Colloidal Adsorption of Bovine Serum Albumin on Porous Polypropylene-g-Poly(2-hydroxyethyl methacrylate) Membrane

Abstract

To understand the effects of protein adsorption on filtration performance, poly(2-hydroxyethyl methacrylate) (PHEMA) was grafted by the γ-ray preirradiation process onto the porous surface of a polypropylene (PP) membrane. The colloidal filtration of such membranes was discussed with respect to the correlation between the adsorption of the bovine serum albumin (BSA) proteins and the variation of physical properties of the PP-graft-PHEMA (PP-g-PHEMA) membrane surface. The specific resistance (αc) of the protein layer formed during filtration was obtained by line fitting through the filtration experimental results, using the colloidal filtration model proposed by Carman. The existence of PHEMA gave much faster rates of permeation than those of the original PP membrane because of the more or less dilute BSA protein concentration at the PHEMA layer. It was confirmed from the filtration experiment that the PHEMA layer grafted on the surface of the membrane prevented the intimate contact of BSA proteins with th...