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Comparative chemical composition of steam-distilled and water-soluble essential oils of south american marigold (Tagetes minuta L.) / B. R. Rajeswara Rao in The journal of essential oil research, Vol. 18 N° 6 (Novembre-Décembre 2006) 

Public ISBD [article]  in The journal of essential oil research > Vol. 18 N° 6 (Novembre-Décembre 2006) . - pp. 622-626 Titre : Comparative chemical composition of steam-distilled and water-soluble essential oils of south american marigold (Tagetes minuta L.) Type de document : texte imprimé Auteurs : B. R. Rajeswara Rao, Auteur ; P. N. Kaul, Auteur ; A. K. Bhattacharya, Auteur Année de publication : 2006 Article en page(s) : pp. 622-626 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Tagetes  minuta  Asteraceae  Distillation  procedures  Water-soluble  oil  Essential  oil  composition  (Z)-β-ocimene  Dihydrotagetone  (E)-β-ocimene  Geraniol  Linalyl  acetate Résumé : Flowering shoot biomass of feld-grown South American marigold (Tagetes minuta L.) was hydrodistilled in Clevenger-type apparatus, steam-distilled in a feld distillation unit and the distillation water was collected. Chemical profles of hydrodistilled, steam-distilled and water-soluble (recovered from the distillation water of feld distillation unit employing hexane as the solvent) essential oils were analyzed by GC and GC/MS. The solubility of T. minuta oil in cold water at room temperature (30° C), in hot water (80° C) and the effciencies of hydrodistillation and hexane methods for isolating dissolved oil in water were studied under laboratory conditions. The solubility of the oil ranged from 0.11% in cold water to 0.15% in hot water. Hydrodistillation recovered 33.3–36.7% of dissolved oil in hot water and 55.0–60.0% of dissolved oil in cold water. Hexane extraction recovered 82.7–83.3% of dissolved oil in hot water and 90.0–90.5% of dissolved oil in cold water. Hydrodistilled and steam-distilled oils were richer in mono-and sesquiterpene hydrocarbons, while the water-soluble oil was richer in oxygenated monoterpenes (83.1–93.5%). Hydrodistilled and steam-distilled oils contained (Z)-β-ocimene (13.6–42.2%), dihydrotagetone + (E)-β-ocimene (14.8–30.3%), (Z)-tagetone (7.1–11.9%), (Z)-ocimenone (3.7–5.9%) and (E)-ocimenone (1.8–12.7%) as their major constituents. The main components of the water-soluble oil were: dihydrotagetone + (E)-β-ocimene (3.9–6.8%), (Z)-tagetone (6.2–7.9%), (E)-ocimenone (10.7–13.0%) and geraniol + linalyl acetate (47.5–52.0%). ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2006.9699184#.UXKRU0qC5mM [article] Comparative chemical composition of steam-distilled and water-soluble essential oils of south american marigold (Tagetes minuta L.) [texte imprimé] / B. R. Rajeswara Rao, Auteur ; P. N. Kaul, Auteur ; A. K. Bhattacharya, Auteur . - 2006 . - pp. 622-626. Génie Chimique Langues : Anglais (eng) in The journal of essential oil research > Vol. 18 N° 6 (Novembre-Décembre 2006) . - pp. 622-626 Mots-clés : Tagetes  minuta  Asteraceae  Distillation  procedures  Water-soluble  oil  Essential  oil  composition  (Z)-β-ocimene  Dihydrotagetone  (E)-β-ocimene  Geraniol  Linalyl  acetate Résumé : Flowering shoot biomass of feld-grown South American marigold (Tagetes minuta L.) was hydrodistilled in Clevenger-type apparatus, steam-distilled in a feld distillation unit and the distillation water was collected. Chemical profles of hydrodistilled, steam-distilled and water-soluble (recovered from the distillation water of feld distillation unit employing hexane as the solvent) essential oils were analyzed by GC and GC/MS. The solubility of T. minuta oil in cold water at room temperature (30° C), in hot water (80° C) and the effciencies of hydrodistillation and hexane methods for isolating dissolved oil in water were studied under laboratory conditions. The solubility of the oil ranged from 0.11% in cold water to 0.15% in hot water. Hydrodistillation recovered 33.3–36.7% of dissolved oil in hot water and 55.0–60.0% of dissolved oil in cold water. Hexane extraction recovered 82.7–83.3% of dissolved oil in hot water and 90.0–90.5% of dissolved oil in cold water. Hydrodistilled and steam-distilled oils were richer in mono-and sesquiterpene hydrocarbons, while the water-soluble oil was richer in oxygenated monoterpenes (83.1–93.5%). Hydrodistilled and steam-distilled oils contained (Z)-β-ocimene (13.6–42.2%), dihydrotagetone + (E)-β-ocimene (14.8–30.3%), (Z)-tagetone (7.1–11.9%), (Z)-ocimenone (3.7–5.9%) and (E)-ocimenone (1.8–12.7%) as their major constituents. The main components of the water-soluble oil were: dihydrotagetone + (E)-β-ocimene (3.9–6.8%), (Z)-tagetone (6.2–7.9%), (E)-ocimenone (10.7–13.0%) and geraniol + linalyl acetate (47.5–52.0%). ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2006.9699184#.UXKRU0qC5mM