Triacylglycerol lipase from Pseudomonas cepacia and Fe3O4 magnetic nanoparticles were encapsulated simultaneously within biomimetic silica through the catalysis of polyallylamine. The encapsulation efficiency reached 96% with an activity recovery of 51%. After 5 h at 37A degrees C, the activities of the free and encapsulated lipases decreased by 77 and 16%, respectively. Addition of 10 and 15 mol% trimethylmethoxysilane to tetramethoxysilane during encapsulation doubled the lipase activity while inclusion of 50 and 60 mol% gamma-(methacryloxypropyl)-trimethoxysilane tripled the activity. Thus, such encapsulation not only stabilized P. cepacia lipase but also could enhance the activity by varying silane additives.