木犀草素铜配合物的抗氧化活性与配位模式研究
2021-06-17臧昕王家文周坤鹏厉诗娴林玮李婧
臧昕 王家文 周坤鹏 厉诗娴 林玮 李婧



摘 要:黄酮类金属配合物具有多种生物和药理活性。通过木犀草素及其铜配合物与DPPH·、·OH、O2·-作用,探讨木犀草素及其铜配合物的抗氧化活性。结果显示,铜配合物较木犀草素对·OH的清除能力减弱较为明显,对DPPH·、O2·-的清除能力下降不明显。这进一步验证了木犀草素以4-C=O和5-OH与铜离子配位,配位模式与抗氧化活性密切相关。
关键词:木犀草素;铜配合物;抗氧化活性;配位模式
中图分类号 O657.3;R285.5文献标识码 A文章编号 1007-7731(2021)10-0018-03
Study of Antioxidant Activity and Coordination Mode of Luteolin Copper Complex
ZANG Xin et al.
(Heilongjiang Bayi Agricultural University, College of Life Science and Biotechnology, Daqing 163319,China)
Abstract: Flavonoid metal complexes have many biological and pharmacological activities. In this research, luteolin and its copper coordination complex were studied antioxidant activity by examining the free radical scavenging effects through reactions with DPPH·, ·OH and O2·-. The results showed that radical scavenging ability of luteolin copper complex on ·OH was weakened obviously compared with luteolin, while the activities on DPPH· and O2·- were slightly lower than that of luteolin. The experiments confirm that luteolin is coordinated with copper ion via 4-C=O and 5-OH, the coordination mode is highly related to the antioxidant activity.
Key words: Luteolin; Copper complex; Antioxidant activity; Coordination mode
木犀草素(luteolin)是具有C6-C3-C6结构的典型黄酮类化合物,多存在于木犀草、金银花、菊花、荆芥等草本植物中,不仅具备抑制肿瘤生长、减少激素分泌、抗菌、抗过敏、抗病毒的生物活性,也可显著抑制TNF-α(肿瘤坏死因子)和IL-6(白细胞介素),同时促进炎症细胞中Nrf2的表达,使氧化应激状态维持较低水平,从而发挥抗氧化作用[1-3]。由于木犀草素的3′、4′、5和7位上均含有羟基,因此将其作为配体与金属离子络合形成配合物,所得配合物在裂解DNA、杀灭癌细胞、清除自由基等生物活性方面均有一定的改善作用[4]。 木犀草素可以与Fe3+、Mn2+、Cr3+、Zn2+、Ca2+等多种金属元素进行配合[5-6],木犀草素中4-C=O和5-OH、3′-OH和4′-OH可以分别与金属离子配位形成配合物。关于配位化合物结构的分析,目前多从红外、紫外、元素分析等表征中推断木犀草素与金属离子的配位形式。为此,笔者应用木犀草素与新戊酸铜或苯甲酸铜制备木犀草素铜配合物,分析论证配合物的结构(图1)[7]。为研究木犀草素铜配合物的抗氧……
