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Boswellia frereana resin one of the most important product was collected from a tree endemic to North Somalia, within subcoastal zone from near sea-level up to 750 (-1000). The aim of this study is to investigate oil content, oil physical and chemical properties and oil constituents. Oil content of B.frereana determined by British pharmacopeia, physicochemical properties determined by British standard and Oil constituents by GC/MS chromatography. The results showed that oil content of B.frereana was 7.22, Physical properties of B.frereana; oil colour was yellow, volatilization (volatile at normal temperature), density (0.87g/cm3), refractive index nDt (1.47) and viscosity (96.4), while chemical constituents; acid value (1.97) and ester value 76.6). GC/MS showed 79 compounds; 58 of which are mono terpense (72.5%), 12 sesquiterpenes (15%) and the rest are not identified; The major components were alpha - thujene (18.62), O-cymene (10.55) and alpha - pinene (10.06); the minor components are 13 namely; sabinen (6.99), tetracyclo [10.4.0.0 (2,11). (3,8)] hexadeca - 3 (8), 4, 6, 9 - tetraene - 2 carbonitrile (6.91), D-limonene (5.55), 1, 3 - dimethyl cyclohexene (5.09), alpha - phellendrene (4.91), eucalyptol (3.52), P - cymen - 8 - ol (1.76), cyclofenchene (1.67), pinocarvone (1.52), D - alpha - pinene (1.33), linalool (1.16), alpha - terpinol (1.12) and trans - pinocarveole (1.02). And the other were traces elements. we can conclude that oil content and physicochemical and oils constituents were comparatively as the same as the international standards. Further investigations in bioactivity of B.frereana oil, evaluation phytochemical studies of B.frereana to identify flavonoids, phenolic acids, alkaloids, and ester glycosides Extraction and isolation of bioactive compounds from B.frereana whole extracts are needed; beside formulation of isolated active compounds drugs are also recommended.
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