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Solid-state 1H CP/MAS NMR spectra of chitosan gels II in the presence of AcOH cofactor, with structure model including signal numbering. (a) The swollen gel itself, (b) the gel treated with 5 mM of (-)-L-DBTA and (c) the gel treated with 5 mM of (+)-D-DBTA. Copyright Wiley-VCH Verlag GmbH & Co. [70].
