【摘要】 以鲜榨菠萝汁为样品,建立了测定果汁总酸的自动电位滴定法。测定结果表明,鲜榨菠萝汁样品中的总酸含量为3.60g/L,变异系数为0.053%,回收率为99.7%～99.9%,该方法适用于果汁中总酸量的快速测定。对样品保存过程中酸度变化的研究表明,时间、温度、水分是影响酸度变化的主要因素。更多还原

【Abstract】 With fresh pineapple juice as a sample, the automatic potentionmetric titration was established to analyze the total acidity in the fruit juices. The result shows that the total acidity content was 3.6 g/L, and the variation coefficient was 0.053%. The recovery rate was 99.7%-99.9%. This method was suitable to analyze the total acidity in the fruit juices expeditiously. Meanwhile a series of results can be observed from the changing acidity during the storing procedure.Time, moisture and temperature were crucial factors to decide the final acidity of the sample.更多还原