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- W2077820079 abstract "Complexation equilibria between Al(III) and (−)-epigallocathechin gallate (EGCG) in the presence of acetate buffer have been studied by spectrophotometry. The method is based on the competition between EGCG and buffer ligands for Al(III) ions. The apparent formation constant of the EGCG complex for Al(III), which could be determined by measuring the absorbance of the free EGCG, decreased with increasing acetate ion concentration at a fixed pH. This phenomenon has been quantitatively investigated and both types of complexes (EGCG and acetate) could be analyzed. The apparent formation constant of Al(III) complex with EGCG also decreased with decreasing pH at a fixed acetate ion concentration. The pH dependence of the apparent formation constant indicates the 1:1 competition between metal ions and hydrogen ions for the binding site of EGCG. The intrinsic formation constant of Al-EGCG complex, the proton association constant of EGCG and the formation constant of Al-acetate complex are found to be log K Al-EGCG = 7.6 ± 0.1, log K H-EGCG = 7.65 ± 0.03 and log K Al-acetate = 2.07 ± 0.05 by a graphical analysis." @default.
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- W2077820079 date "1999-01-01" @default.
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- W2077820079 title "Complexation of aluminium with (−) -epigallocathechin gallate studied by spectrophotometry" @default.
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- W2077820079 doi "https://doi.org/10.1016/s0162-0134(98)10087-9" @default.
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