Abstract
A coated ultrafiltration membrane was developed which allows the highly selective extraction of lactalbumin from a whey protein mixture. A permeate containing only lactalbumin was obtained using inorganic membranes coated with polyvinylimidazole derivatives containing both ionic and hydrophobic groups. The phenomena involved were analysed with high-performance liquid chromatographic supports bearing similar coatings. With the hydrophobic layer, the selectivity enhancement can be explained through mixed interactions with whey proteins; increasing fouling is due to both lactoglobulin and lactalbumin contributions to the build-up of the boundary layer at the wall of the derivatized membrane.
Published Version
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