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Chemical polymorphism of the essential oils from populations of Thymus caespititius grown on the island S. Jorge (Azores) by S.I Pereira; P.A.G Santos; J.G Barroso; A.C Figueiredo; L.G Pedro; L.R Salgueiro; S.G Deans; J.J.C Scheffer is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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The compositions of the essential oils obtained from ten populations of Thymus caespititius grown on S. Jorge (Azores) were studied by GC and GC±MS. All the oils analysed were dominated by their monoterpene fraction (69±91%). The sesquiterpene fraction was rather small (4±17%) and consisted mainly of oxygen-containing compounds (3±13%). Enantiomeric ratio of sabinene and a-terpineol was investigated in the oils from some populations. (+)-Sabinene was detected with high enatiomeric purity (96± 99%). Although (+)-a terpineol was the predominant enantiomer, its purity varied considerably (66±97%). Cluster analysis of all identi®ed components grouped the oils into four main clusters that corresponded with their major components: a-terpineol (43± 68%), carvacrol (32±52%), thymol (44±58%) and sabinene (41%). The essential oil from Th. caespititius showed a clear chemical polymorphism, that was particularly evident among four populations growing along a 200 m distance at Pico Verde.

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Author

S.I Pereira; P.A.G Santos; J.G Barroso; A.C Figueiredo; L.G Pedro; L.R Salgueiro; S.G Deans; J.J.C Scheffer

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0031-9422)

Published

2000

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)