抗氧剂对植物油氧化稳定性影响的高压差示扫描量热法评价

Evaluation of Oxidative Stability of Vegetable Oils with Added Antioxidants by Pressure Differential Scanning Calorimetry

利用高压差示扫描量热法（ＰＤＳＣ）研究了二烷基二硫代氨基甲酸锌（ＶＡＺ）、２，２’－亚甲基双（４－甲基－６－特丁基苯酚）（２２４６）、苯并三唑（ＢＴＺ）和二烷基对苯二胺（ＤＢＡ）４种抗氧添加剂对菜子油氧化稳定性的影响，得到了它们抗氧化作用的大小顺序。另外，根据阿仑尼乌斯公式计算了不同油样氧化反应的活化能，证明了ＰＤＳＣ是一种快速简便评价基础油氧化稳定性的方法，适用于抗氧添加剂配方的设计工作。

The oxidative stability of rapeseed oil with and without antioxidants was studied by using pressure differential scanning calorimetry(PDSC). The four antioxidants-zinc dialkyldithiocarbamate (VAZ), 2, 2'-methylene-bis- (4-methyl-6-tert-butyl) phenol(2246), benzotriazole(BTZ) and dialky- lamino-p-benzylamine (DBA) used for the protection of rapeseed oil from oxidation were ranked according to their anti-oxidation capability. In addition, activation energy of the oil samples was calculated by using Arrhenius equation, and the oxidation mechanism was discussed briefly. PDSC has been proven to be a fast and simple method for the evaluation of oil oxidative stability, and for the formulation of anti-oxidant formulae as well.