Chemical analysis and antimicrobial activity of essential oils from the aromatic plants artemisia afra jacq. and leonotis ocymifolia (Burm. F.) iwarsson var. raineriana (Vision1) iwarsson growing In Tanzania / K. Vagionas in The journal of essential oil research, Vol. 19 N°4 (Juillet/Août 2007)  

Public ISBD [article]  inThe journal of essential oil research > Vol. 19 N°4 (Juillet/Août 2007) . - pp. 396-400 Titre : Chemical analysis and antimicrobial activity of essential oils from the aromatic plants artemisia afra jacq. and leonotis ocymifolia (Burm. F.) iwarsson var. raineriana (Vision1) iwarsson growing In Tanzania Type de document : texte imprimé Auteurs : K. Vagionas, Auteur ; K. Graikou, Auteur ; I. B. Chinou, Auteur Année de publication : 2007 Article en page(s) : pp. 396-400 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Artemisia afra Asteraceae Leonotis ocymifolia var. raineriana Lamiaceae Essential oil composition α  -thujone Camphor Germacrene D Antimicrobial activity Résumé : Hydrodistilled volatile oils from the aerial parts of Artemisia afra and leaves of Leonotis ocymifolia var. raineriana were investigated, by a combination of GC and GC/MS. From A. afra 37 compounds were identified, representing 95.3% (area percent) of the total oil and from L. ocymifolia var. raineriana, 27 compounds were identified, representing 91.1% of the total oil. Among the identified components camphor (46.2%), α-thujone (15.2%), artemisia ketone (7.4%) and 1,8-cineole (4.2%) were found as the main components of A. afra oil and germacrene D (36.8%), (Z)-β-ocimene (7.9%), β-caryophyllene (7.0%) and (E)-β-ocimene (4.4%) were the major components of L. ocymifolia oil. Furthermore, the oils, as well as nine of their constituents, were evaluated for their antimicrobial activity, against six bacteria, two oral pathogens and three pathogenic fungi. The results showed that the oil of A. afra has a moderate antimicrobial activity, while the oil of L. ocymifolia exhibited a stronger one against Gram-negative bacteria and oral pathogens, and a weaker one against Gram-positive bacteria. This interesting profle can be attributed to the high content of the oil, of germacrene D which is known for its antimicrobial activity. ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2007.9699314#.UW5f30qC5mM [article] Chemical analysis and antimicrobial activity of essential oils from the aromatic plants artemisia afra jacq. and leonotis ocymifolia (Burm. F.) iwarsson var. raineriana (Vision1) iwarsson growing In Tanzania [texte imprimé] / K. Vagionas, Auteur ; K. Graikou, Auteur ; I. B. Chinou, Auteur . - 2007 . - pp. 396-400. Génie Chimique Langues : Anglais (eng) in The journal of essential oil research > Vol. 19 N°4 (Juillet/Août 2007) . - pp. 396-400 Mots-clés : Artemisia afra Asteraceae Leonotis ocymifolia var. raineriana Lamiaceae Essential oil composition α  -thujone Camphor Germacrene D Antimicrobial activity Résumé : Hydrodistilled volatile oils from the aerial parts of Artemisia afra and leaves of Leonotis ocymifolia var. raineriana were investigated, by a combination of GC and GC/MS. From A. afra 37 compounds were identified, representing 95.3% (area percent) of the total oil and from L. ocymifolia var. raineriana, 27 compounds were identified, representing 91.1% of the total oil. Among the identified components camphor (46.2%), α-thujone (15.2%), artemisia ketone (7.4%) and 1,8-cineole (4.2%) were found as the main components of A. afra oil and germacrene D (36.8%), (Z)-β-ocimene (7.9%), β-caryophyllene (7.0%) and (E)-β-ocimene (4.4%) were the major components of L. ocymifolia oil. Furthermore, the oils, as well as nine of their constituents, were evaluated for their antimicrobial activity, against six bacteria, two oral pathogens and three pathogenic fungi. The results showed that the oil of A. afra has a moderate antimicrobial activity, while the oil of L. ocymifolia exhibited a stronger one against Gram-negative bacteria and oral pathogens, and a weaker one against Gram-positive bacteria. This interesting profle can be attributed to the high content of the oil, of germacrene D which is known for its antimicrobial activity. ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2007.9699314#.UW5f30qC5mM

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