Journal
JOURNAL OF ESSENTIAL OIL RESEARCH
Volume 20, Issue 3, Pages 255-259Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10412905.2008.9700005
Keywords
Silphium integrifolium; Silphium trifoliatum; Asteraceae; anatomical structure; essential oil composition; extract composition; modhephene; alpha-isocomene; allo-aromadendr-9-ene; beta-himachalene
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An anatomical evaluation of the secretory structures of Silphium integrifolium and S. trifoliatum rhizomes as well as GC-FID and GC/MS of the essential oil compositions and lipophilic extracts from organs of both species collected in 1999-2001. It was found that sesquiterpene compounds such as alpha-isocomene, modhephene, 7 beta-H-silphiperfol-5-ene, beta-caryophyllene, beta-isocomene, germacrene D, 7 alpha-H-silphiperfol-5-ene, silphiperfol-6-ene and beta-bisabolene were the main components of the tested oils and extracts from S. integrifolium and S. trifoliatum. Among the oils and extracts analyzed, significant amounts of allo-aromadendr-9-ene as well as alpha- and beta-himachalene were found only in S. integrifolium rhizome oil. The main constituent of lipophilic extracts that was absent in the oils was 16-acetoxycarterochaetol at average content of 39.7 +/- 1.0% and 40.5 +/- 5.9% in tested extracts.
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