基于脂肪酸谱法分析山茶油掺伪

为了更好的检测市售山茶油中的掺混,本研究基于气相色谱-质谱联用技术(GC-MS)建立了一种检测山茶油中掺入其他低值植物油的方法。实验采用GC-MS检测了市售山茶油、芝麻油、花生油以及玉米油的脂肪酸组成,并对其脂肪酸成分进行比较,建立鉴别山茶油中掺混这几种植物油的方法以及掺假比例的预测与验证。结果表明,GC-MS检测出上述几种植物油的脂肪酸组成,其中主要的脂肪酸为棕榈酸、硬脂酸、油酸与亚油酸,其中山茶油的油酸含量高达78.8058%,实验检测山茶油中掺入低值油比例为10%、20%、30%、45%的掺假油,且根据特定的油酸的含量建立的回归方程的相关系数均大于0.98。因此根据该方法可以用于山茶油中掺入一种低值植物油的检测,最低检测掺入量为10%,且方法快速方便、且方法的准确率高于97%,较为灵敏。

Adulteration Analysis of Camellia Oil Based on Fatty Acid Spectrometry

In order to better detect the blending of commercially available camellia oil,this study established a method for the determination of other low-value vegetable oils in camellia oil based on gas chromatography-mass spectrometry(GC-MS). The fatty acid composition of commercially available camellia oil,sesame oil,peanut oil and corn oil was detected by GC-MS,and the fatty acid compositions were compared to establish a method for identifying the blending of these vegetable oils in camellia oil and the prediction and verification of adulteration ratio. The results showed that the fatty acid composition of the above several vegetable oils was detected by GC-MS. The main fatty acids were palmitic acid,stearic acid,oleic acid and linoleic acid. The oleic acid content of camellia oil was as high as 78.8058%. The experiment detected that the proportion of low-value oil in the camellia oil was 10%,20%,30%,45%,and the correlation coefficient established according to the specific oleic acid content was greater than 0.98.Therefore,according to the method,the method could be used for the detection of a low-value vegetable oil in the camellia oil,and the minimum detection incorporation amount was 10%,and the method was quick and convenient,and the accuracy of the method was higher than 97%,which was more sensitive.