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- W2056511615 abstract "Difference spectrophotometry was used to investigate the effect of different ions and buffer systems on the binding of the anti-inflammatory drug tenoxicam to human serum albumin (HSA). Chloride anions, as well as sodium cations, were found to decrease the binding affinity. The effect of chloride ions was greater on the primary binding constant K1, while sodium ions had a greater effect on the secondary binding constant K2. The number of binding sites n1 and n2 were not affected except at 0.12% HSA, for which the presence of sodium ions halved n2. Potassium ions significantly increased K1. The presence of potassium instead of sodium ions increased binding affinity at lower HSA concentrations. The number of binding sites n1 and n2 were fewer in presence of potassium than in the presence of sodium ions except at 0.12% HSA. The divalent calcium and magnesium cations increased the binding affinity of HSA to tenoxicam, with a greater effect on K1. The effect of magnesium ions on K1 occurred when the MgCl2 concentration was increased to 3 and 9 mM, with the former seeming to be a critical concentration. The number of primary binding sites n1 was not affected by calcium ions, but was halved by 1 mM MgCl2. Both calcium and magnesium cations decreased n2, which was halved when the concentration of either cation was increased to 9 mM. The effect of buffer systems on tenoxicam binding to HSA was dependent on HSA concentration. The value of K1 was higher in Sorensen's phosphate buffer than in Tris [tris(hydroxymethyl) aminomethane HCl] buffer when the HSA concentration was 0.04% and 0.16%, while the reverse was observed at 0.08% and 0.12% HSA. The other binding parameters (K2, n1, and n2) were higher in Sorensen's phosphate than in Tris buffer. However; at certain HSA concentrations, the values of such parameters were comparable in both buffer systems." @default.
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- W2056511615 date "1999-01-01" @default.
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- W2056511615 title "Using Difference Spectrophotometry to Study the Influence of Different Ions and Buffer Systems on Drug Protein Binding" @default.
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- W2056511615 doi "https://doi.org/10.1081/ddc-100102233" @default.
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