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• W1975851808 endingPage "1456" @default.
• W1975851808 startingPage "1442" @default.
• W1975851808 abstract "The speciation study of the Zn(2+)/glutathione (GSH, H(3)G) and Zn(2+)/N-acetylcysteinylglycine (NAcCG, H(2)L) was performed in aqueous solution by means of potentiometry and ESI mass spectrometry. The ligand N-acetylcysteinylglycine was synthesized by protection/activation strategies. (1)H NMR data for the Zn(2+)/NAcCG system at different pH were also collected, to gain insight in the coordination modes for the ligand. The information collected for the NAcCG model ligand were used to propose the structure in solution for the Zn(2+)/GSH complexes. Dinuclear complexes of GSH with Zn(2+), which have never been proposed previously in the literature, were identified in solution and a model of their structure was proposed. Moreover, the Zn(2+) promoted deprotonation of the cysteinyl peptidic NH with formation of five membered (S,N(Cys)(-)) chelating rings was evidenced. The speciation study of the ternary Zn(2+)/GSH/NAcCG system was also performed, showing that the Zn(2+) does not bind preferentially to GSH in presence of NAcCG. The (1)H NMR protonation studies of both GSH and NAcCG were also performed, and a novel proton dissociation microconstant calculation procedure has been proposed and applied to GSH equilibria." @default.
• W1975851808 created "2016-06-24" @default.
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• W1975851808 date "2007-10-01" @default.
• W1975851808 modified "2023-10-16" @default.
• W1975851808 title "Glutathione and N-acetylcysteinylglycine: Protonation and Zn2+ complexation" @default.
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• W1975851808 doi "https://doi.org/10.1016/j.jinorgbio.2007.06.020" @default.
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