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Various acetylated chitosan derivatives and mixtures of chitin and chitosan, covering the range of the degree of deacetylation (DDA) from 0-100% were analyzed by 1 H-NMR spectroscopy and infrared spectroscopy. The use of the 1070 cm -1 or 1030 cm -1 absorption band as an internal standard in the determination of DDA from the absorbance of the amide I bands at 1655...
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