Anthocyanins extraction from Sanhua plums by ultrasonic-assisted and study on its antioxidant ability

Extraction technology and antioxidant ability of anthocyanins from no crushing Sanhua plums were investigated. Firstly, mature plums as the raw materials were cut into certain thickness of sheet about 2 cm. Then using single factor and orthogonal method, the optimum extraction conditions were as following: p H 2, ethanol solution(70%) as solvent, 1∶12(W/V) of material-to-liquid ratio for 50 min with ultrasonic power 400 W at 55℃. Under these conditions, the concentration of anthocyanins was up to the maximum, 21.98 μg/L. The organization of Sanhua plums after extraction was complete and could be used as material of preserved fruit. After purified by AB-8 macro porous resins and freeze-dried,the crude extract of anthocyanidins was obtained. The crude extract of anthocyanidins had good scavenging activity on hydroxyl radical and superoxide anion with scavenging ratio 51.21% of 2.4 mg/m L, and 48.70% of 0.4 mg/m L, respectively.