Effects of pH and Metal Ions on Antioxidative Activities of Catechins | Zendy

Midori Kumamoto | Zendy; Tamiyoshi Sonda | Zendy; Kinuyo NAGAYAMA | Zendy; Masaaki Tabata | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

Effects of pH and Metal Ions on Antioxidative Activities of Catechins

Author(s) -

Midori Kumamoto,

Tamiyoshi Sonda,

Kinuyo NAGAYAMA,

Masaaki Tabata

Publication year - 2001

Publication title -

bioscience biotechnology and biochemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.509

H-Index - 116

eISSN - 1347-6947

pISSN - 0916-8451

DOI - 10.1271/bbb.65.126

Subject(s) - chemistry , pyrogallol , catechol , gallate , metal ions in aqueous solution , metal , inorganic chemistry , antioxidant , copper , ion , catechin , nuclear chemistry , polyphenol , biochemistry , organic chemistry

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.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research