Browsing by Author "Hailu Solomon"

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    Flavonoids and Essential Oils of T. vulgaris and T. schimperi
    (Addis Ababa Universty, 1997-03) Hailu Solomon; Dagne Ermias (PhD)
    The essential oils of the leaves of Thymus species ( I vulgaris and T. schimperi) grown in different parts of Ethiopia were investigated using GC and GC-MS. The results indicated that T. vulgaris was rich in thymol (>40%) while the components of the oil of T. schimperi grown in different regions vary considerably. The major components of T. schimperi obtained from Dinshu, Maichew and Science Faculty Arobertum were thymol (42-50%) linalool (30%) and carvacrol (44%) respectively. Plant material purchased from Debre Sina was similar in its composition with that from Dinshu. Solvent extraction of the aerial parts of T. vulgaris yielded the flavonoids naringenin and eriodicytol. Their structures were determined by spectroscopic methods