月饼中酸价测定方法的改进

Improvement of determination method of acid price in moon cakes

中文关键词:  月饼  浓缩  酸价

英文关键词:moon cake  concentration  acid value

中文摘要:

      目的 建立正己烷超声提取法快速提取月饼中的油脂并检测其酸价。方法 采用控制单一变量法, 利用超声波和正己烷提取月饼中的油脂, 再用加热吹氮技术去除有机溶剂, 用指示剂滴定法测定计算月饼的酸值。结果 油脂的最佳提取条件为: 样品称取量为10 g, 正己烷为20 mL, 提取时间为25 min, 回收率为96%, 满足实验要求。提取时间同国标方法中的常温静置浸提法和索氏提取法对比分别缩短了96%和89%。结论 该方法操作简单, 实验时间短, 精密度准确度可靠, 适用于月饼中酸价的测定。

英文摘要:

      Objective To establish a method for extraction of the oil in moon cake by aultrasonic extraction of n-hexane and detect its acid value. Methods The single variable method was used to extract the oil in the moon cake by ultrasonic wave and n-hexane, then the organic solvent was removed by heating nitrogen blowing technique, and the acid value of the moon cake was determined by the indicator titration method. Results The optimal extraction conditions for the oil and fat were as follows: the sample was weighed 10 g, the n-hexane was 20 mL, and the extraction time was 25 min. The recovery rate was 96%, meeting the experimental requirements. The extraction time was 96% and 89% shorter than that of the normal temperature static extraction method and Soxhlet extraction method of the national standard method, respectively. Conclusion The method is simple in operation, short in experimental time, reliable in precision and suitable for determination of acid value in moon cakes.