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Thymus carnosus boiss. / M. Graça Miguel in The journal of essential oil research, Vol. 17 N° 4 (Juillet-Août 2005) 

Public ISBD [article]  in The journal of essential oil research > Vol. 17 N° 4 (Juillet-Août 2005) . - pp. 422-426 Titre : Thymus carnosus boiss. : Effect of harvesting period, collection site and type of plant material on essential oil composition Type de document : texte imprimé Auteurs : M. Graça Miguel, Auteur ; Joao Duarte, Auteur ; A. Cristina Figueiredo, Auteur Année de publication : 2006 Article en page(s) : pp. 422-426 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Thymus  carnosus  Lamiaceae  Harvesting  period  Essential  oil  composition  Borneol  Terpinen-4-ol  Camphene  Cis-sabinene  hydrate Résumé : The essential oils, isolated by hydrodistillation, from the flowers and the remaining aerial parts (leaves plus stems) from three populations of Thymus carnosus Boiss., collected at different harvesting periods and in three collection sites of Portugal (QL, LM and LA) were analyzed by GC and GC/MS. The oil yields from the flowers collected in LA, QL and LM were six, four and one-fold higher, respectively, than the average oil yields from the remaining aerial parts. Monoterpenes were dominant in all oils (>86%), and sesquiterpenes accounted for 1–6% of the total oils. Diterpenes, phenylpropanoids and non-terpenoid compounds were present in all oils (0.1–0.6%, trace amounts and t-0.4%, respectively). Borneol (26–31%) and camphene (9–18%) dominated QL oils and borneol (18–23%), terpinen-4-ol (11–19%) and camphene (8–10%) were the main components of LM oils. LA oils showed high variability in the dominant components, cis-sabinene hydrate (14%), terpinen-4-ol (12%) and borneol (11%) being the main components in the flower oil. Terpinen-4-ol (18%) and borneol (18%) dominated the vegetative phase oil, whereas borneol (21%) and terpinen-4-ol (16%) dominated the aerial parts oils collected in May and July, respectively. QL oils can be classified as a borneol/camphene chemotype and one of the LA samples as borneol/cis-sabinene hydrate/terpinen-4-ol chemotype. However, all the other LM and LA samples do not fi t within the previously defi ned chemotypes. ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2005.9698950#.UchLnmF2_n6 [article] Thymus carnosus boiss. : Effect of harvesting period, collection site and type of plant material on essential oil composition [texte imprimé] / M. Graça Miguel, Auteur ; Joao Duarte, Auteur ; A. Cristina Figueiredo, Auteur . - 2006 . - pp. 422-426. Génie Chimique Langues : Anglais (eng) in The journal of essential oil research > Vol. 17 N° 4 (Juillet-Août 2005) . - pp. 422-426 Mots-clés : Thymus  carnosus  Lamiaceae  Harvesting  period  Essential  oil  composition  Borneol  Terpinen-4-ol  Camphene  Cis-sabinene  hydrate Résumé : The essential oils, isolated by hydrodistillation, from the flowers and the remaining aerial parts (leaves plus stems) from three populations of Thymus carnosus Boiss., collected at different harvesting periods and in three collection sites of Portugal (QL, LM and LA) were analyzed by GC and GC/MS. The oil yields from the flowers collected in LA, QL and LM were six, four and one-fold higher, respectively, than the average oil yields from the remaining aerial parts. Monoterpenes were dominant in all oils (>86%), and sesquiterpenes accounted for 1–6% of the total oils. Diterpenes, phenylpropanoids and non-terpenoid compounds were present in all oils (0.1–0.6%, trace amounts and t-0.4%, respectively). Borneol (26–31%) and camphene (9–18%) dominated QL oils and borneol (18–23%), terpinen-4-ol (11–19%) and camphene (8–10%) were the main components of LM oils. LA oils showed high variability in the dominant components, cis-sabinene hydrate (14%), terpinen-4-ol (12%) and borneol (11%) being the main components in the flower oil. Terpinen-4-ol (18%) and borneol (18%) dominated the vegetative phase oil, whereas borneol (21%) and terpinen-4-ol (16%) dominated the aerial parts oils collected in May and July, respectively. QL oils can be classified as a borneol/camphene chemotype and one of the LA samples as borneol/cis-sabinene hydrate/terpinen-4-ol chemotype. However, all the other LM and LA samples do not fi t within the previously defi ned chemotypes. ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2005.9698950#.UchLnmF2_n6