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Polyelectrolyte Coated Calcium Carbonate Microparticles as Templates for Enzyme Encapsulation

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Calcium carbonate (CaCO3) has been widely used for biomedical and pharmaceutical applications. Mesoporous CaCO3 microparticles produced by precipitation were evaluated for macromolecular encapsulation using model macromolecules like Fluorescein isothiocyanate-dextran (FITC-dextran) and Enzymes [Horse radish Peroxidase (HRP) and Glucose oxidase (GOx)]. Encapsulation efficiency of FITC-dextran (70, 150 and 500 KDa), HRP and GOx was calculated to be 64.0 (±3.1), 33.2 (±0.7), 3.9 (±0.3), 82.3 (±12.2) and 27.6 (±6.3)%, respectively. Layer-by-layer nanoengineering using polystyrene sulphonate (PSS) and polyallylamine hydrochloride (PAH) was performed on macromolecule loaded CaCO3 microparticles and the surface charge was found to alternate with each layer. Uncoated and coated microparticles were characterized by Optical microscopy, Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Confocal laser scanning microscopy (CLSM), Zeta potential and X-ray diffraction (XRD). Release of macromolecules was performed on uncoated and coated microparticles and the release of encapsulated macromolecules was found to decrease with multilayer buildup. The results demonstrate that polyelectrolyte coated CaCO3 particles can be applied as micro/nano-template towards an enzyme based biosensor.

Document Type: Research Article


Publication date: 2009-09-01

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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