Versatile pectin grafted poly (N-isopropylacrylamide); modulated targeted drug release

Assaf, S. M., Abul-Haija, Y. M. and Fares, M. M. (2011) Versatile pectin grafted poly (N-isopropylacrylamide); modulated targeted drug release. Journal of Macromolecular Science, Part A, 48(6), pp. 493-502. (doi: 10.1080/10601325.2011.573374)

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This study describes synthesis and optimization of pectin grafted poly(N-isopropylacrylamide) hydrogels as vehicles for colon-targeted theophylline model drug release. The gels were prepared in the presence of N, N′–methylenebisacrylamide (MBAA) crosslinker and ceric ammonium nitrate (CAN) initiator under N2 atmosphere. Optimum conditions, in terms of percent of grafting (%G), were determined as follows: pectin = 1.0 g, [NIPAAm] = 26.51 mM, [MBAA] = 0.65 mM, [CAN] = 0.073 mM, polymerization temperature = 30°C and time = 4.0 h. Hydrogels were characterized by FTIR, TGA, DSC, XRD and SEM. The formed hydrogel did not have a thermo-sensitivity behavior. The in vitro percent drug release was studied in terms of different percent of grafting and different polymerization temperatures under two pH values namely 5.5 and 7.4. Conclusively, the optimum colon-targeted vehicle properties that provide the least drug release at pH5.5 and the most drug release at pH7.4 were as follows: [NIPAAm] = 26.51 mM and [MBAA] = 0.56 mM, polymerization temperature = 30°C and %G = 55.5.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Abul-Haija, Yousef
Authors: Assaf, S. M., Abul-Haija, Y. M., and Fares, M. M.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Journal of Macromolecular Science, Part A
Publisher:Taylor & Francis
ISSN (Online):1520-5738
Published Online:08 May 2011

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