The determination of contents and components of vitamin E in 138 edible vegetable oil samples from 9 varieties was conducted in order to analyze and study the distribution of components and contents of vitamin E in different edible vegetable oils.The results showed that the contents ranges of vitamin E in 101 first-grade vegetable oils of 9 varieties were 5.9-1 246.6 mg/kg,with the average value of 652.4 mg/kg.The average content of vitamin E in soybean oil was the highest,followed by cottonseed oil,corn oil,sunflower seed oil,rapeseed oil,rice bran oil,peanut oil,sesame oil and oil-tea camellia seed oil.Additionally,a significant difference in the components of vitamin E occurred in different oil samples.Rice bran oil contained eight kinds of vitamin E and the average content of tocotrienols accounted for 44.2％ of the average content of vitamin E.Corn oil contained three types of tocopherols and two types of tocotrienols.Cottonseed oil contained three types of tocopherols and one type of tocotrienol.However,the average content of tocotrienol in these two varieties of vegetable oils accounted for 5.8％ and 2.8％ of the average content of vitamin E,respectively.Soybean oil,rapeseed oil,sunflower seed oil and peanut oil contained α-,γ-and δ-tocopherol.Oil-tea camellia seed oil contained α-and γ-tocopherol and sesame oil only contained y-tocopherol.All of these varieties of vegetable oils contained α-and γ-tocopherol except sesame oil.Meanwhile,sunflower seed oil had the highest content of α-tocopherol and soybean oil had the highest content of γ-tocopherol.The contents of vitamin E in the same variety of vegetable oil of different grades appeared differences.The content of vitamin E decreased with the refining degree of vegetable oil.However,the contents of vitamin E in some second-grade rapeseed oil samples were lower than those in first-grade rapeseed oil.This phenomenon was related to the source of the collected oil samples.The vitamin E content in different varieties and different grades of edible vegetable oils showed obvious differences due to the different kinds of oilseeds and the different refining processes of oils.%通过对9个不同品种的138个食用植物油样品中维生素E组分及含量的测定,分析研究不同食用植物油中维生素E组分及含量的分布情况.结果表明:9个油脂品种、101个一级油样品中维生素E含量范围为5.9～1 246.6 mg/kg,平均值652.4 mg/kg,维生素E总量的平均值排序为大豆油＞棉籽油＞玉米油＞葵花籽油＞菜籽油＞米糠油＞花生油＞芝麻油＞山茶油;不同油脂样品中维生素E的组分有明显差别,米糠油含有最齐全的8种维生素E组分,并且生育三烯酚含量的平均值占维生素E总量平均值的44.2％;玉米油含有3种生育酚和2种生育三烯酚,棉籽油中含有3种生育酚和1种生育三烯酚,但这两种油脂中生育三烯酚含量平均值分别仅占维生素E总量平均值的5.8％和2.8％;大豆油、菜籽油、花生油、葵花籽油均含有α-、γ-、δ-生育酚3种组分;山茶油中含有α-、γ-生育酚2种组分;芝麻油仅含有γ-生育酚1种组分.除芝麻油之外,所有油脂中均含有α-生育酚和γ-生育酚,其中葵花籽油中α-生育酚含量最高,大豆油中γ-生育酚含量最高.同一油脂品种、不同等级的油脂中维生素E含量也存在差异,总体趋势是维生素E含量随油脂精炼程度的加深而降低,但个别二级菜籽油样品中维生素E含量低于一级菜籽油,这与所采集油脂样品的来源不同有关.不同油脂品种、不同等级的食用植物油中维生素E组分及含量因油料品种、油脂精炼工艺的不同显示出明显差异.
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