The sorption of pectins of different origin on a MA-40 anion-exchange membrane has been studied. It has been revealed that the dependence of specific sorption on equilibrium pectin concentration is step-like. A relationship between the structural characteristics of the membrane and the concentration of pectin sorbed on it in the solution and the molecular weight of pectin has been determined. The sorption process has been found to be most intense in the region of small nanopores of the membrane. The possibility in principle of regenerating the membranes from the sorbed pectin molecules has been shown.