Magnetic nanoparticles with surfaces modified with chitosan–poly[N-benzyl-2-(methacryloxy)-N,N-dimethylethanaminium bromide] for lipase immobilization

Superparamagnetic nanoparticles were surface-modified with a mixture of two polymers for lipase immobilization. Magnetite (Fe3O4)–chitosan (CS)–poly[N-benzyl-2-(methacryloxy)-N,N-dimethylethanaminium bromide] (PQ) nanoparticles with various polymers weight ratios were prepared by co-precipitation method via glutaraldehyde CS cross-linking reaction. Both of polymers have been successfully coated on the surface of magnetite nanoparticles and characterized. Prepared nanoparticles were also used for lipase immobilization. Obtained results demonstrate that application of the support prepared with the use of polymeric quaternized ammonium salt (CS–PQ (1:1)) allows to obtain high activity recovery (higher than 80%) in comparison with other tested nanoparticles.