Thymus munbyanus subsp. coloratus (Boiss. & Reut.) Greuter & Burdet (Lamiaceae) is a small shrub endemic to Algeria and Morocco where it’s found in lawns, rockeries and mountainous regions. From a phytochemical point of view this taxon has never been characterized. In this work we have analyzed the chemical compositions of the essential oils obtained from inflorescences and vegetative parts of Thymus munbyanus subsp. coloratus from Algeria by GC/MS. A total of 109 volatile components were identified in the two samples (103 in stems and leaves, 102 in inflorescences) accounting for 98.4 – 98.7% of the total compositions. Overall, they showed similar chemical profiles. The two essential oils were dominated by oxygenated monoterpenes (68.2% in flowers and 59.4% in vegetative parts), followed by monoterpene hydrocarbons (12.1% and 24.4%, respectively), sesquiterpene hydrocarbons (11.0% and 8.5%, respectively) and oxygenated sesquiterpenes (6.7% and 4.9%, respectively). The major oil constituent was borneol accounting for 44.8% and 31.2% of flowers and aerial parts essential oils, respectively. A new chemotype, i.e. borneol-chemotype, was characterized for the first time in the species.
Chemotypification of Thymus munbyanus subsp. coloratus (Boiss. & Reut.) Greuter & Burdet (Lamiaceae) essential-oil
F. Maggi
2018-01-01
Abstract
Thymus munbyanus subsp. coloratus (Boiss. & Reut.) Greuter & Burdet (Lamiaceae) is a small shrub endemic to Algeria and Morocco where it’s found in lawns, rockeries and mountainous regions. From a phytochemical point of view this taxon has never been characterized. In this work we have analyzed the chemical compositions of the essential oils obtained from inflorescences and vegetative parts of Thymus munbyanus subsp. coloratus from Algeria by GC/MS. A total of 109 volatile components were identified in the two samples (103 in stems and leaves, 102 in inflorescences) accounting for 98.4 – 98.7% of the total compositions. Overall, they showed similar chemical profiles. The two essential oils were dominated by oxygenated monoterpenes (68.2% in flowers and 59.4% in vegetative parts), followed by monoterpene hydrocarbons (12.1% and 24.4%, respectively), sesquiterpene hydrocarbons (11.0% and 8.5%, respectively) and oxygenated sesquiterpenes (6.7% and 4.9%, respectively). The major oil constituent was borneol accounting for 44.8% and 31.2% of flowers and aerial parts essential oils, respectively. A new chemotype, i.e. borneol-chemotype, was characterized for the first time in the species.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
