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Type: Artigo de periódico
Title: S-nitrosoglutathione incorporated in poly(ethylene glycol) matrix: potential use for topical nitric oxide delivery
Author: Seabra, AB
de Souza, GFP
da Rocha, LL
Eberlin, MN
de Oliveira, MG
Abstract: Incorporation of nitric oxide (NO) donors in non-toxic polymeric matrices can be a useful strategy for allowing topical NO delivery. We have incorporated the NO-donor S-nitrosoglutathione (GSNO) into a liquid poly(ethylene glycol) (PEG)/H2O matrix through the S-nitrosation of GSH by a NO/O-2 gas mixture. Kinetic measurements of GSNO decomposition associated with NO release were performed at 25, 35, and 45 degreesC in the dark and under irradiation with UV/Vis light,) lambda > 480 nm and). lambda = 333 nm. NO release from the liquid matrix to the gas phase was confirmed by mass spectrometry. The PEG/H2O matrix stabilizes GSNO leading to expressive reductions in the initial rates of thermal and photochemical NO release, compared to aqueous GSNO solution. This matrix effect is assigned to diffusional constrains imposed on the escape of the NO and GS radicals formed in the solvent cage. This effect allows the storage of PEG-GSNO formulations for extended periods (more than 65 days at freezer) with negligible decomposition. PEG-GSNO formulation seems therefore to be applicable in topical NO delivery and GSNO displays potential as a percutaneous absorption enhancer. Moreover, the rate of NO release can be locally increased by irradiation with visible light. (C) 2004 Elsevier Inc. All rights reserved.
Subject: nitric oxide
poly(ethylene glycol)
radical recombination
Country: EUA
Editor: Academic Press Inc Elsevier Science
Rights: fechado
Identifier DOI: 10.1016/j.niox.2004.09.005
Date Issue: 2004
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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