Reaction between 7,8-dihydropterins and hydrogen peroxide under physiological conditions

M. LAURA DÁNTOLA; TOBIAS M.SCHULER; M. PAULA DENOFRIO; MARIANA VIGNONI; ALBERTO L. CAPPARELLI; CAROLINA LORENTE; ANDRÉS H. THOMAS

TETRAHEDRON

Elsevier

Año: 2008 vol. 64 p. 8692 - 8699

0040-4020

Abstract:In vitiligo, a common skin disorder that produces white patches of depigmentation, 7,8-dihydropterins accumulate in the presence of high concentration of H2O2. In this work, we present a study of the reaction between 7,8-dihydropterins and H2O2. The rate of the reaction, as well as the products formed, strongly depend on the chemical structure of the substituents. Electron-donor groups as substituents are the most reactive derivatives and undergo oxidation of the pterin moiety. The corresponding bimolecular rate constants at 37 C in neutral aqueous solutions are reported. The biological implications of the results obtained are also discussed