RP-School of Pure and Applied Sciences

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Browsing RP-School of Pure and Applied Sciences by Author "Achola, K. J."

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    Aromatic plants of Kenya: volatile constituents of leaf oils of Sphaeranthus suaveolens (Forsk) D.C. and S. bullatus Mattf
    (The International Centre of Insect Physiology and Ecology (ICIPE), 1998) Hassanali, Ahmed; Mwangi, J. W.; Achola, K. J.; Lwande, W.
    The essential oils isolated by hydrodistillation from Sphaeranthus su av eolens (Forsk) D.C. (0.47%) and S. bullatus Mattf. (0.5%) were analyzed by GC and GC-MS. Seventy eight compounds consisting about 95% of the oil of S. suaveolens were identified while 97 constituents accounting for about 83% were identified from the leaf oil of S. bullatus, The major constituents of the leaf oil of S. sauveolens was cis-pinocamphone (63.5 %) while those of S. bullatus oil were thymol (22.0%), bornyl acetate (8.1%) and germacrene-D (7.9%).
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    Constituents of the essential oil of blumea brevipes (oliv. & hiern) willd
    (John Wiley & Sons, Ltd, 1994) Hassanali, Ahmed; Mwangi, J. W.; Achola, K. J.; Lwande, W.; Laurent, R.
    The composition of the essential oil of Blumea brevipes (Oliv. & Hiern) Willd. isolated by hydrodistillation was analysed by GC and GC-MS. Sixty-eight compounds constituting about 94% of the oil were identified. The main components were terpinen-4-ol (27.6%), germacrene-D (15.4%), sabinene (8.0%) and α-terpinene (5.5%). The essential oil composition of B. brevipes presented here (terpinenol-germacrene-type) is different from that of other Blumea/Laggera species.
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    Essential Oil Constituents of Sphaeranthus cyathuloides O. Hoffm.
    (Taylor & Francis, 1995) Hassanali, Ahmed; Mwangi, J. W.; Achola, K. J.; Laurent, R.; Lwande, W.
    Essential oil from the leaves of Sphaeranthus cyathuloides O. Hoffm. was examined by GC and GC/MS. The oil (2.9%) was found to contain trans-dihydrocarvone (67%) and cis-dihydrocarvone (26%) and some small amounts of isodihydrocarveol and neoisodihydrocarveol and limonene. The flower oil contained only small amounts of trans-dihydrocarvone (0.3%) and cis-dihydrocarvone (0.6%).
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    Volatile Constituents of Essential Oil of Tarconanthus camphoratus L.
    (Taylor & Francis, 1994) Hassanali, Ahmed; Mwangi, J. W.; Achola, K. J.; Lwande, W.; Laurent, R.
    The leaf oil of Tarconanthus camphoratus (Compositae) was analyzed by GC and GC/MS. Sixty compounds representing ca. 95% of the oil were identified. The major components were α-fencyl alcohol (29.1%), 1,8-cineole (16.5%) and α-terpineol (8.5%).