The treatment of chronic diseases requires highly effective medication with minimal side-effects. The peptide hormone insulin plays a key role in the therapy of diabetes. As the number of people suffering from diabetes mellitus is steadily on the increase, the quantities of insulin produced have to rise accordingly. Nowadays, insulin is synthesized on a large scale with recombinant microorganisms. To use the protein molecules as active ingredients they are purified in a time-consuming and costly multi-stage process. Up to 50 percent of the manufacturing costs of protein therapeutics are incurred during the purification process. By means of effective artificial adsorbers or receptors which would reversibly bind the insulin, purification could be greatly simplified and thus become highly economic.