为探究抗氧剂抗氧化活性，采用Materials Studio 7.0版本模拟软件Dmol3模块对自由基捕捉剂类抗氧剂中的酚类和胺类抗氧剂分子进行模拟计算分析。通过对4种典型抗氧剂分子的前线轨道及X-H键解离能结果进行分析可知，2，6-二叔丁基对甲酚抗氧化活性略好于4，4亚甲基双（2，6-二叔丁基苯酚），N-苯基-α-萘胺抗氧化活性明显高于4-丁基-4'-辛基二苯胺，且在此4种抗氧剂中酚类抗氧剂活性略高于胺类。在典型抗氧剂分子的基础上，探究取代基变化对分子抗氧化活性的影响，得出取代基对分子的抗氧化活性有显著影响、且取代基碳数越多抗氧剂分子越活泼的结论。

In order to explore the activity of antioxidant,the molecules of phenolic and amine antioxidants among free radical scavenging antioxidants are simulated and analyzed by using Dmol3 module of Material Studio 7.0 simulation software.Through analyzing the frontier orbits and X-H bond dissociation energies of four typical antioxidant molecules,it is found that the antioxidative activity of 2,6-di-tertbutyl-4-methyl phenol is slightly better than that of 4,4-methylene-bis(2,6-di-tertbutyl phenol),and that of N-phenyl-alpha-naphthylamine is significantly higher than that of 4-butyl-4'-octyl diphenylamine.Among the four kinds of antioxidant,phenolic antioxidants exhibit a slightly higher activity than amine antioxidants.On the basis of typical antioxidant molecules,the effects of substituents on the antioxidative activity of antioxidant molecules are investigated.It is concluded that substituents have significant effects on the antioxidative activity of antioxidant molecules,and the more carbon number of substituents,the more active the antioxidant molecules are.

胡雪莹(1994-),女,硕士,研究方向为油品氧化安定性