应用激光拉曼光谱法检查核桃油的掺假  

Inspection of Adulteration of Walnut Oil by Laser Raman Spectrometry

作　　者：王红[1,2] 付晓华[2] 王利军 匡林鹤 张兰天 

机构地区：[1]河北省食品质量监督检验研究院,石家庄050091 [2]河北师范大学,石家庄050016

出　　处：《理化检验（化学分册）》2014年第1期23-26,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：河北省质量技术监督局科技计划重点项目(100103)

摘　　要：应用激光拉曼光谱法对掺入其它植物油(如大豆油、花生油、玉米油、棕榈油或棉籽油)的核桃油进行检测.从上述6种纯植物油的拉曼光谱图中取6个主峰的相对拉曼光谱强度为变量进行主成分分析,从所得的二维散点图可知核桃油与其它5种油均分处于图的不同区域;对掺杂不同比例(质量分数)其它油品的核桃油,在其散点图中也可见两者分处不同区域,据此可对掺杂其它油品的核桃油作出定性鉴别.利用波数为1 256 cm 1处拉曼光谱相对强度与掺杂油品的含量(w％)之间的线性关系及其所建立的线性回归方程,对掺杂的样品进行了定量分析.在纯核桃油中分别掺入质量分数从8％～95％的棕榈油制备了10份试样,按上述方法进行定量分析,结果表明预测值与已知值的相对误差在1.01％～2.35％之间.Laser Raman spectrometry was applied to the inspection of walnut oil blended with other vegetable oil (i.e.,soybean oil,peanut oil,corn oil,palm oil or cotton seed oil).Values of relative scattering intensity of six major peaks of Raman displacement (△v) were taken as variables from the Raman spectra of the 6 pure vegetable oil mentioned above and the method of principal componental analysis was applied.As shown in the 2D scatter diagrams,experimental points for the 6 oil were located in different areas in each of the diagrams,and for samples of walnut oil blended with different amounts (in w％) of any of the other 5 vegetable oil,experimental points for each of the 2 oil were found in different areas in the diagram.Based on these facts,qualitative discrimination was attained.Quantification of the adulterant oil was performed on the base of linear relationship between values of decrease of relative Raman scattering intensity at wave number of 1 256 cm-1 and the contents (in w％) of the adulterant oil and the linear regression equations derived.The quantitative method was certified by analyzing 10 samples of walnut oil adulterated with plam oil with mass fractions from 8％ to 95％,giving relative errors between the known values and the predicted values in the range of 1.01％-2.35 ％.

关 键 词：激光拉曼光谱法 核桃油的掺假 主成分分析法 定量分析 

分 类 号：O643.36[理学—物理化学] TS225.19[理学—化学]