*2.8. Preparation of Ethanol Extracts*

The collected leaves were vacuum-dried at 40 ◦C. The dried samples were ground into a powder using a small crusher (HX-200 A, Xian Hardware and Pharmacy Co., Ltd., Xian, China). For each treatment, 1 g of powdered leaves was extracted ultrasonically for 30 min with a 10 mL ethanol solution (80%). The mixtures were centrifuged for 3 min at 4 ◦C at 4000× *g* [58]. The supernatant was collected and stored at 4 ◦C for 48 h.
