Role of ultra-violet radiation, mercury and copper on the stability of dissolved glutathione in natural and artificial freshwater and saltwater
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Non |
| Statut de publication | : | Publié |
| Année de publication | : | 2010 |
| Auteurs (4) | : | MOINGT Matthieu BRESSAC Matthieu BÉLANGER Dominic AMYOT Marc |
| Revue scientifique | : | Chemosphere |
| Volume | : | 80 |
| Fascicule | : | 11 |
| Pages | : | |
| DOI | : | 10.1016/j.chemosphere.2010.06.041 |
| URL | : | https://linkinghub.elsevier.com/retrieve/pii/s0045653510007150 |
| Abstract | : | The behavior and stability of dissolved reduced glutathione (GSH), an environmental antioxidant and metal transporter, is poorly known in natural waters. Glutathione oxidation rates were determined in both fresh- and brackish waters artificially submitted to different radiation wavebands. Photo-oxidation of GSH followed pseudo-first order kinetics, with half-lives ranging from 4 to 30 h in natural freshwater, and from 1.6 to 7 h in saltwater, with generally shorter persistence in UV-irradiated surface waters than in dark treatments. Chloride was shown to indirectly promote GSH photo-oxidation, probably through its role in the formation of radicals. The addition of Cu(II) to synthetic waters resulted in the rapid oxidation of GSH. The addition of Hg(II), a metal with strong affinity for thiols, protected GSH from oxidation by Cu(II) in the dark, but not under UV radiation. We conclude that UV-induced photo-oxidation is a key process altering the fate of GSH in natural waters. Also, the formation of stable GSH–Hg complexes could increase the bioavailability of Hg towards microorganisms in aquatic systems. |
| Mots-clés | : | - |
| Commentaire | : | - |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Moingt M, Bressac M, Bélanger D, Amyot M (2010) Role of ultra-violet radiation, mercury and copper on the stability of dissolved glutathione in natural and artificial freshwater and saltwater. Chemosphere 80 | doi: 10.1016/j.chemosphere.2010.06.041
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