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The antioxidant properties of theaflavins and their gallate esters — radical scavengers or metal chelators?
Abstract
The antioxidant properties of theaflavins and their gallate esters were studied by investigating their abilities to scavenge free radicals in the aqueous and lipophilic phases. The total relative antioxidant activities in the aqueous phase were assessed by measuring their direct ABTS·+ radical scavenging abilities, and by their efficacies in inhibiting the degradation of deoxyribose induced by iron. The propensities for enhancing the resistance of LDL to oxidation mediated by Cu 2+ were also measured. The results show that the hierarchy of reactivity of these compounds as antioxidants is: theaflavin digallate > 3′‐monogallate=3‐monogallate > theaflavin. Spectroscopic studies show that all the compounds chelate iron and copper; enhanced absorbance in the visible region is observed in the case of the iron‐digallate complex, but not with copper.
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Cited by
Total Antioxidant Capacity of Teas by the Ferric Reducing/Antioxidant Power Assay
Benzie, I. F. F., & Szeto, Y. T. (1999) · Journal of Agricultural and Food Chemistry · doi:10.1021/jf9807768 · Cited by 756
Kell, D. B. (2009) · BMC Medical Genomics · doi:10.1186/1755-8794-2-2 · Cited by 554
Andreu, G. P., Delgado, R., Velho, J. A., Curti, C., & Vercesi, A. E. (2005) · European Journal of Pharmacology · doi:10.1016/j.ejphar.2005.03.007 · Cited by 122
Liu, L. ‐., Lee, H. ‐., Shih, Y. ‐., Chyau, C. ‐., & Wang, C. ‐. (2008) · Journal of Food Science · doi:10.1111/j.1750-3841.2008.00801.x · Cited by 115
Chen, C.-N., Liang, C.-M., Lai, J.-R., Tsai, Y.-J., Tsay, J.-S., & Lin, J.-K. (2003) · Journal of Agricultural and Food Chemistry · doi:10.1021/jf034634b · Cited by 112
Metadata
- Authors
- Miller, N. J., Castelluccio, C., Tijburg, L., & Rice-Evans, C.
- Venue
- FEBS Letters
- Publisher
- Wiley
- Published
- 1996-08-19
- Volume
- 392
- Issue
- 1
- Pages
- 40-44
- ISSN
- 0014-5793 (ISSN-L)
- 1873-3468
- OpenAlex
- W2084995559
- Cited by
- 289
- References
- 0
- FWCI
- 6.65
- Type
- journal article
- Language
- en
- Open access
- closed
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