Abstract:
: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 (69-9%). The sesquiterpene fraction was rather small (4-17%) and consisted mainly of oxygen-containing compounds (3-13%). Enantiomeric ratio of sabinene and alpha-terpineol was investigated in the oils from some populations. (+)-Sabinene was detected with high enatiomeric purity (96 99%). Although ( +)-alpha terpineol was the predominant enantiomer, its purity varied considerably (66-97%). Cluster analysis of all identified components grouped the oils into four main clusters that corresponded with their major components: alpha-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.
journal_name
Phytochemistryjournal_title
Phytochemistryauthors
Pereira SI,Santos PA,Barroso JG,Figueiredo AC,Pedro LG,Salgueiro LR,Deans SG,Scheffer JJdoi
10.1016/s0031-9422(00)00278-8subject
Has Abstractpub_date
2000-10-01 00:00:00pages
241-6issue
3eissn
0031-9422issn
1873-3700pii
S0031942200002788journal_volume
55pub_type
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