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目的建立应用UDK159自动蒸馏滴定系统测定海虾及海虾制品中挥发性盐基氮含量的方法。方法样品经过前处理后,采用UDK159自动蒸馏滴定系统进行全自动蒸馏滴定测定,根据酸的消耗量求出挥发性盐基氮的含量。结果分别对三个浓度进行12次测定,变异系数分别为2.57%、1.37%和1.43%,回收率为97.6%~101%,与传统的半微量法测定结果进行比较,差异无统计学意义(P均>0.05)。结论用UDK159自动蒸馏滴定系统测定海虾及海虾制品中的挥发性盐基氮含量的操作简便快捷,适合大批量样品的测定。
Objective To establish a method for the determination of volatile basic nitrogen in shrimp and shrimp products using UDK159 automatic distillation titration system. Methods After the sample was pretreated, the UDK159 automatic distillation titration system was used for the automatic distillation titration. The content of volatile basic nitrogen was calculated according to the acid consumption. Results The determination of three concentrations were carried out 12 times, the coefficient of variation were 2.57%, 1.37% and 1.43%, the recovery rate was 97.6% ~ 101%, compared with the traditional semi-micro method, the difference was not statistically significant P> 0.05). Conclusion The UDK159 automatic distillation titration system is simple, quick and easy to determine the volatile basic nitrogen of shrimp and shrimp products, suitable for the determination of large quantities of samples.