Publication: An infrared investigation in relation with chitin and chitosan characterization
Authors
Brugnerotto, J. ; Lizardi, J. ; Goycoolea Valencia, Francisco Martín ; Argüelles Monal, Waldo ; Desbrières, J. ; Rinaudo, Marguerite
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Publisher
Elsevier
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DOI
https://doi.org/10.1016/S0032-3861(00)00713-8
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Description
© 2001 Elsevier Science Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Polymer. To access the final edited and published work see https://doi.org/10.1016/S0032-3861(00)00713-8
Abstract
The use of infrared spectroscopy for characterization of the composition of chitin and chitosan covering the entire range of degree of acetylation (DA) and a wide variety of raw materials is examined further. The ratio of absorbance bands selected was calibrated using 1H liquid and 13C CP-MAS solid-state NMR as absolute techniques. IR spectra of the structural units of these polymers validated the choice of baselines and characteristic bands. The bands at 1650 and 1320 cm-1 were chosen to measure the DA. As internal reference, the intensities at 3450 and 1420 cm-1 were evaluated. The absorption band ratios involving the reference at 3450 cm-1 had poorer fit. The absorption ratio A1320/A1420 shows superior agreement between the absolute and estimated DA-values (DA% = 31.92A1320/A1420 - 12.20; r = 0.990)
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Citation
Polymer, 2001, 42, 3569-3580
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