2. MATERIALS AND METHODS
Preparation of extracts
The black mulberry (Morus nigra) fruits were collected at their optimum commercial maturity in Uzumlü Town, Erzincan, Turkey. The fresh fruit samples were packed on ice while being transported to the laboratory. Fruits samples were frozen at –20oC until extraction. The leaves of black mulberry were dried in shade and powdered with a blender. The fruits and powdered leaves (20mg) were extracted with methanol in a Soxhlet apparatus for 24 h. Then methanol was evaporated with rotary evaporator. Water extracts were also prepared by adding boiling water (200ml) to 20 g of powdered material in a glass flask and incubated at room temperature for 2 hours on a rotating shaker (200 rpm). Mixture was filtered using Whatman (No.1) filter paper and then filtrate was lyophilized. All extracts were stored in freezer at –24oC until use.