Abstract
Based on the method of the layer-by-layer (LbL) adsorption of oppositely charged polyelectrolytes, sodium alginate (Alg) and poly-L-lysine (PLL), novel biodegradable microcapsules have been prepared for delivery of biological active substances (BAS). Porous spherical CaCO3 microparticles were used as templates. The template cores were coated with several layers of oppositely charged polyelectrolytes forming shell on the core surface. The core-shell microparticles were converted into hollow microcapsules by means of core dissolution with EDTA. Mild conditions for microcapsules preparation allow to perform incorporation of various biomolecules maintaining their bioactivity. Biocompatibility and biodegradability of the polyelectrolytes give a possibility to use the microcapsules as the target delivery systems. Chymotrypsin entrapped into the microcapsules was used as a model enzyme. The immobilized enzyme retained about 86% of the activity compared to a native chymotrypsin. The resultant microcapsules were stable in acidic medium and could be easily decomposed by trypsin treatment in slightly alkaline medium. Chymotrypsin was shown to be active after its release from the microcapsules decomposed by the trypsin treatment. Thus, the microcapsules prepared by the LbL technique can be used for the development of new type of BAS delivery systems in humans and animals.
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Original Russian Text © T.N. Borodina, L.D. Rumsh, S.M. Kunizhev, G.B. Sukhorukov, G.N. Vorozhtsov, B.M. Feldman, E.A. Markvicheva, 2008, published in Biomeditsinskaya Khimiya.
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Borodina, T.N., Rumsh, L.D., Kunizhev, S.M. et al. Polyelectrolyte microcapsules as the systems for delivery of biologically active substances. Biochem. Moscow Suppl. Ser. B 2, 88–93 (2008). https://doi.org/10.1007/s11828-008-1010-3
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DOI: https://doi.org/10.1007/s11828-008-1010-3