• Login
    View Item 
    •   Repository
    • Journal Articles
    • Articles: Department of Physical Sciences
    • View Item
    •   Repository
    • Journal Articles
    • Articles: Department of Physical Sciences
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Chemical composition and mosquito repellency of essential oil of Conyza newii propagated in different geographical locations of Kenya

    Thumbnail
    View/Open
    Abstract (214.0Kb)
    Date
    2014
    Author
    Mayeku, Philip Wafula
    Omollo, N. I.
    Odalo, O. J.
    Ahmed, Hassanali
    Metadata
    Show full item record
    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.
    URI
    http://hdl.handle.net/123456789/922
    Collections
    • Articles: Department of Physical Sciences [59]

    University of Embu©
    Contact Us |
    Designed by 
    Atmire NV
     

     

    Browse

    All of RepositoryCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    University of Embu©
    Contact Us |
    Designed by 
    Atmire NV