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Comparison of chemical composition of essential oil and n-hexane extracts of stachys Lavandulifolia vahl

Farshid Salimi, Malihe Khalilnejad, Ali Shafaghat, JafarAbbasi

The water distilled essential oil and n-hexane extract of Stachys lavandulifolia (family: Lamiaceae) growing inArdabil, north-west of Iran, were analyzed byGC and GC/MS. The yields were: 0.2%and 0.7%(V/W) for essential oil and n-hexane extract, respectively. Twenty-six compounds representing 72.0%of the distilled oil of S. lavandulifolia were identified, among them caryophyllene oxid (7.4%), á-pinene (7.0%), -Phellandrene (6.3%), germacrene-D(5.6%), spathulenol (5.0%), linalool (4.7%) and trans- â-farnesene (4.5%) were the major constituents. The extractwas characterized by higher amount of 9,12,15-octadecatrienoic methyl ester (34.0%), eicosane (10.7%), palmitic acid (9.9%) and nonacosane (7.5%).Twelve components, accounting for 82.7%of the total oil, were detected in the extract. The oil obtained by hydrodistillation method consists mainly of aliphatic oxygenated and sesquiterpene constituents, whereas the extract contains mainly aliphatic ester compounds.