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Molecules 2017, 22(11), 1976;

Development of Gallic Acid-Modified Hydrogels Using Interpenetrating Chitosan Network and Evaluation of Their Antioxidant Activity

Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero, Yuseong-gu, Daejeon 34057, Korea
Department of Chemistry, Chosun University, Gwangju 61452, Korea
Department of Natural Sciences, Caraga State University, Butuan City 8600, Philippines
Department of Chemistry, Dankook University, 119, Dandae-ro, Chungnam 31116, Korea
Department of Biomedical Engineering, School of Medicine, Catholic University of Daegu, Daegu 42472, Korea
These authors equally contributed to this work.
Authors to whom correspondence should be addressed.
Received: 14 October 2017 / Revised: 4 November 2017 / Accepted: 13 November 2017 / Published: 15 November 2017
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In this work, antioxidant hydrogels were prepared by the construction of an interpenetrating chitosan network and functionalization with gallic acid. The poly(2-hydroxyethyl methacrylate) p(HEMA)-based hydrogels were first synthesized and subsequently surface-modified with an interpenetrating polymer network (IPN) structure prepared with methacrylamide chitosan via free radical polymerization. The resulting chitosan-IPN hydrogels were surface-functionalized with gallic acid through an amide coupling reaction, which afforded the antioxidant hydrogels. Notably, gallic-acid-modified hydrogels based on a longer chitosan backbone exhibited superior antioxidant activity than their counterpart with a shorter chitosan moiety; this correlated to the amount of gallic acid attached to the chitosan backbone. Moreover, the surface contact angles of the chitosan-modified hydrogels decreased, indicating that surface functionalization of the hydrogels with chitosan-IPN increased the wettability because of the presence of the hydrophilic chitosan network chain. Our study indicates that chitosan-IPN hydrogels may facilitate the development of applications in biomedical devices and ophthalmic materials. View Full-Text
Keywords: chitosan; IPN; hydrogels; antioxidant activity; gallic acid chitosan; IPN; hydrogels; antioxidant activity; gallic acid

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Kang, B.; Vales, T.P.; Cho, B.-K.; Kim, J.-K.; Kim, H.-J. Development of Gallic Acid-Modified Hydrogels Using Interpenetrating Chitosan Network and Evaluation of Their Antioxidant Activity. Molecules 2017, 22, 1976.

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