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Comparison of headspace analysis of volatile constituents with GCMS analysis of hydrodistilled and supercritical fluid extracted oil of Capillipedium parviflorum / Rikki Saini in The journal of essential oil research, Vol. 24 N° 3 (Juin 2012) 

Public ISBD [article]  in The journal of essential oil research > Vol. 24 N° 3 (Juin 2012) . - pp. 315-320 Titre : Comparison of headspace analysis of volatile constituents with GCMS analysis of hydrodistilled and supercritical fluid extracted oil of Capillipedium parviflorum Type de document : texte imprimé Auteurs : Rikki Saini, Auteur ; Vikas Jaitak, Auteur ; Shailja Guleria, Auteur Année de publication : 2012 Article en page(s) : pp. 315-320 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Capillipedium  parviflorum  Poaceae  Sc-CO2  Hydrodistillation  Headspace  analysis  Comparative  evaluation Résumé : Volatile constituents of the aerial parts of Capillipedium parviflorum were studied by two different extraction procedures, hydrodistillation (HD), supercritical CO2 extraction (Sc-CO2) and compared with headspace analysis (HS). Sc-CO2 extraction was carried out using nine differential optimization extractions (DOX) at different temperatures (°C) and pressures (MPa), i.e. 35/9, 60/9, 85/9, 35/17, 60/17, 85/17, 35/25, 60/25 and 85/25, to assess the influence on the yield and composition of volatile constituents. In DOX experiments, oil yields varied between 0.01–0.18% and maximum yield (0.18%) was obtained using temperatures and pressures 35/17 and 85/25. The oil is characterized by distinctive presence of very high content of non-terpenes (90.7%) identified in HD oil, 84.0% in Sc-CO2 oil and 92.5% in HS analysis. Monoterpenes were represented in low concentrations in HD oil and were totally absent in Sc-CO2 as well as in HS analysis. Very little variability was observed in the oxygenated monoterpenes in both Sc-CO2 and HD oil representing a low percentage of constituents. Sesquiterpene hydrocarbons were represented between 1.5% and 3.1% in Sc-CO2 extraction, which was higher in comparison with HD and HS techniques. Oxygenated sesquiterpenes were represented in higher percentage in Sc-CO2 than in HD oil and HS analysis. Variability among the major constituents of 4-nonanone, 4-nonanol, 4-undecanone and 4-undecanol was observed in Sc-CO2 extraction carried out under varied temperatures and pressures. Their percentage also varied in HD and HS analysis. 4-Nonanone (2.5%, 60/9 in Sc-CO2; 6.4% in HD and 4.3% in HS), 4-nonanol (21.5% in Sc-CO2, 31.7% in HD and 29.5% in HS), 4-undecanone (33.3%, 85/9 in Sc-CO2; 35.3% in HD and 44.5% in HS) and 4-undecanol (16.5%, 84/17, 60/25 in Sc-CO2; 14.6% in HD and 10.3% in HS) dominated the volatile constituents. ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/full/10.1080/10412905.2012.677141 [article] Comparison of headspace analysis of volatile constituents with GCMS analysis of hydrodistilled and supercritical fluid extracted oil of Capillipedium parviflorum [texte imprimé] / Rikki Saini, Auteur ; Vikas Jaitak, Auteur ; Shailja Guleria, Auteur . - 2012 . - pp. 315-320. Génie Chimique Langues : Anglais (eng) in The journal of essential oil research > Vol. 24 N° 3 (Juin 2012) . - pp. 315-320 Mots-clés : Capillipedium  parviflorum  Poaceae  Sc-CO2  Hydrodistillation  Headspace  analysis  Comparative  evaluation Résumé : Volatile constituents of the aerial parts of Capillipedium parviflorum were studied by two different extraction procedures, hydrodistillation (HD), supercritical CO2 extraction (Sc-CO2) and compared with headspace analysis (HS). Sc-CO2 extraction was carried out using nine differential optimization extractions (DOX) at different temperatures (°C) and pressures (MPa), i.e. 35/9, 60/9, 85/9, 35/17, 60/17, 85/17, 35/25, 60/25 and 85/25, to assess the influence on the yield and composition of volatile constituents. In DOX experiments, oil yields varied between 0.01–0.18% and maximum yield (0.18%) was obtained using temperatures and pressures 35/17 and 85/25. The oil is characterized by distinctive presence of very high content of non-terpenes (90.7%) identified in HD oil, 84.0% in Sc-CO2 oil and 92.5% in HS analysis. Monoterpenes were represented in low concentrations in HD oil and were totally absent in Sc-CO2 as well as in HS analysis. Very little variability was observed in the oxygenated monoterpenes in both Sc-CO2 and HD oil representing a low percentage of constituents. Sesquiterpene hydrocarbons were represented between 1.5% and 3.1% in Sc-CO2 extraction, which was higher in comparison with HD and HS techniques. Oxygenated sesquiterpenes were represented in higher percentage in Sc-CO2 than in HD oil and HS analysis. Variability among the major constituents of 4-nonanone, 4-nonanol, 4-undecanone and 4-undecanol was observed in Sc-CO2 extraction carried out under varied temperatures and pressures. Their percentage also varied in HD and HS analysis. 4-Nonanone (2.5%, 60/9 in Sc-CO2; 6.4% in HD and 4.3% in HS), 4-nonanol (21.5% in Sc-CO2, 31.7% in HD and 29.5% in HS), 4-undecanone (33.3%, 85/9 in Sc-CO2; 35.3% in HD and 44.5% in HS) and 4-undecanol (16.5%, 84/17, 60/25 in Sc-CO2; 14.6% in HD and 10.3% in HS) dominated the volatile constituents. ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/full/10.1080/10412905.2012.677141