中文摘要：

研究了不同萃取溶剂及pH值对蓝莓中可萃取多酚（EPP）和不可萃取多酚（NEPP）萃取率的影响,并用DPPH法研究了这两类多酚的抗氧化活性.结果表明,加入甲醇、乙醇、丙酮等有机溶剂可明显提高EPP的萃取率,其中以50%乙醇的萃取率最高.采用硫酸水解法分离制备NEPP,结果表明,蓝莓的NEPP含量远远高于EPP.EPP的抗氧化活性与其含量呈正相关性.萃取溶液pH值对EPP萃取率具有明显的影响,pH值越低,可萃取率越高.

英文摘要：

The effect of solvent and pH on the contents of extractable polyphenols （EPP） and non-ex- tractable polyphenols （NEPP） of blueberries was investigated in this paper. The antioxidant activity of polyphenols was also determined by DPPH system. The results showed that the solvent containing metha- nol, ethanol and acetone can enhance the EPP contents, especially 500/0 ethanol. The NEPP contents i- solated by the hydrolysis of sulfuric acid were much higher than that of EPP. There is a good correlation between the antioxidant activity and the EPP content. The yield of EPP increased with the decreasing of pH.