自动电位滴定仪测定饼干中酸价和过氧化值的应用研究

Application of automatic potentiometric titrator in determination of acid value and peroxide value in biscuits

中文关键词:  饼干  酸价  过氧化值  电位滴定

英文关键词:biscuit  acid value  peroxide value  potentiometric titration

中文摘要:

      目的 建立自动电位滴定仪法测定饼干食品中酸价和过氧化值的检测方法。方法 通过石油醚超声浸提提取饼干样品中的油脂, 分别用自动电位滴定仪法和人工滴定法测定样品中的酸价和过氧化值。结果 取15份饼干样品分别用自动电位滴定仪和人工滴定测定酸价和过氧化值, 将结果进行配对t检验, 方法无显著差异(P＞0.05), 人工滴定法测定时高、低酸价值样品相对标准偏差分别为0.34%和6.74%, 自动电位滴定仪法测定时对应的相对标准偏差分别为0.27%和1.87%; 人工滴定法测定时高、低过氧化值样品相对标准偏差分别为0.13%和0.96%, 自动电位滴定仪法测定时对应的相对标准偏差分别为0.08%和0.21%。结论 自动电位滴定法测定饼干中酸价和过氧化值所得结果精密度均优于人工滴定法, 稳定性好, 安全且便于操作。

英文摘要:

      Objective To establish an automatic potentiometric titration method for the determination of acid value and peroxide value in biscuits. Methods The oil in the biscuit sample was extracted by ultrasonic extraction with petroleum ether, and the acid value and peroxide value in the sample were determined by automatic potentiometric titration and manual titration respectively. Results The acid value and peroxid value of 15 biscuit samples were determined by automatic potentiometric titration and manual titration, and the results were tested by paired t-test. There was no significant differences between the two methods (P＞0.05). The relative standard deviations of high and low acid value samples measured by manual titration were 0.34% and 6.74%, and 0.27% and 1.87% by automatic potentiometric titration respectively. The relative standard deviations of high and low peroxide value samples measured by manual titration were 0.13% and 0.96%, and 0.08% and 0.21% by automatic potentiometric titration respectively. Conclusion The precision of automatic potentiometric titration in the determination of acid value and peroxide value in biscuits is better than that of manual titration, with good stability, safety and easy operation.