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• W2124480614 abstract "ABSTRACT Carboxymethyl chitosan, a water soluble chitosan derivative, was prepared from chitosan using monochloroacetic acid. Carboxymethyl chitosan/cellulose acetate microspheres (CCM) were prepared using the method of W/O/W and emulsification solvent evaporation as drug delivery system. The CCMs prepared were spherical, free‐flowing, and nonaggregated with the smooth appearance and many small pores on the surface. All CCMs prepared had sustained release efficiency for acetaminophen and the optimal formulation was that carboxymethyl chitosan of 2.0% and 1360 KD. In addition, the release rate of drug from CCMs in dilute hydrochloric acid was much slower than that in phosphate buffer saline (pH 6.8) during 24 h. It is illustrated that the drug loaded in CCMs released slower in simulated gastric fluid than that in simulated intestinal fluid. Furthermore, the drug release data showed better fitness with the first order model which indicated that the drug release from CCMs was depended on the drug concentration in the polymeric networks. And the release of drug from CCMs indicated diffusion‐controlled drug release based on Fickian diffusion and accompanied with anomalous transport (i.e., non‐Fickian diffusion) according to the values obtained from Higuchi model and Peppas models. So it was shown that the CCMs might be an ideal sustained release system for acid‐labile drugs both for the solubility of carboxymethyl chitosan and the release media. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42152." @default.
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• W2124480614 date "2015-03-21" @default.
• W2124480614 modified "2023-10-10" @default.
• W2124480614 title "Preparation and release kinetics of carboxymethyl chitosan/cellulose acetate microspheres as drug delivery system" @default.
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• W2124480614 doi "https://doi.org/10.1002/app.42152" @default.
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