三种食醋中酚类物质及抗氧化能力的比较研究
Analysis and comparison of polyphenols composition and antioxidant capacity in three kinds of vinegar
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摘要: 通过光谱和高效液相色谱技术对苹果醋、山西老陈醋及恒顺香醋中酚类物质以及抗氧化能力进行分析研究,评价三种醋的营养价值。结果表明:三种醋都具有较高的总酚,且粮食醋大于苹果醋。同时总酚与抗氧化能力呈显著正相关。在色谱条件下,以没食子酸等十六种单体酚作为标准品,苹果醋中能被定量的单体酚有8种,其中绿原酸(6.56mg/L)、咖啡酸(3.03mg/L)和根皮苷(1.76mg/L)含量最为丰富,是苹果醋相对粮食醋的特征单体酚;粮食醋(山西老陈醋和镇江香醋)中能被定量的单体酚有5种,其中没食子酸含量最高(在山西老陈醋中含量为60.56mg/L,恒顺香醋中为241.96mg/L),山西老陈醋和恒顺香醋中多酚物质结构比例差距较大。Abstract: The spectrophotometric and HPLC was used to determine the polyphenols composition and antioxidant activities in apple cider vinegar and food vinegar (shanxi aged vinegar and hengshun vinegar) . The results showed that three kinds of vinegar contains high amounts of the total phenols, and food vinegar possesses higher values than apple cider vinegar. Meanwhile, a significant positive correlation between phenolics and antioxidant capacity was observed. In the monomeric phenolics detected, the apple cider vinegar not only had eight kinds of free phenols, but also had some unique polyphenols such as chlorogenic acid (6.56mg/L) , caffeic acid (3.03mg/L) and phloridzin (1.76mg/L) which had been found seldom in food vinegar in the chromatographic conditions of the experiment when sixteen standard as a reference. Concerning food vinegar, five kinds of free phenols were quantified, and the highest concentration of monomeric phenols was gallic acid. The hengshun vinegar displayed the highest gallic acid values (241.96mg/L) followed by shanxi aged vinegar (60.56mg/L) .There was a big difference in the polyphenols ratio between shanxi aged vinegar and hengshun vinegar.