摘要
Abstract
In order to study on stability of tocopherols (T) and tocotrienols (T3) in oil under the condition of high temperature and accelerated oxidation,the blended oil which is rich in 8 tocopherols and tocotrienols was made by palm oil,soybean oil and wheat germ oil,thermal stability of tocopherols and tocotrienols at 100 ℃,150 ℃,200 ℃ and accelerated oxidative stability at 25 ℃,100 ℃,110 ℃,120 ℃ were analyzed.The results showed that the loss of tocopherols and tocotrienols increased with rising temperature and increasing time,the order of tocopherols and tocotrienols loss in blended oil was δ-T ＜ β-T ＜ α-T ＜ γ-T ＜ δ-T3 ＜ β-T3 ＜ α-T3 ＜ γ-T3,when the temperature was above 150 ℃,the total loss rate of tocopherols and tocotdenols was 29.81％,24.17％,31.58％,21.19％ at 100 ℃ for 96 h,150 ℃ for 24 h,180 ℃ for 16 h,200 ℃ for 8 h,respectively.The loss order turned into δ-T ＜ δ-T3 ＜ ~T ＜ β-T ＜ γr-T3 ＜ β-T3 ＜ α-T ＜ α-T3 when the temperature was below 120 ℃,the total loss rate was almost 0％ at 25 ℃ for 6 h,and increased to 45.25％,97.32％ at 100 ℃,110 ℃,respectively.So the tocopherols and tocotdenols in oil had good oxidative stability at low temperatures,the loss rate increased rapidly in accelerated oxidation when the temperature was above 100℃.This study provides information for less loss of tocopherols and tocotrienols in oils.关键词
油脂/生育酚/生育三烯酚/稳定性/温度/加速氧化Key words
palm oil/tocopherols/tocotrienols/stability/temperature/accelerated oxidation分类
轻工纺织
