[article] 
inThe journal of essential oil research > Vol. 22 N° 4 (Juillet/Août 2010) . - pp. 310-313

Titre :	Analysis of cymenes in essential oils : The case of lepechinia meyeni (Walp.) Epling.
Type de document :	texte imprimé
Auteurs :	Guy Collin, Auteur ; François-Xavier Garneau, Auteur ; Hélène Gagnon, Auteur
Année de publication :	2011
Article en page(s) :	pp. 310-313
Note générale :	Génie Chimique
Langues :	Anglais (eng)
Mots-clés :	Lepechinia meyeni Lamiaceae Essential oil composition o-cymene m-cymene p-cymene 3,7,7-trimethyl-1,3,5-cycloheptatriene
Index. décimale :	646
Résumé :	The similarity of the mass spectra of the o-, m- and p-cymenes together with the small differences of their retention indices make it difficult to unambiguously identify the three cymene isomers. Moreover, there are discrepancies in the various data banks used as a reference in the analysis of essential oils. The authors have taken advantage of the presence of these three compounds in the oil of Lepechinia meyeni to identify the right order of elution of these compounds on both non-polar and polar columns. The order of elution on both DB-5 and S-wax 10 capillary columns is: m-, followed closely by p- and finally at some distance, o-cymene. A fourth compound having a similar mass spectrum was observed. From the literature, it was tentatively identified as 3,7,7-trimethyl-1,3,5-cycloheptatriene.
DEWEY :	665
ISSN :	1041-2905
En ligne :	http://www.tandfonline.com/doi/abs/10.1080/10412905.2010.9700333

[article] Analysis of cymenes in essential oils : The case of lepechinia meyeni (Walp.) Epling. [texte imprimé] / Guy Collin, Auteur ; François-Xavier Garneau, Auteur ; Hélène Gagnon, Auteur . - 2011 . - pp. 310-313.
Génie Chimique
Langues : Anglais (eng)
in The journal of essential oil research > Vol. 22 N° 4 (Juillet/Août 2010) . - pp. 310-313

Mots-clés :	Lepechinia meyeni Lamiaceae Essential oil composition o-cymene m-cymene p-cymene 3,7,7-trimethyl-1,3,5-cycloheptatriene
Index. décimale :	646
Résumé :	The similarity of the mass spectra of the o-, m- and p-cymenes together with the small differences of their retention indices make it difficult to unambiguously identify the three cymene isomers. Moreover, there are discrepancies in the various data banks used as a reference in the analysis of essential oils. The authors have taken advantage of the presence of these three compounds in the oil of Lepechinia meyeni to identify the right order of elution of these compounds on both non-polar and polar columns. The order of elution on both DB-5 and S-wax 10 capillary columns is: m-, followed closely by p- and finally at some distance, o-cymene. A fourth compound having a similar mass spectrum was observed. From the literature, it was tentatively identified as 3,7,7-trimethyl-1,3,5-cycloheptatriene.
DEWEY :	665
ISSN :	1041-2905
En ligne :	http://www.tandfonline.com/doi/abs/10.1080/10412905.2010.9700333