自动电位滴定法测定果汁的总酸及果汁酸度的变化规律  

ANALYSIS OF TOTAL ACIDITY IN FRUIT JUICES BY AUTOMATIC POTENTIONMETRIC TITRATION AND THE CHANGE RULES OF THE ACIDITY

作　　者：罗盛旭[1] 吴良[1] 梁振益[1] 牛成[2] 杨雪蕊[2] 

机构地区：[1]海南大学理工学院,海南省精细化工重点实验室,海口570228 [2]海南大学公共实验中心,海口570228

出　　处：《化学分析计量》2007年第5期53-56,共4页Chemical Analysis And Meterage

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。　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.

关 键 词：自动电位滴定法 菠萝汁 总酸 酸度变化 

分 类 号：TS262.3[轻工技术与工程—发酵工程]