Chemical gels are obtained by reacting chitosan with 1,1,3,3-tetramethoxypropane (TMP, a "masked" dialdehyde) and then reducing the polymeric Schiff-base networks with an excess of cyanoborohydride (NaBH3CN). The gels have been characterized by means of three different C-13 magic angle spinning NMR techniques: cross-polarization, cross-polarization with a simultaneous phase inversion and single pulse excitation. In this way we obtained spectra containing sufficiently resolved information for structural analysis. A quantitative evaluation of the cross-linking degree of chitosan-TMP networks is thus attainable. (C) 2001 Elsevier Science Ltd. All rights reserved.
NMR study of a novel chitosan-based hydrogel / D., Capitani; A. A., De Angelis; Crescenzi, Vittorio; Masci, Giancarlo; A. L., Segre. - In: CARBOHYDRATE POLYMERS. - ISSN 0144-8617. - 45:3(2001), pp. 245-252. [10.1016/s0144-8617(00)00255-1]
NMR study of a novel chitosan-based hydrogel
CRESCENZI, Vittorio;MASCI, Giancarlo;
2001
Abstract
Chemical gels are obtained by reacting chitosan with 1,1,3,3-tetramethoxypropane (TMP, a "masked" dialdehyde) and then reducing the polymeric Schiff-base networks with an excess of cyanoborohydride (NaBH3CN). The gels have been characterized by means of three different C-13 magic angle spinning NMR techniques: cross-polarization, cross-polarization with a simultaneous phase inversion and single pulse excitation. In this way we obtained spectra containing sufficiently resolved information for structural analysis. A quantitative evaluation of the cross-linking degree of chitosan-TMP networks is thus attainable. (C) 2001 Elsevier Science Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
