Pulse radiolysis study of the reactions of catechins with nitrogen dioxide |
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| Authors: | Jerzy L. Gebicki Piotr Meisner Katarzyna Stawowska Lidia Gebicka |
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| Affiliation: | 1. Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, Russian Federation;2. Kazan (Volga region) Federal University, Kremlyovskaya str., 18, 420008 Kazan, Russian Federation;3. Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva 84105, Israel;4. Ilse Katz Institute for Nanotechnology, Ben Gurion University of the Negev, Beer Sheva 84105, Israel |
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| Abstract: | Nitrogen dioxide (?NO2), one of the oxidizing radicals formed in vivo is suspected to play a role in various pathophysiological processes. The reactions of ?NO2 with dietary catechins, the group of flavonoids present in high amounts in green tea and red wine, have been investigated by pulse radiolysis method. The kinetics of the reaction of ?NO2 with gallic acid have been also studied for comparison. The spectra of transient intermediates are presented. The rate constants of the reaction of ?NO2 with catechin, epigallocatechin, epigallocatechin gallate and gallic acid determined by the competition method with 2,2’-azinobis-(3-ethylbenzthiazoline-6-sulfonate) at pH 7.0 and room temperature have been found to be 0.9, 1.0, 2.3 and 0.5×108 M?1 s?1, respectively. The values for catechins are among the highest reported for the reactions of ?NO2 with non-radical compounds. |
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