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An Epichlorohydrin-Crosslinked Semi-Interpenetrating GG-PEO Network as a Xerogel Matrix for Sustained Release of Sulpiride

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Abstract

The current study involved the development of a novel sustained release crosslinked semi-IPN xerogel matrix tablet prepared by chemical crosslinking of poly(ethylene) oxide (PEO) and gellan gum (GG) employing epichlorohydrin (EPI) as crosslinker. A Box–Behnken design was employed for the statistical optimization of the matrix system to ascertain the ideal combination of native polymeric and crosslinking agents. Characterization studies were performed by employing standard polymer characterization techniques such as Fourier transform infrared spectrometry, differential scanning calorimetry, and scanning electron microscopy. Formulated matrix tablets displayed zero-order release kinetics, extending over 24 h. The mechanism of drug release was primarily by swelling and surface erosion. Crosslinked semi-IPN xerogel matrix tablets were compared to non-crosslinked polymer blends; results from the study conducted showed that the physiochemical properties of the PEO and GG were sufficiently modified to allow for sustained release of sulpiride with a 100% drug release at 24 h in a controlled manner as compared to non-crosslinked formulations which displayed further release beyond the test period. Crosslinked formulations displayed water uptake between 450 and 500% indicating a controlled rate of swelling and erosion allowing for sustained release. Surface morphology of the crosslinked system depicted a porous structure formed by interpenetrating networks of polymers, allowing for a greater degree of controlled penetration into the system affording it the ability to sustain drug release. Therefore, conclusively, based on the study performed, crosslinked PEO-GG allows for the sustained release of sulpiride from a hydrophilic semi-IPN xerogel matrix system.

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Acknowledgements

This study was funded by the National Research Foundation (NRF) of South Africa.

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The Authors declare that there are no conflicts of interest.

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Correspondence to Viness Pillay.

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Hoosain, F.G., Choonara, Y.E., Kumar, P. et al. An Epichlorohydrin-Crosslinked Semi-Interpenetrating GG-PEO Network as a Xerogel Matrix for Sustained Release of Sulpiride. AAPS PharmSciTech 15, 1292–1306 (2014). https://doi.org/10.1208/s12249-014-0153-4

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