil was associated with greater proportions of (S)-(-) perillyl alcohol, (S)-(-)-perillaldehyde and geraniol, and lower repellency was associated with an increased proportion of (R)-(+)-limonene. The results suggest significant epigenetic (chemotypic) variations in the repellency and composition of C. newii essential oils growing in different regions of Kenya. | en_US |
| dc.identifier.citation | Med Vet Entomol. 2013 Nov 25. | en_US |
| dc.identifier.uri | http://ir-library.ku.ac.ke/handle/123456789/9352 | |
| dc.language.iso | en | en_US |
| dc.publisher | Wiley | en_US |
| dc.subject | Chemotypes | en_US |
| dc.subject | epigenetic variations | en_US |
| dc.title | Chemical composition and mosquito repellency of essential oil of Conyza newii propagated in different geographical locations of Kenya. | en_US |
| dc.type | Article | en_US |