Kinetics of sorption and desorption of lisozyme of ultrafiltration membranes based on aromatic polyamides

Abstract

An attempt to value the presence and the degree of influence of electrosurface properties of porous
membranes based on poly-m-phenylenisophthalamide (РА) and aromatic co-polyamide with 10 mol. %
sulfonate-containing fragments (РА-10(-)) on lysozyme sorption / desorption kinetics has been done in
present work. Studies were conducted in static mode and under ultrafiltration conditions. To describe the
experimental kinetic dependences the modified diffusion model and sorption model controlled by interaction
protein/membrane have been used. The influence of protein/membrane electrostatic interactions on
mechanism, speed and the depth of sorption has been shown. The activation energies of protein
sorption/desorption from the surface of the test samples were calculated; their values were ~ 40/50 kJ/mol
and ~ 20/40 kJ/mol for the PA and PA-10 (-), respectively. The results obtained offer the possibility to
control the sorption process in case of practical use of the synthesized membranes.