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• W2000433383 abstract "Les auteurs mettent en évidence par potentiométrie l'existence en solution de complexes entre le thiamine-diphosphate et les ions Ni 2+ , dans les deux zones de pH situées pour l'une autour de pH 6.5, pour l'autre autour de pH 9. Ils exposent une méthode de calcul des constantes de stabilité. Les sites de complexation sont précisés, l'azote N l' de la pyrimidine et la chaine pyrophosphorique après déprotonation. L'association avec la pyrimidine est 12 fois plus faible que l'interaction avec les groupements phosphate. The divalent metal ion-thiamine diphosphate (TDP) complexes are of potential interest because such complexes are directly involved in enzymatic reactions. The binding of Ni 2+ to TDP has been studied in order to gain some insight in the TDP-metal interactions which could help to understand the role of the metal ions in general in the enzymatic processes. A technique of pH titration is developed which brings definitive proof of metal-TDP bonding in aqueous solutions. The results indicate that the metal ion interacts both with the pyrophosphate group and the pyrimidine ring. The complexation decreases the pK for the phosphate ionization. The ring nitrogen is a some 12 times weaker ligand of Ni 2+ than is pyrophosphate. The stability constants obtained for an ionic strength 0.5 in tetramethylammonium bromide are reported; the maximum of the apparent formation constant, between pH 4.5 and pH 7.5, occurs for pH 6.9. The poor solubility of nickel hydroxyde is responsible for increasing interaction in alcaline solution." @default.
• W2000433383 created "2016-06-24" @default.
• W2000433383 creator A5065380819 @default.
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• W2000433383 date "1980-01-01" @default.
• W2000433383 modified "2023-10-17" @default.
• W2000433383 title "Equilibres de complexation du thiamine-diphosphate avec les ions divalents-constantes de formation" @default.
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• W2000433383 doi "https://doi.org/10.1016/s0300-9084(80)80259-8" @default.
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