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Chemical composition of essential oils of Croton hirtus L’Her from Piauí (Brazil) / S.G. De Lima in The journal of essential oil research, Vol. 24 N° 4 (Août 2012) 

Public ISBD [article]  in The journal of essential oil research > Vol. 24 N° 4 (Août 2012) . - pp. 371-376 Titre : Chemical composition of essential oils of Croton hirtus L’Her from Piauí (Brazil) Type de document : texte imprimé Auteurs : S.G. De Lima, Auteur ; L.B.P. Medeiros, Auteur ; C.N.L.C. Cunha, Auteur Année de publication : 2012 Article en page(s) : pp. 371-376 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Croton  hirtus  Euphorbiaceae  Essential  oil  composition  E-caryophyllene  Spathulenol  Germacrene  D  Chemical  variability  Toxicity Résumé : The essential oils from the fresh leaves of Croton hirtus from two locations, Teresina and Simões in Piauí State, located in northeastern Brazil were obtained by hydrodistillation and analyzed by gas chromatography–flame ionization detection (GC–FID) and gas chromatography–mass spectrometry (GC–MS) techniques and further confirmed by 1H and 13C NMR. The main compounds found in the oil of the leaves from C. hirtus collected at Simões were spathulenol (26.7%), E-caryophyllene (10.0%), bicyclogermacrene (9.5%), α-cadinol (7.7%) and cubenol (7.0%). At Teresina, the harvest was carried out in two different months and in three periods of the day, and E-caryophyllene (27.9–37.3%), germacrene D (6.3–33.7%), α-cadinene (7.0–16.1%), δ-cadinene (1.8–13.5%) and α-humulene (3.6–4.6%) were identified as the major constituents. The brine shrimp (Artemia salina Leach) lethality bioassay, carried out to investigate the toxicity of the essential oils, showed 50% lethal concentration (LC50) values of 11.24 and 11.85 μg/mL for samples from Teresina and Simões, respectively. ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/full/10.1080/10412905.2012.692908 [article] Chemical composition of essential oils of Croton hirtus L’Her from Piauí (Brazil) [texte imprimé] / S.G. De Lima, Auteur ; L.B.P. Medeiros, Auteur ; C.N.L.C. Cunha, Auteur . - 2012 . - pp. 371-376. Génie Chimique Langues : Anglais (eng) in The journal of essential oil research > Vol. 24 N° 4 (Août 2012) . - pp. 371-376 Mots-clés : Croton  hirtus  Euphorbiaceae  Essential  oil  composition  E-caryophyllene  Spathulenol  Germacrene  D  Chemical  variability  Toxicity Résumé : The essential oils from the fresh leaves of Croton hirtus from two locations, Teresina and Simões in Piauí State, located in northeastern Brazil were obtained by hydrodistillation and analyzed by gas chromatography–flame ionization detection (GC–FID) and gas chromatography–mass spectrometry (GC–MS) techniques and further confirmed by 1H and 13C NMR. The main compounds found in the oil of the leaves from C. hirtus collected at Simões were spathulenol (26.7%), E-caryophyllene (10.0%), bicyclogermacrene (9.5%), α-cadinol (7.7%) and cubenol (7.0%). At Teresina, the harvest was carried out in two different months and in three periods of the day, and E-caryophyllene (27.9–37.3%), germacrene D (6.3–33.7%), α-cadinene (7.0–16.1%), δ-cadinene (1.8–13.5%) and α-humulene (3.6–4.6%) were identified as the major constituents. The brine shrimp (Artemia salina Leach) lethality bioassay, carried out to investigate the toxicity of the essential oils, showed 50% lethal concentration (LC50) values of 11.24 and 11.85 μg/mL for samples from Teresina and Simões, respectively. ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/full/10.1080/10412905.2012.692908