Theoretical and experimental analysis of the antioxidant features of diarylhydrazones
作者:Swarada Peerannawar、William Horton、Anne Kokel、Fanni Török、Marianna Török、Béla Török
DOI:10.1007/s11224-016-0867-x
日期:2017.4
Structural and energetic features of a series of 15 diarylhydrazone derivatives were studied via density functional theory (DFT) in order to identify the key features that most likely contribute to their antioxidant effect. Theoretical calculations were carried out at the B3LYP/6-31G(d,p) level. The calculated physicochemical parameters included the ionization potential, N-H dissociation enthalpy, proton affinity, HOMO/LUMO energies, and the band gaps of the most stable conformation of the compounds. To assess the contribution of these factors to the in vitro activity, the compounds were synthesized and their antioxidant activity was also determined in three commonly used assays. The hydrazones were evaluated for their radical scavenging against the 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS), and peroxyl (ORAC assay) radicals. The experimental radical scavenging data of the compounds have been then plotted against the physicochemical characteristics and based on the obtained fits conclusions have been drawn regarding the relative importance of the respective factors.
通过密度泛函理论(DFT)研究了一组15种二芳基酰肼衍生物的结构和能量特征,以确定最可能对其抗氧化效果产生贡献的关键特征。理论计算采用了B3LYP/6-31G(d,p)级别。计算的物化参数包括电离势、N-H解离焓、质子亲和力、最高占据分子轨道/最低未占据分子轨道能量以及化合物最稳定构象的能隙。为了评估这些因素对体外活性的贡献,合成了这些化合物,并在三种常用试验中测定了它们的抗氧化活性。这些酰肼类化合物在自由基清除方面进行了评估,分别针对2,2-二苯基-1-苦基肼(DPPH)、2,2'-偶氮双(3-乙基苯并噻唑啉-6-磺酸)(ABTS)和过氧自由基(ORAC试验)。然后,将化合物的实验自由基清除数据与物化特性相对比,并根据所得拟合结果得出了关于各因素相对重要性的结论。