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Effects of pH and Metal Ions on Antioxidative Activities of Catechins
Open accessAbstract
The Effects of pH on antioxidative activities of catechol, pyrogallol, and four catechins, and effects of metal ions (Al3+, Ca2+, Cd2+, Co2+, Cr3+, Cu2+, Fe2+, Fe3+, K+, Mg2+, Mn2+, Na+, and Zn2+) on antioxidative activities of (-)-epigallocatechin gallate (EGCG) were studied by an oxygen electrode method. The antioxidative activities of catechins were high and constant at pH 6-12, but decreased in acidic and strong alkaline solutions. Copper(II) ion the most strongly increased the antioxidative activity of EGCG among these metal ions examined, but iron(II) ion largely inhibited the antioxidative activity of EGCG. These effects are discussed considering the formation of metal complexes with catechins and the change in oxidation potentials.
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Cites
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
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Evaluation of Aluminium Complexation Reaction for Flavonoid Content Assay
Pękal, A., & Pyrzynska, K. (2014) · Food Analytical Methods · doi:10.1007/s12161-014-9814-x · Cited by 982
Antioxidant properties of catechins: Comparison with other antioxidants
Grzesik, M., Naparło, K., Bartosz, G., & Sadowska-Bartosz, I. (2018) · Food Chemistry · doi:10.1016/j.foodchem.2017.08.117 · Cited by 478
Wojtunik-Kulesza, K., Oniszczuk, A., Oniszczuk, T., Combrzyński, M., Nowakowska, D., & Matwijczuk, A. (2020) · Nutrients · doi:10.3390/nu12051401 · Cited by 458
Mandel, S., Weinreb, O., Amit, T., & Youdim, M. B. H. (2004) · Journal of Neurochemistry · doi:10.1046/j.1471-4159.2003.02291.x · Cited by 377
Metadata
- Authors
- KUMAMOTO, M., SONDA, T., NAGAYAMA, K., & TABATA, M.
- Venue
- Bioscience, Biotechnology, and Biochemistry
- Publisher
- Oxford University Press (OUP)
- Published
- 2001-01
- Volume
- 65
- Issue
- 1
- Pages
- 126-132
- ISSN
- 0916-8451 (ISSN-L)
- 1347-6947
- OpenAlex
- W2049728393
- Cited by
- 275
- References
- 1
- FWCI
- 4.15
- Type
- journal article
- Language
- en
- Open access
- bronze
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- KUMAMOTO, M., SONDA, T., NAGAYAMA, K., & TABATA, M. (2001). Effects of pH and Metal Ions on Antioxidative Activities of Catechins. Bioscience, Biotechnology, and Biochemistry. https://doi.org/10.1271/bbb.65.126
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