基于全自动电位滴定仪的食品中过氧化值测定方法
目的 建立全自动电位滴定仪测定食品中过氧化值的方法。方法 针对不同种类食品提出相对应的前处理方法, 优化油脂提取条件, 建立不同种食品过氧化值仪器测定最佳参数。结果 提取溶剂为石油醚(30~60 ℃沸程), 添加量为石油醚: 样品量=3:1(V:V), 40 ℃减压旋蒸去溶剂。建立的自动电位滴定法测定食品中过氧化值结果平行性好, 日内精密度(RSD)1.62%~3.81%, 日间精密度(RSD)3.21%~6.89%。测定结果与人工目视碘量相比无显著性差异(P>0.05), 方法精密度高于碘量法。结论 全自动电位滴定方法适用于食品中过氧化值的测定, 结果准确度完全满足国标要求, 且操作简单, 精密度好, 适用性强。
Objective To establish a method for the determination of peroxide value in food products by autopotentiometric titrator. Methods Different pretreatment methods against various kinds of food products were proposed. The oil extract conditions and instrumental analysis parameters were optimized. Results Oil extraction solvent was confirmed to petroleum ether (30~60 ℃ boiling range), and the addition volume was petroleum ether: food sample=3:1 (V:V). Vacuum-rotary evaporation procedure at 40 ℃ was employed to remove the solvent. The established autopotentiometric titration method provided a good parallelism in peroxide value detection. The intra-day and inter-day accuracies of this method were 1.62~3.81% and 3.21~6.81%, respectively. No significant difference (P>0.05) was observed between autopotentiometric titration and visual iodometric method. Conclusion Autopotentiometric titration method is suitable for the determination of peroxide values in food products, and its accuracy is completely meet the national standard request. Moreover, this method is not only easy to operate but also have a good accuracy and applicability.
标题：基于全自动电位滴定仪的食品中过氧化值测定方法
英文标题：Determination of Peroxide Values of Food products with Autopotentiometric Titrator
作者：
柳鑫 武汉轻工大学食品科学与工程学院；武汉食品化妆品检验所
董砺节 武汉食品化妆品检验所
中文关键词:全自动电位滴定仪,油脂提取,过氧化值,
英文关键词:autopotentiometric titrator,oil extraction,peroxide value,
发表日期：2015-12-15
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