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Changes in speciation of copper(II) in reactions with epigallocatechin gallate (EGCG) and gallic acid (GA) as a function of pH have been investigated by multifrequency (X and S-band) EPR spectroscopy in the fluid and frozen states. The EPR spectra show the formation of three distinct mononuclear species with each of the polyphenols, and these are interpreted in terms of one mono- and two bis-complexes. However, di- or polymeric complexes dominate the Cu(II) speciation in the pH range 4-8, and it is only at alkaline pH values that these mononuclear complexes make appreciable contributions to the metal speciation.

Pirker, K.F., Baratto, M.C., Basosi, R., Goodman, B.A. (2012). Influence of pH on the speciation of copper(II) in reactions with the green tea polyphenols, epigallocatechin gallate and gallic acid. JOURNAL OF INORGANIC BIOCHEMISTRY, 112, 10-16 [10.1016/j.jinorgbio.2011.12.010].

Influence of pH on the speciation of copper(II) in reactions with the green tea polyphenols, epigallocatechin gallate and gallic acid

BARATTO, MARIA CAMILLA;BASOSI, RICCARDO;
2012-01-01

Abstract

Changes in speciation of copper(II) in reactions with epigallocatechin gallate (EGCG) and gallic acid (GA) as a function of pH have been investigated by multifrequency (X and S-band) EPR spectroscopy in the fluid and frozen states. The EPR spectra show the formation of three distinct mononuclear species with each of the polyphenols, and these are interpreted in terms of one mono- and two bis-complexes. However, di- or polymeric complexes dominate the Cu(II) speciation in the pH range 4-8, and it is only at alkaline pH values that these mononuclear complexes make appreciable contributions to the metal speciation.
2012
JOURNAL OF INORGANIC BIOCHEMISTRY
Pirker, K.F., Baratto, M.C., Basosi, R., Goodman, B.A. (2012). Influence of pH on the speciation of copper(II) in reactions with the green tea polyphenols, epigallocatechin gallate and gallic acid. JOURNAL OF INORGANIC BIOCHEMISTRY, 112, 10-16 [10.1016/j.jinorgbio.2011.12.010].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/24021
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