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Preparation and characterization of polyelectrolyte complex of N,N,N-trimethyl chitosan/gellan gum: evaluation for controlled release of ketoprofen

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Abstract

N,N,N-Trimethyl chitosan, a highly water soluble derivative of chitosan, has been made by reductive methylation of chitosan by a three-step process reported in literature. A novel polyelectrolyte complex of this derivative with gellan gum has been made by mixing the aqueous solutions of the two polymers. The complex was characterized by FTIR, TGA, DSC and SEM techniques. Maximum yield of the complex was obtained at pH 2.0 with a gellan gum:trimethylchitosan ratio of 3:1. The swelling study indicated pH responsiveness of the polyelectrolyte complex sample, with higher swelling under neutral or slightly basic conditions. In vitro studies on the release of the drug ketoprofen from the polyelectrolyte complex matrix were conducted in simulated gastric and intestinal fluids. The results indicated release of 85–90 % of the entrapped drug in the media of pH 6.8 and 7.4 and less than 7 % release in the medium of pH 1.2. The kinetic analysis indicated the drug release to be a first-order process. The mechanism of water transport and drug diffusion is shown to be of Fickian type. The results prove the suitability of the polyelectrolyte complex as a matrix material for delivery of drugs with short half life such as ketoprofen in the slow release mode.

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Authors and Affiliations

  1. Department of Post-Graduate Studies and Research in Chemistry, Mangalore University, Mangalagangothri, 574199, DK, Karnataka, India

    U. Mithun, B. Vishalakshi & J. S. Karthika

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  1. U. Mithun
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  2. B. Vishalakshi
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  3. J. S. Karthika
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Correspondence to B. Vishalakshi.

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Mithun, U., Vishalakshi, B. & Karthika, J.S. Preparation and characterization of polyelectrolyte complex of N,N,N-trimethyl chitosan/gellan gum: evaluation for controlled release of ketoprofen. Iran Polym J 25, 339–348 (2016). https://doi.org/10.1007/s13726-016-0425-9

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