黄酮类化合物与α-羟乙基过氧自由基反应的脉冲辐解研究

doi:10.3866/PKU.WHXB201210232

Abstract

Abstract:

Lipid peroxidation (LPO) plays an important role in many pathological processes (such as hepatitis, hepatic sclerosis, atherosclerosis, cerebral hemorrhage and so on), and flavonoids are considered to be effective LPO-inhibitors. Thus we investigated the relationship between the chemical structure of flavonoids and the LPO activity and the antioxidant mechanism of flavonoids. In this work, α-hydroxyl ethyl peroxyl radicals were produced from radiolysis of aerated ethanol to model lipid peroxyl radicals. By detecting the decay of α-hydroxyl ethyl peroxyl radicals in the presence of different concentrations of flavonoids using pulse radiolysis, the reaction rate constants of α-hydroxyl ethyl peroxyl radicals with quercetin, rutin, catechin, and baicalin are determined for the first time. The antioxidant activity of these flavonoids decreases in the order: rutin > quercetin > baicalin > catechin. Flavone and pyrocatechol were used as model compounds for the different components in flavonoids and their reaction rate constants towards α-hydroxyl ethyl peroxyl radicals were (1.7±0.1)×10⁶ and (2.9±0.1)×10⁵ mol^-1·dm³· s^-1, respectively. The effect of chemical structure on the scavenging activity towards α-hydroxyl ethyl peroxyl radicals was investigated. The coexistence of the C₅-hydroxyl group in the A ring with the C₂＝C₃ in the C ring or the conjugated double bond of the B-C ring and the catechol group in the B ring provides the best antioxidant activity. In addition, the C₂＝C₃ in the C ring or the conjugated double bond of the B-C ring is more effective than the catechol group in the B ring, while the C₃-rutinose in the C ring has no obvious effect. Therefore, we conclude that the addition reaction between double bonds with peroxyl radicals plays an important role in the antioxidant activity of flavonoids in LPO.

Key words: Flavonoids, Anti-lipid peroxidation, Pulse radiolysis, Dynamics, Chemical structure

MSC2000:

O643.12

ZHANG Fu-Gen, ZHOU Han-Yang, PENG Jing, WU Ji-Lan. Reactions between Flavonoids and α-Hydroxyl Ethyl Peroxyl Radicals: a Pulse Radiolysis Study[J].Acta Phys. -Chim. Sin., 2013, 29(01): 199-204.

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Reactions between Flavonoids and α-Hydroxyl Ethyl Peroxyl Radicals: a Pulse Radiolysis Study

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