H. N. Aliyu and J. NaÃÂ¢Ãâ¬Ãâ¢aliya
Potentiometric Studies on complexes formed by essential metals (Cr, Mn, Fe, Co, Ni, Cu and Zn) and amino acids (alanine, arginine, asparagines, glycine, histidine, lysine, methionine, phenylamine, proline, threonine, tryptophan and valine) have been carried out. The dissociation constants of the amino acids (, the stepwise formation constants and the overall stability constants of the metal (II) amino acid complexes were determined. The dissociation constants of the amino acids determined are; alanine (10.29), arginine (12.02), asparagine (9.39), glycine (9.87), histidine (7.01), lysine (9.28), methionine (9.68), phenylalanine (9.61), proline (10.53), threonine (10.31), tryptophan (9.77), and valine (10.28). The ratio of metal to amino acid determined for the complexes is 1:3, except for Cu (II) and Zn (II), which is 1:2. The Stepwise Stability Constants of the complexes were determined are found to decrease in the order K1 > K2 > K3 for all the complexes. The value of overall stability constant (β) of each complex obtained is relatively high, indicating good stability for the complexes.
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