基于紫外光谱的花生油掺伪检测

Ultraviolet Absorption Spectroscopy for the Detection of Adulteration in Peanut Oil

为建立一种花生油掺伪检测方法,利用花生油和其他食用油在紫外光谱特征吸收峰不同,建立定量检测模型及并对模型进行验证分析。结果表明:花生油与其他食用油在280nm处特性吸收存在差异性,利用这一特性建立花生油掺伪定量分析模型,其方程为y=46.72x-27.51(y为掺伪比例/%;x为吸光度),相关系数为0.9779,标准差为3.099%。盲样验证预测值与实际掺伪值高度线性相关,相关系数为0.9841,标准差为3.849%,检出限约为10%,相对误差均小于15%。紫外光谱花生油掺伪快速检测方法是可行的。

An ultraviolet absorption spectroscopic method for detecting adulteration in peanut oil was developed.Based on differences in the ultraviolet characteristic adsorption peaks between peanut oil and other edible oils,a quantitative detection model was established as follows：y=46.72x-27.51 [y=adulteration ratio（%,m/m）;x=absorbance].The correlation coefficient of the model was 0.9779 and the standard deviation 3.099%.A highly linear correlation was observed between the predicted and actual adulteration ratios of an unknown sample with a correlation coefficient of 0.9841 and a standard deviation of 3.849%.The detection limit was approximately 10% and the relative error was less than 15%.The ultraviolet absorption spectroscopic method is applicable for the rapid detection of adulteration in peanut oil.