Chitosan-PEG hydrogel with sol-gel transition triggerable by multiple external stimuli.

Autor: Tsao CT; Department of Materials Science & Engineering, University of Washington, Seattle, WA, 98195, USA., Hsiao MH, Zhang MY, Levengood SL, Zhang M
Jazyk: angličtina
Zdroj: Macromolecular rapid communications [Macromol Rapid Commun] 2015 Feb; Vol. 36 (3), pp. 332-8. Date of Electronic Publication: 2014 Dec 17.
DOI: 10.1002/marc.201400586
Abstrakt: Smart hydrogels play an increasingly important role in biomedical applications, since materials that are both biocompatible and multi-stimuli-responsive are highly desirable. A simple, organic solvent-free method is presented to synthesize a biocompatible hydrogel that undergoes a sol-gel transition in response to multiple stimuli. Methoxy-poly(ethylene glycol) (mPEG) is modified into carboxylic-acid-terminated-methoxy-poly(ethylene glycol) (mPEG-acid), which is then grafted onto chitosan via amide linkages yielding mPEG-g-chitosan. Grafting of mPEG onto hydrophobic chitosan imparts hydrophilic properties to the resultant polymer. The mPEG-g-chitosan gel exhibits a controllable multi-stimuli-responsive property. The balance between hydrophilicity and hydrophobicity is believed to confer mPEG-g-chitosan with stimuli-responsive behavior. The effect of salt concentration, solute concentration, temperature, and pH on the sol-gel transition of mPEG-g-chitosan is evaluated and the underlying mechanisms of mPEG-g-chitosan polymer packing and gelation property is discussed.
(© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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