摘要
建立了傅里叶变换衰减全反射红外光谱法(ATR-FTIR)结合向前区间偏最小二乘法(FiPLS)快速测定食用油中总极性化合物的分析方法。以精炼大豆油、花生油、菜籽油、葵花籽油及其煎炸油为研究对象,通过光谱预处理,采用FiPLS优化建模区间,得到了较优的总极性化合物分析通用模型。结果表明:原始红外波谱经二阶导数处理后,在3 400~2 800、1 800~1 400、1 000~800 cm~(-1)上建模,所得模型的性能最优,此时模型的决定系数为0.999 0,校正均方差为0.93,预测均方差为1.16。利用5种类型的油共15个样品对模型进行准确性验证。结果显示,其真实值与红外预测值的相对误差仅为3.88%,表明所开发的红外模型具有良好的准确度、稳定性和广谱性。
引文
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