Abstract
pH-Responsive chitosan-modified calcium alginate microspheres with an average diameter of 2.0 ± 0.05 mm for immobilization of antibiotic cefotaxime are obtained by the ionotropic gelation technique. The efficiency of cefotaxime encapsulation is 95–97%. The formation of polyelectrolyte complex alginate-chitosan in media with different pH values is studied by conductometry and dynamic light scattering. It is shown that the swelling of microspheres and the release of cefotaxime under in vitro conditions in media simulating biological fluids in the human body at peroral delivery are pH-dependent processes. Analysis of the kinetic data on the swelling of microspheres and the release of drug within the framework of the Korsmeyer-Peppas mathematical model demonstrates that the diffusion mechanism deviates from the classical Fick mechanism. This finding can probably be explained by interaction of the drug with the polymer matrix. It is found that presence of the surface chitosan layer on calcium alginate microspheres makes it possible to increase the release time of cefotaxime.
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This work was carried out using equipment of the Shared Research Center Nanotechnologies and Nanomaterials, Kazan National Research Technological University.
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Shilova, S.V., Mirgaleev, G.M. & Barabanov, V.P. pH-Responsive Calcium Alginate Microspheres Modified with Chitosan for Immobilization of Antibiotic Cefotaxime. Polym. Sci. Ser. A 64, 447–455 (2022). https://doi.org/10.1134/S0965545X22700171
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DOI: https://doi.org/10.1134/S0965545X22700171