食用油品种及含量与油脂折射率关系的探究

Analysis of edible oil species using the grease refractive index

以常见的四种食用油花生油、大豆油、葵花油和菜籽油为研究对象,采用阿贝折射仪测定不同品种、不同成分和含量的混合油脂的折射率,找出折射率变化的规律,为进行食用油分析提供技术支持。在20℃条件下对花生油、大豆油、菜籽油和葵花油的折射率进行测定,结果分别为1.47161、1.47510、1.47287、1.47514;然后进行两两混合、三三混合,得到混合油中不同油脂含量的变化对其折射率影响的关系。花生大豆、花生菜籽和花生葵花混合油脂的折射率随着花生油含量的变化方程式分别为:y=-0.00034x+1.475、y=-0.00017x+1.4733、y=-0.00034x+1.4751;大豆菜籽混合油的折射率随菜籽油含量的变化方程式为:y=-0.00021x+1.475。三种混合油中不同成分的含量变化对食用油折射率的影响为简单的一次函数关系:Y=1.472679143-0.0008354285714X1+0.0025622857143X2(X1代表花生油含量,X2代表大豆油含量)。

The common four kinds of edible oil：peanut oil,soybean oil,sunflower oil and canola were used as the research materials.Using Abbe refractometer to measure the refractive index of different varieties,composition and content of mixed greases,the changing rule of refractive index could provide technological support for the analysis of cooking oil.The refractive index in 20℃ of the peanut oil,soybean oil and rapeseed oil and sunflower oil were 1.47161,1.47510,1.47287,1.47514.Then the two and three kinds of samples of the four kind cooking oils were mixed by changing the content of two or three kinds of greases.By measuring the refractive index of those samples,plenty of data to analyse the influence of refractive index to different greases was obtained,and the relationship between the refractive index and the change of content was summarized and showed that which was a simple linear function relation.The refractive index equation as peanut oil content variation of peanut and soybean oil mixture,peanut and rapeseed oil mixture,peanut and sunflower oil mixture were y=-0.00034x＋1.475,y=-0.00017x＋1.4733,y=-0.00034x＋1.4751 respectively.The refractive index equation as rapeseed oil content variation of soybean and rapeseed oil mixture was y=-0.00021x＋1.475.The refractive index change of peanut,soybean and rapeseed mixed oil was a simple one function relation：Y=1.472679143-0.0008354285714X 1＋0.0025622857143X2（X1 represented the content of peanut oil,X2 represented the content of soybean oil）.