选择离子流动管质谱法测定油脂中的呋喃

Determination of furan in some oils by selected ion flow tube-mass spectrometry

中文关键词:  呋喃  食用油  选择离子流动管质谱法

英文关键词:furan  edible oil  selected ion flow tube-mass spectrometry

中文摘要:

      目的 测定食用油等油中的呋喃含量。方法 将5 g油样密封于(540±5) mL瓶中, 加入一定量呋喃(X), 于65 ℃水浴加热1 h后测定其呋喃(Y)含量。选择离子流动管质谱(selected ion flow tube mass spectrometry, SIFT/MS)方法, 以NO+为初始离子, 测定油样密封瓶顶空中呋喃浓度, 再据呋喃标准曲线定量密封瓶中油样的呋喃含量。结果 所得标准曲线为: Y=29.55X+1.11(r2=0.9867, n=6), 其检测限和定量限分别为0.052 ng/g和0.063 ng/g。利用该标准曲线测定多种油, 其中废弃餐用油(即各种类型的地沟油、煎炸老油等)呋喃含量为4.37~17.83 ng/g; 大豆油、花生油、两种菜籽油、茶油、葵花油的呋喃含量均小于1 ng/g; 两种冷榨橄榄油的呋喃含量分别为1.19和4.39 ng/g。结论 该法可方便、快速、准确地测定油样中呋喃的含量, 呋喃可以作为鉴伪食用油和废弃餐用油的特征性指标。

英文摘要:

      Objective To determine the content of furan in some edible and non-edible oils. Methods The concentration of furan in the headspace of 5 g oils in sealed (540±5) mL bottles was determined by selected ion flue tube- mass spectrometry (SIFT/MS) with NO+ as pre-ion, based on the furan standard curve. Results The furan standard curve was Y=29.55X+1.11(r2=0.9867, n=6)with the limits of detection and quantitation were 0.052 ng/g and 0.063 ng/g, respectively. The furan content in the soybean oil, peanut oil, 2 kinds of rapeseed oil, camellia oil, sunflower oil were less than 1 ng/g. However, the furan in the non-edible oil such as original gutter oil, 2 kinds of refined gutter oils, 2 kinds of deep fried oils were 4.37~17.83 ng/g. The furan in 2 kinds of cold pressed olive oil were 1.19 and 4.39 ng/g. Conclusion Furan can be a charac-teristic indicator to judge the authentic oils, and SIFT/MS was proved to be a fast, easy and accurate method to determine furan content in edible or non-edible oils.