Study on antioxidant capacities and antibacterial effects of eighteen blueberry cultivars from different areas

The antioxidant capacities and antibacterial effects of 18 different blueberry cultivars from Hangzhou,Shanghai and Qingdao were investigated in this study. The antioxidant capacities of blueberry extracts were measured through free radical scavenging abilities including DPPH· and OH· free radicals and reducing power.The contents of total phenolics,flavonoids and anthocyanins were determined using Folin- Ciocalteu method,Sodium nitrite method and p H differential method respectively. The antibacterial effects of blueberry extracts against Vibrio parahaemolyticus were determined by the test tube two- fold dilution method.The results showed that18 blueberry cultivars from three different areas showed good DPPH· and OH· free radical scavenging abilities with the range from 11% ~65% and 20% ~64%,respectively.The blueberry cultivars of Hangzhou showed stronger reducing power than those of the other two areas. 18 blueberry cultivars showed different antibacterial effects against Vibrio parahaemolyticus with the Minimal inhibitory concentration( MIC) and the Maximum inhibitory concentration( MBC) being of 15.625 mg / m L and 250 mg / m L,respectively. It can be concluded that there were differences in their function and components among different blueberry cultivars of different areas.