Journal
CHEMISTRY & BIODIVERSITY
Volume 9, Issue 4, Pages 806-816Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cbdv.201100214
Keywords
Hypericum triquetrifolium; Essential oils; Monoterpenes; Sesquiterpenes; Principal-component analysis (PCA)
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The chemical composition of the essential oils of five populations of Hypericum triquetrifolium Turra from Tunisia and their intraspecific variability were analyzed in detail by GC/MS. One hundred seventy-four compounds were identified, representing averages of 87.9 to 98.7% of the oil composition. The components are represented here by homologous series of monoterpene hydrocarbons, oxygenated monoterpenes, sesquiterpenes hydrocarbons, oxygenated sesquiterpenes, non-terpenic hydrocarbons, and others. Sesquiterpene hydrocarbons were the most abundant chemical compounds. Multivariate chemometric techniques, such as cluster analysis (CA) and principal-component analysis (PCA), were used to characterize the samples according to the geographical origin. By statistical analysis, the analyzed populations were classified into four chemotype groups.
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