linear ionene polyquaternary cationic polymeric segments are bonded by means of the menshutkin reaction to biocompatible , extremely small , porous particles containing halide or tertiary amine sites which are centers for attachment of the segments . the modified beads in the form of emulsions or suspensions offer a large , positively - charged surface area capable of irreversibly binding polyanions such as heparin , dna , rna or bile acids to remove them from solution or of reversibly binding monoanions such as penicillin , pesticides , sex attractants and the like for slow release from the suspension .