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Détail de l'auteur
Auteur B. R. Rajeswara Rao
Documents disponibles écrits par cet auteur
Affiner la rechercheComparative 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)
[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 Essential oil profiles of different parts of palmarosa (Cymbopogon martinii (Roxb.) wats. var. motia burk.) / B. R. Rajeswara Rao in The journal of essential oil research, Vol. 21 N° 6 (Novembre/Décembre 2009)
[article]
in The journal of essential oil research > Vol. 21 N° 6 (Novembre/Décembre 2009) . - pp. 519-521
Titre : Essential oil profiles of different parts of palmarosa (Cymbopogon martinii (Roxb.) wats. var. motia burk.) Type de document : texte imprimé Auteurs : B. R. Rajeswara Rao, Auteur ; D. K. Rajput, Auteur ; R. P. Patel, Auteur Article en page(s) : pp. 519-521 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Palmarosa Cymbopogon martinii var. motia Poaceae Essential oil composition Oil yield Linalool Geraniol Geranyl acetate (E,Z)-farnesol Index. décimale : 646 Résumé : Essential oils distilled from whole herb, leaf lamina, leaf sheath and inflorescence of palmarosa plants cultivated in south India were analyzed by GC and GC/MS.
Inflorescence (2.00%) and leaf lamina (1.40%) produced significantly higher oil yield than whole herb (0.75%) and leaf sheath (0.33%). Palmarosa stem did not produce oil.
Seventeen constituents accounting for 95.6–97.1% of the oils were identified. (E)-β-Ocimene (1.2–4.3%), linalool (0.8–2.0%), geraniol (70.1–85.3%), geranyl acetate (4.3–14.8%) and (E,Z)-farnesol (1.6–3.4%) were the major components.
Whole herb oil was richer in linalool, β-caryophyllene and (E,Z)-farnesol. Leaf lamina and leaf sheath oils were richer in geraniol.
Inflorescence oil was richer in (E)-β-ocimene and geranyl acetate.
To the best of the authors’ knowledge, this is the first report on the oil profiles of leaf lamina and leaf sheath of palmarosa.DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.jeoronline.com/archive/detail/42#top [article] Essential oil profiles of different parts of palmarosa (Cymbopogon martinii (Roxb.) wats. var. motia burk.) [texte imprimé] / B. R. Rajeswara Rao, Auteur ; D. K. Rajput, Auteur ; R. P. Patel, Auteur . - pp. 519-521.
Génie Chimique
Langues : Anglais (eng)
in The journal of essential oil research > Vol. 21 N° 6 (Novembre/Décembre 2009) . - pp. 519-521
Mots-clés : Palmarosa Cymbopogon martinii var. motia Poaceae Essential oil composition Oil yield Linalool Geraniol Geranyl acetate (E,Z)-farnesol Index. décimale : 646 Résumé : Essential oils distilled from whole herb, leaf lamina, leaf sheath and inflorescence of palmarosa plants cultivated in south India were analyzed by GC and GC/MS.
Inflorescence (2.00%) and leaf lamina (1.40%) produced significantly higher oil yield than whole herb (0.75%) and leaf sheath (0.33%). Palmarosa stem did not produce oil.
Seventeen constituents accounting for 95.6–97.1% of the oils were identified. (E)-β-Ocimene (1.2–4.3%), linalool (0.8–2.0%), geraniol (70.1–85.3%), geranyl acetate (4.3–14.8%) and (E,Z)-farnesol (1.6–3.4%) were the major components.
Whole herb oil was richer in linalool, β-caryophyllene and (E,Z)-farnesol. Leaf lamina and leaf sheath oils were richer in geraniol.
Inflorescence oil was richer in (E)-β-ocimene and geranyl acetate.
To the best of the authors’ knowledge, this is the first report on the oil profiles of leaf lamina and leaf sheath of palmarosa.DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.jeoronline.com/archive/detail/42#top