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Chemical Diversity of Volatiles of Teucrium orientale L. var. orientale , var. puberulens , and var. glabrescens Determined by Simultaneous GC‐FID and GC/MS Techniques
Author(s) -
Özek Gulmira,
Özek Temel,
Dinç Muhittin,
Doǧu Süleyman,
Başer Kemal H. C.
Publication year - 2012
Publication title -
chemistry and biodiversity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.427
H-Index - 70
eISSN - 1612-1880
pISSN - 1612-1872
DOI - 10.1002/cbdv.201100264
Subject(s) - teucrium , germacrene d , botany , essential oil , chemotaxonomy , chemistry , gas chromatography , chemical composition , gas chromatography–mass spectrometry , biology , chromatography , lamiaceae , taxonomy (biology) , mass spectrometry , organic chemistry
In the present work, three varieties of Teucrium orientale , var. orientale , var. puberulens , and var. glabrescens , were collected and investigated for chemical composition of the oils. Subsequent gas chromatography (GC‐FID) and gas chromatography coupled to mass spectrometry (GC/MS) revealed high abundance of sesquiterpenes in the essential oils analyzed. All the oils contained β ‐caryophyllene (22.6, 8.5, and 6.3%, resp.) and hexadecanoic acid (7.9, 12.8, and 13.1%). Germacrene D (24.6 and 33.4%) and bicyclogermacrene (6.7 and 8.5%) were found to be the main constituents of var. orientale and var. puberulens , respectively. The high percentages of β ‐cubebene (26.9%), α ‐cubebene (9.0%), and α ‐copaene (7.2%) established the diversity of var. glabrescens. The qualitative difference between the essential oils allowed the differentiation between the varieties in agreement with the morphological observations described in Flora of Turkey for each variety studied. In addition, a cluster analysis of twelve Teucrium taxa based on the essential‐oil composition has been carried out. Hovewer, the analysis did not clearly reflect the infrageneric classification of the genus, it largely confirmed the relationships between the infraspecific taxa of Teucrium orientale and T. chamaedrys.