Artemisia magellanica. Chemical Composition of the Essential Oil from an unexplored endemic species of Patagonia

GASTALDI, BRUNO; GONZÁLEZ, SILVIA B.; DI LEO LIRA, PAOLA; CATALÁN, CÉSAR

Chemistry and Biodiversity

Wiley VHCA AG

Lugar: Zurich; Año: 2019

1612-1872

The essential oil composition of the aerial parts of Artemisia magellanica SCH. BIP. (Asteraceae), native toPatagonia, was analyzed by GC-FID-MS. This is the first report on the essential oil composition of A. magellanica.A total of 113 components were identified accounting for 95.6?95.7% of the oil. The essential oil wascharacterized by a high percentage of γ-costol (21.0?43.5 %), selina-4,11-diene, (Z)-β-ocimene, (E)-β-farnesene,(Z)-en-yn-dicycloether and 23 different esters (28.7 %). In turn, Artemisia biennis, a species native to NorthAmerica, which is considered by some authors to be conspecific with A. magellanica, yielded an essential oil thatwas rich in (Z)-β-ocimene (34.7 %), (E)-β-farnesene (40.0%) and the acetylenes (Z)- and (E)-en-yn-dicycloethers(11.0 %). Thus, as A. biennis lacks the three main components present in A. magellanica, namely γ-costol, 2-methylbutyl 2-methylbutyrate and selina-4,11-diene, these compounds could be considered as potentialchemical markers for A. magellanica since they are absent or only found as minor constituents in other membersof the genus. The data presented herein is also useful for genus taxonomy.