Chemical Composition of the Essential Oils Obtained from the Leaves, Fruits and Stems of Salvia verbenaca L. from the Northeast Region of Tunisia

The variation in essential oil composition of Salvia verbenaca L. fruits, stems and leaves was determined by GC and GC/MS. Essential oil yields were 0.003%, 0.01% and 0.06% in the leaves, stems and fruits, respectively (dwt). Sixty-three components were identified in the fruit oil with beta-caryophyllene (23.1%), caryophyllene oxide (15.9%), camphene (6.5%), alpha-humulene (5.6%) and viridiflorol (4.3%) as the most abundant components and sesquiterpenes hydrocarbons were the predominant class (35.1%). Forty-four constituents were detected in the stem oil which was rich in oxygenated monoterpenes (26.5%). Camphor (10.9%) and viridiflorol (10.3%) were found as the main constituents. In contrast to the other oils, the leaf oil was characterized by the occurrence of labdane type diterpenes (24.7%) in high amounts with epi-13-manool (13.7%) and manool (11.0%) as main compounds.