Micron-sized monodispersed stimuli-responsive polys’ (PS)/poly(2-dimethylaminoethyl methacrylate-N-isopropyl acrylamide-ethylene glycol dimethacrylate) [P(DM-NIPAM-EGDM)] composite polymer particles were prepared by seeded copolymerisation of DM, NIPAM and EGDM with PS seed particles. Adsorption behaviour of trypsin suggested that composite particles surface has both temperature- and pH-responsive swelling–deswelling characteristics. The performance of composite polymer particles as a carrier for biomolecules in adsorption/release experiments was evaluated by measuring the specific activities of adsorbed trypsin as a function of temperature and pH.