3.2. Plant Material and Extraction

The aerial parts of Ruta graveolens L. (Rutaceae) were collected in summer 2016 in the Medicinal Plant Garden, Medical University of Lublin (Poland) and identified by Mrs. Krystyna Dąbrowska from the Botanical Garden of UMCS Lublin, Poland. A voucher specimen (200/16) is deposited in the Department of Pharmacognosy, Medical University of Lublin (Poland). The air-dried and grounded plant material (40 g) was subjected to ultrasound-assisted extraction for 30 min at room temperature with dichloromethane (3 × 160 mL). After combining all extracts and solvent removal, 1.15 g of crude extract (yield: 2.9%) resulted.