期刊
REDOX REPORT
卷 16, 期 6, 页码 242-247出版社
MANEY PUBLISHING
DOI: 10.1179/1351000211Y.0000000015
关键词
Flavonoids; Free radical scavengers; Hydroxyl radical; Iron chelating agents; Reactive oxygen species
资金
- Lise Meitner fellowship of the Austrian Science Fund [FWF M920-B03]
Objectives: Flavonoids are ubiquitous phenolic plant metabolites. Many of them are well known for their pro- and antioxidant properties. Myricetin has been reported to be either a potent antioxidant or a pro- oxidant depending on the conditions. The reaction conditions for the pro- and antioxidant activities were therefore investigated using variations of the deoxyribose degradation assay systems. Methods: The deoxyribose degradation assay systems were conducted as follows; H(2)O(2)/Fe(III)/ascorbic acid, H(2)O(2)/Fe(III), Fe(III)/ascorbic acid, and Fe(III). Each system was carried out in two variants, FeCl(3) (iron ions added as FeCl(3)) and FeEDTA (iron added in complex with ethylenediaminetetraacetic acid). Results: When ascorbic acid was present, myricetin showed antioxidant properties, especially when it occurred in complex with iron. In ascorbic acid-free systems, pro- oxidant activities prevailed, which where enhanced if iron was in complex with EDTA. Discussion: Myricetin's antioxidant activity depends on both the reactive oxygen species (ROS) scavenging and iron ions chelation properties. The pro- oxidative properties are caused by reduction of molecular oxygen to ROS and iron(III) to iron(II). Myricetin is able to substitute for ascorbic acid albeit less efficiently.
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