The effect of copper ions on adsorption of histamine and histidine on the surface of highly dispersed silica

The effect of copper ions on the adsorption of histamine and histidine on the surface of highly dispersed silica from aqueous solutions is studied. It is shown that the formation of complex particles in solution determines the character of adsorption of these biomolecules. The equilibrium constants of the formation of ternary surface complexes, where silanol groups of silica act as a ligand, are calculated. It is shown that, in such complexes, nitrogen atoms of either histamine or histidine enter into the inner coordination sphere of copper ion.