Protein Binding Characteristics of Amphoteric Polymer Brushes Grafted onto Porous Hollow-Fiber Membrane
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Three types of ampholites containing dimethylamino and carboxyl groups, <I>i. e</I>., N (CH<SUB>3</SUB>) <SUB>2</SUB> (CH<SUB>2</SUB>) <I>n</I>COOH (<I>n</I>=1-3), were introduced into an epoxy-group-containing polymer brush grafted onto a porous hollow-fiber membrane with a porosity of 70% and pore size of 0.36 μm. Lysozyme was captured by the amphoteric polymer brush during the permeation of a lysozyme solution buffered with a carbonate buffer (pH 9.0) across the ampholite-immobilized porous hollow-fiber membranes. The N (CH<SUB>3</SUB>) <SUB>2</SUB> (CH<SUB>2</SUB>) <SUB>2</SUB> COOH-immobilized porous membrane exhibited a fivefold higher flux for the buffer solution and a 50-fold lower binding capacity for lysozyme at a lower molar conversion of the epoxy group into the amphoteric group, up to 17%, than the other two types of membranes.
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