Chitin characterization by SEM, FTIR, XRD, and 13C cross polarization/mass angle spinning NMR

By G. Cardenas, G. Cabrera, E. Taboada, S. Miranda. 2004

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Application of Spectroscopic Methods for Structural Analysis of Chitin and Chitosan (2010, background): “The sets of (13)C chemical shifts for chitin samples isolated from different sources were found elsewhere [53].”
Investigation on thermo-mechanical characteristics of treated/untreated Portunus sanguinolentus shell powder-based jute fabrics reinforced epoxy composites (2020, background): “From the spectrograms, the first small ‘U’ bend at 3253 cm and 3248 cm denotes the regions of OH and NH, which attributes the presence of -Chitin for the untreated and treated Portunus sanguinolentus shell powder [22].”
Dissolution Behavior of Chitin in Ionic Liquids (2010, background): “The absorption bands at 3268 and 3106 cm−1 are assigned to the intermolecular hydrogen bond C O · · · · · · H–N and the intramolecularly bonded NH groups, respectively.[16,45] In the curves b to e, the absorption bands at 3268 and 3106 cm−1 were weakened or vanished, and the split amide I absorption”