[Thermodynamic parameters characterizing interaction between ligand molecules adsorbed on a polymer].

Procedure was elaborated for recognizing potentials of paired interactions between ligand molecules adsorbed on the polymer. A method is proposed for describing such interactions by means of the potentials of simplest shapes, rectangular and trapezoidal ones. It is shown that when the interactions cover the distances much larger than the mean ones between the adsorbed molecules, the adsorption is described by the expression specific for noncooperative binding of the ligands. On this basis the method for analysing the experimental isotherms of adsorption is developed. It permits estimation of the interaction energy between the ligand adsorbed molecules and specific distance to which these interactions are distributed. This method is applied for analysing experimental isotherms of adsorption of antibiotic distamycin A on poly (dG) . poly (dC).