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Essential oil in leaves and inflorescences of silphium integrifolium michx / Radosław Kowalski in The journal of essential oil research, Vol. 17 N° 2 (Mars-Avril 2005) 

Public ISBD [article]  in The journal of essential oil research > Vol. 17 N° 2 (Mars-Avril 2005) . - pp. 220-222 Titre : Essential oil in leaves and inflorescences of silphium integrifolium michx Type de document : texte imprimé Auteurs : Radosław Kowalski, Auteur ; Janusz Wierciński, Auteur ; Marek Mardarowicz, Auteur Année de publication : 2006 Article en page(s) : pp. 220-222 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Silphium  integrifolium  Asteraceae  Essential  oil  composition  α-pinene Résumé : The content and chemical composition of the essential oil obtained from the leaves and inflorescences of Silphium integrifolium Michx. were studied. The oil content in the leaves and inflorescences was 0.27% and 0.31% v/w, respectively. Qualitative and quantitative analyses of distilled oils were made using GC and GC/MS. It was found that the oils had similar qualitative compositions but they differed quantitative. The main constituents in the leaf and inflorescence oils were α-pinene (9.8% and 14.0%), trans-verbenol (2.7% and 6.3%), bornyl acetate (2.2% and 7.0%), allo-aromadendr-9-ene (4.3% and 6.1%) and caryophyllene oxide (8.7% and 4.7%). ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2005.9698881 [article] Essential oil in leaves and inflorescences of silphium integrifolium michx [texte imprimé] / Radosław Kowalski, Auteur ; Janusz Wierciński, Auteur ; Marek Mardarowicz, Auteur . - 2006 . - pp. 220-222. Génie Chimique Langues : Anglais (eng) in The journal of essential oil research > Vol. 17 N° 2 (Mars-Avril 2005) . - pp. 220-222 Mots-clés : Silphium  integrifolium  Asteraceae  Essential  oil  composition  α-pinene Résumé : The content and chemical composition of the essential oil obtained from the leaves and inflorescences of Silphium integrifolium Michx. were studied. The oil content in the leaves and inflorescences was 0.27% and 0.31% v/w, respectively. Qualitative and quantitative analyses of distilled oils were made using GC and GC/MS. It was found that the oils had similar qualitative compositions but they differed quantitative. The main constituents in the leaf and inflorescence oils were α-pinene (9.8% and 14.0%), trans-verbenol (2.7% and 6.3%), bornyl acetate (2.2% and 7.0%), allo-aromadendr-9-ene (4.3% and 6.1%) and caryophyllene oxide (8.7% and 4.7%). ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2005.9698881

The chemical composition of essential oils and lipophilic extracts of silphium integrifolium michx. and silphium trifoliatum L. rhizomes / Radosław Kowalski in The journal of essential oil research, Vol. 20 n°3 (Mai/Juin 2008) 

Public ISBD [article]  in The journal of essential oil research > Vol. 20 n°3 (Mai/Juin 2008) . - pp. 255-259 Titre : The chemical composition of essential oils and lipophilic extracts of silphium integrifolium michx. and silphium trifoliatum L. rhizomes Type de document : texte imprimé Auteurs : Radosław Kowalski, Auteur Année de publication : 2008 Article en page(s) : pp. 255-259 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Silphium  integrifolium  Silphium  trifoliatum  Asteraceae  Anatomical  structure  Essential  oil  composition  Extract  composition  Modhephene  α-isocomene  Allo-aromadendr-9-ene  β-himachalene Résumé : An anatomical evaluation of the secretory structures of Silphium integrifolium and S. trifoliatum rhizomes as well as GC-FID and GC/MS of the essential oil compositions and lipophilic extracts from organs of both species collected in 1999–2001. It was found that sesquiterpene compounds such as α-isocomene, modhephene, 7β-H-silphiperfol-5-ene, β-caryophyllene, β-isocomene, germacrene D, 7α-H-silphiperfol-5-ene, silphiperfol-6-ene and β-bisabolene were the main components of the tested oils and extracts from S. integrifolium and S. trifoliatum. Among the oils and extracts analyzed, signifcant amounts of allo-aromadendr-9-ene as well as α- and β-himachalene were found only in S. integrifolium rhizome oil. The main constituent of lipophilic extracts that was absent in the oils was 16-acetoxycarterochaetol at average content of 39.7±1.0% and 40.5±5.9% in tested extracts. ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2008.9700005 [article] The chemical composition of essential oils and lipophilic extracts of silphium integrifolium michx. and silphium trifoliatum L. rhizomes [texte imprimé] / Radosław Kowalski, Auteur . - 2008 . - pp. 255-259. Génie Chimique Langues : Anglais (eng) in The journal of essential oil research > Vol. 20 n°3 (Mai/Juin 2008) . - pp. 255-259 Mots-clés : Silphium  integrifolium  Silphium  trifoliatum  Asteraceae  Anatomical  structure  Essential  oil  composition  Extract  composition  Modhephene  α-isocomene  Allo-aromadendr-9-ene  β-himachalene Résumé : An anatomical evaluation of the secretory structures of Silphium integrifolium and S. trifoliatum rhizomes as well as GC-FID and GC/MS of the essential oil compositions and lipophilic extracts from organs of both species collected in 1999–2001. It was found that sesquiterpene compounds such as α-isocomene, modhephene, 7β-H-silphiperfol-5-ene, β-caryophyllene, β-isocomene, germacrene D, 7α-H-silphiperfol-5-ene, silphiperfol-6-ene and β-bisabolene were the main components of the tested oils and extracts from S. integrifolium and S. trifoliatum. Among the oils and extracts analyzed, signifcant amounts of allo-aromadendr-9-ene as well as α- and β-himachalene were found only in S. integrifolium rhizome oil. The main constituent of lipophilic extracts that was absent in the oils was 16-acetoxycarterochaetol at average content of 39.7±1.0% and 40.5±5.9% in tested extracts. ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2008.9700005