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Radical Scavenging by Flavonoid Antioxidants
Abstract
Aroxyl radicals of fifteen structurally distinct flavonoids were generated by attack of azide radicals (N3.) on the parent compounds dissolved in aqueous solution at pH 11.5. Generation rate constants were all found to be very high (2.4-8.8 x 10(9) dm3mol-1 s-1), whereas the decay rates differed considerably, ranging from 10(5) to 10(8) dm3mol-1 s-1. In most cases the spectral characteristics of the transient aroxyl radicals relate to structural features of the parent compounds and according to spectral similarities they can be classed in three distinct groups (with only two exceptions). Although the data do not conclusively prove that the biological function of flavonoids might be the scavenging of radicals, the very high rate constants of formation and the relative stability of some of the aroxyl radicals, are in support of such a hypothesis.
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Cited by
Structure-antioxidant activity relationships of flavonoids and phenolic acids
Rice-Evans, C. A., Miller, N. J., & Paganga, G. (1996) · Free Radical Biology and Medicine · doi:10.1016/0891-5849(95)02227-9 · Cited by 9,085
Middleton, E., Kandaswami, C., & Theoharides, T. C. (2000) · Pharmacological Reviews · doi:10.1016/s0031-6997(24)01472-8 · Cited by 4,882
Antioxidant Capacity of Tea and Common Vegetables
Cao, G., Sofic, E., & Prior, R. L. (1996) · Journal of Agricultural and Food Chemistry · doi:10.1021/jf9602535 · Cited by 1,295
Santos-Buelga, C., & Scalbert, A. (2000) · Journal of the Science of Food and Agriculture · doi:10.1002/(sici)1097-0010(20000515)80:7<1094::aid-jsfa569>3.0.co;2-1 · Cited by 1,258
Interactions of Flavonoids with Iron and Copper Ions: A Mechanism for their Antioxidant Activity
Mira, L., Tereza Fernandez, M., Santos, M., Rocha, R., Helena Florêncio, M., & Jennings, K. R. (2002) · Free Radical Research · doi:10.1080/1071576021000016463 · Cited by 1,043
Metadata
- Authors
- Bors, W., & Saran, M.
- Venue
- Free Radical Research Communications
- Publisher
- Informa UK Limited
- Published
- 1987-01
- Volume
- 2
- Issue
- 4-6
- Pages
- 289-294
- ISSN
- 8755-0199 (ISSN-L)
- OpenAlex
- W2050733923
- Cited by
- 478
- References
- 0
- FWCI
- 6.44
- Type
- journal article
- Language
- en
- Open access
- closed
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