The adsorption noted in this case most probably results from hydrogen bonding between the alcohols' hydroxyl groups and hydrophilic functional groups on the B-type polymer. Polyethylene Glycols . Adsorption of PEG solutes by B-type resin was similar to that of alcohols. Again, the hydroxyl end groups on these molecules probably hydrogen bond with the hydrophilic moieties on the polymer. It is also conjectured that the long, linear conformation of these molecules allows hydrophobic interactions between hydrophobic regions of the B-type polymer and the backbone of the PEG solutes.
Results show that saccharide retention time decreases with increasing molecular weight.
This behavior is not completely understood at the present. It is believed that glucose coordinates with metal cations contained in the B-type polymer. Larger saccharides may be unable to coordinate as effectively with metallic moieties in the B-type polymer. Ionic Compounds . This suggests that the membrane discriminates between monovalent and divalent salts on the basis of both ionic size and charge repulsion.