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Increased stability of S-nitrosothiol solutions via pH modulations
István Hornyák1, Krisztina Marosi, Levente Kiss
1Semmelweis University, Department of Human Physiology and Clinical Experimental Research, Budapest, Hungary. istvan.hornyak@eok.sote.hu
Optimizing pH to mildly basic conditions (8.4-8.8) significantly slows the decomposition of S-nitrosothiols (RSNOs). This stabilization, especially in polymer matrices, preserves nitric oxide-releasing capacity for potential topical vasodilator therapies.
Area of Science:
- Biochemistry
- Materials Science
- Pharmacology
Background:
- S-nitrosothiols (RSNOs) are nitric oxide donors with potential as topical vasodilators.
- Rapid RSNO decomposition limits their therapeutic application.
- Understanding factors influencing RSNO stability is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the impact of pH on the formation and decomposition of S-nitrosoglutathione (GSNO), S-nitroso-N-acetylcysteine (SNAC), and S-nitroso-3-mercaptopropionic acid (SN3MPA).
- To evaluate the stability of GSNO within poly(ethylene glycol)/poly(vinyl alcohol) matrices at different storage pH levels.
- To correlate RSNO stability with their vasodilatory effects.
Main Methods:
- Spectrophotometric quantification of S-nitrosothiol concentrations.
- Synthesis of RSNOs using acidic sodium nitrite solutions.
- Assessment of dermal blood flow using a laser Doppler scanning method.
- Incorporation of GSNO into PVA/PEG polymer matrices for stability studies.
Main Results:
- Mildly basic pH (8.4-8.8) significantly reduced the decomposition rate of all tested RSNOs.
- GSNO incorporated in PVA/PEG matrices at basic pH retained 46.8% of its initial concentration after 25 days.
- Topical application of stabilized GSNO increased dermal blood flow by over 200% in human subjects.
Conclusions:
- Adjusting pH to mildly basic conditions enhances the stability of S-nitrosothiols in aqueous solutions and polymer matrices.
- Stabilized GSNO in polymer gels maintains therapeutic efficacy for topical vasodilation.
- This pH-dependent stabilization strategy offers a promising approach for developing RSNO-based therapeutics.
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