Abstract
The aim of this study was to investigate the effect of altering design variables like cross-linking and freezing temperature (at a time) on morphology of freeze-dried chitosan scaffolds and modulation of release of Diclofenac sodium (model drug). Freeze-dried chitosan scaffolds produced at − 80 °C, cross-linked with genipin, showed swelling of 163.52 ± 9.95% with sustained drug release of 26.37 ± 10.47% over 24 h (P < 0.05). In comparison, uncross-linked scaffolds produced at − 80 °C showed higher swelling of 173.58 ± 8.23% and drug release of 28.67 ± 2.40% (P < 0.05). Uncross-linked scaffolds produced using freezing temperature of − 20 °C also showed higher swelling of 228.77 ± 9.84% and release of 30.58 ± 3.25% (P < 0.05). Release kinetics followed Higuchi model with Fickian diffusion, thereby indicating a swelling-dependent release. Altering the design parameters also showed significant changes in pore size and porosity, thereby supporting the swelling and drug delivery behavior from scaffolds.
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Acknowledgements
The authors sincerely acknowledge Mr. Shivanand. M. Shettigar, Manipal College of Pharmaceutical Sciences, Manipal for technical support.
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This work was supported by Manipal University under the Grant MIT/AD-R&C/Post Doc/2012, dated 30.11.2012.
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Dathathri, E., Thakur, G., Koteshwara, K.B. et al. Investigating the effect of freezing temperature and cross-linking on modulating drug release from chitosan scaffolds. Chem. Pap. 74, 1759–1768 (2020). https://doi.org/10.1007/s11696-019-01024-0
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DOI: https://doi.org/10.1007/s11696-019-01024-0