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A kinetic study of the reactions of sulfate and dihydrogen phosphate radicals with epicatechin, epicatechingallate, and epigalocatechingallate

✍ Scribed by Laura S. Villata; Mónica C. Gonzalez; Daniel O. Mártire

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
517 KB
Volume
42
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

The bimolecular rate constants for the reactions of sulfate radicals with epicatechin (EC), epicatechingallate (ECG), and epigallocatechingallate (EGCG) were found to be (1.46 ± 0.06) × 10^9^, (1.20 ± 0.08) × 10^9^, and (1.04 ± 0.07) × 10^9^, respectively. The activation energy [E~A~ = 9 ± 3 kJ mol^−1^] and preexponential factor [A = (4.8 ± 0.6) × 10^10^] for the reaction of EC with the sulfate radical were measured in the temperature range 288–303 K. The phenoxyl radicals of EC (λ~max~ = 310 nm) were obtained both by the reaction of this flavonoid with the sulfate radicals and by photoionization. The measured bimolecular rate constants for the reactions of the dihydrogen phosphate radicals with EC, ECG, and EGCG were (7.8 ± 0.9) × 10^8^, (8.5 ± 0.4) × 10^8^, and (6.8 ± 0.4) × 10^8^, respectively. © 2010 Wiley Periodicals, Inc. Int J Chem Kinet 42: 391–396, 2010

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