Adsorption behavior of Urokinase by the polypropylene film with amine, hydroxylamine and polyol groups

For the purpose of the recovery of urokinase. the polypropylene (PP) films were modified by radiation-induced grafting of glycidylmethacrylate (GMA) and subsequent chemical modification of epoxy group of poly-GMA graft chains. The physical and chemical properties of the irradiated PP film, GMA-grafted PP film and the PP films modified with trimethylamine (TMA). hydroxylamine (HA). diethanolamine (DEA). and tri(hydroxymethyl)aminomethane (THMAM) were investigated by IR. SEM. and XPS. The adsorption of urokinase for the PP films modified with TMA, HA. DEA, and THMAM group were examined under various conditions of the functional group content, pH value and salt. It increased with increasing the content of functional group. The adsorption behavior of the PP films modified for different functional groups was in the following order. TMA > DEA > THMAM > HA. The adsorption of urokinase by the PP films with various functional groups at pH = 7.4 were higher than that at pH = 9.0. In TMA, DEA, and THMAM groups, the adsorption of urokinase without salts was also higher than those with salts. (C) 2001 Elsevier Science Ltd. All rights reserved.