测氧法研究受阻酚抗氧剂的抗氧化活性及反应动力学

摘要

The antioxidant activities of four commercial antioxidants were evaluated by oxygen uptake mea-surement, and the analysis of the scavenging ROO· reaction kinetics of them was carried out. The results showed that four commercial antioxidants exhibited good ROO· scavenging activities, and the antioxidant activities in-creases with the increase of phenol hydroxyl group concentration. At the same phenol hydroxyl group concentration of antioxidant, the decrease of inhibition rate constant kinh followed the sequence of antioxidant 1098, antioxidant BHT, antioxidant 1010 and antioxidant 1076. Antioxidant activity of antioxidant was closely related to the number of functional group and electron-donating capacity of the para substituent. The intra-molecular complex antioxi-dant with phenol groups and amine has shown more excellent antioxidant activity.%采用测氧法考察了4种市售受阻酚抗氧剂的抗氧化活性，同时对其清除ROO·反应进行了动力学分析。结果表明：4种受阻酚抗氧剂对ROO·均具有良好的清除作用，并且抗氧化活性随着酚羟基浓度增加而增大。在同等的酚羟基浓度下，抗氧剂的抑制速率常数kinh值从大到小的顺序为抗氧剂1098、抗氧剂BHT、抗氧剂1010、抗氧剂1076。抗氧剂的抗氧化活性与功能基团的个数和对位取代基的供电性密切相关，酚胺复合型抗氧剂体现出更高的抗氧化活性。