Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 117, Issue -, Pages 707-712Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2013.09.044
Keywords
Polymers; Thin films; Coatings; FT-IR
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Films based on fish gelatin, chitosan and blend of fish gelatin and chitosan before and after cross-linking with EDC have been characterized by FT-IR spectroscopy. The FT-IR spectrum of fish gelatin film showed the characteristic amide I, amide II and amide III bands, and the FT-IR spectrum of chitosan film confirmed that the polymer was only a partially deacetylated product, and included CH3-C=O and NH2 groups, the latter both in their free -NH2 and protonated -NH3+; form. Analysis of FT-IR spectra of two-component, fish gelatin-chitosan film revealed the formation not only of hydrogen bonds within and between chains of polymers, but also of electrostatic interactions between -COO- of gelatin and -NH3+ of chitosan. Modification with EDC provided cross-linking of composites of the film. New iso-peptide bonds formed between activated carboxylic acid groups of glutamic or aspartic acid residue of gelatin and amine groups of gelatin or/and chitosan. (C) 2013 Elsevier B.V. All rights reserved.
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