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Hydrogel Network Formation Revised: High-Resolution Magic Angle Spinning Nuclear Magnetic Resonance as a Powerful Tool for Measuring Absolute Hydrogel Cross-Link Efficiencies

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Abstract:

In the present work, high-resolution magic angle spinning (hr-MAS) NMR spectroscopy is applied as a straightforward nondestructive technique to quantify unreacted methacrylamide functionalities in cross-linked gelatin hydrogels. By adjusting several cross-linking parameters including the ultraviolet (UV) irradiation time and the photo-initiator concentration, the cross-linking degree can be easily varied. Remarkably, under all experimental conditions typically applied for hydrogel development, no more than 40% of the methacrylamide moieties present have reacted. The hr-MAS based approach to determine the cross-linking efficiency is shown to provide an innovative and more convenient alternative to the well-established classical techniques. In addition, the results obtained are in good correlation with mechanical analysis data.

Keywords: CROSS-LINKING EFFICIENCY; GELATIN; HIGH-RESOLUTION MAGIC ANGLE SPINNING NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; HR-MAS NMR; NMR

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370210792973550

Affiliations: 1: Polymer Chemistry and Biomaterials Research Group, Department of Organic Chemistry, Ghent University, Krijgslaan 281 (building S4), B-9000 Ghent, Belgium 2: NMR and Structure Analysis Unit, Department of Organic Chemistry, Ghent University, Krijgslaan 281 (Building S4), B-9000 Ghent, Belgium

Publication date: October 1, 2010

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