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Fabrication of porous FePt microcapsules for immunosensing techniques.
Colloids and Surfaces. B, Biointerfaces 2018 October 4
Porous FePt microcapsules are fabricated for use in bead-based immunoassay technologies, that generally use magnetic spheres to immobilize biomolecules on their surface. The magnetic capsules can be used to carry assay reagents to reduce the time required to perform immunoassay processes, and microsize capsules are easier to manipulate magnetically than nanosize ones. Silica particles of approximately 2.5 μm diameter are used as templates and modified with poly(ethyleneimine) (PEI), which enables FePt nanoparticles to accumulate selectively on the template particles and an FePt shell to be formed by a polyol process. To increase the mechanical stability of the FePt nanoparticle assembly shell, a double-layered FePt nanoparticle assembly is fabricated by repeating the modification process of PEI and the synthesis process of FePt nanoparticles, resulting in the fabrication of magnetic capsules with a three-dimensional structure. We further investigate the ability of magnetic capsules to immobilize antibodies on their surface. Gold nanoparticles are used as linkers between the magnetic microcapsules and antibodies. The antibodies are successfully immobilized on the surface of the developed microsize FePt capsules.
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