2.2. Extraction of the essential oil
Samples of 100 g of the air-dried aerial parts of plants were
subjected to hydrodistillation for 2 h using a Clevenger apparatus.
The obtained EO was dried over anhydrous sodium sulphate and,
after filtration, stored at þ4 C until tested. All experiments were
conducted in triplicates and results were expressed on the basis of dry matter weight.