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Three novel nano-silica dioxide (NSD) carriers with reactive aldehyde groups, i.e. NSD-1, NSD-2 and NSD-3, were firstly prepared through functionalization of the NSD material, and porcine pancreas lipase (PPL) was immobilized on the resulting carriers by using covalent coupling method. The activity recovery of immobilized PPL based on the carrier NSD-1, NSD-2 and NSD-3 reaches to 73%, 79% and 118%,...
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