The chitosan–gelatin (bio)polyelectrolyte complexes formation in an acidic medium

•The polyelectrolyte chitosan–gelatin complexes are formed in an acidic medium.•Chitosan–gelatin complexes appear due to electrostatic interactions and hydrogen bonds.•Viscosity and particles size in the aqueous phase depend on chitosan/gelatin (w/w) ratio. The interaction of cationic polysaccharide...

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Bibliographic Details
Published in:Carbohydrate polymers 2016-03, Vol.138, p.265-272
Main Authors: Voron’ko, Nicolay G., Derkach, Svetlana R., Kuchina, Yuliya A., Sokolan, Nina I.
Format: Article
Language:English
Subjects:
(Bio)polyelectrolyte complexes
Absorption spectra
Chitosan
Chitosan - chemistry
Electrolytes - chemistry
Gelatin
Gelatin - chemistry
Hydrogen Bonding
Spectrophotometry, Ultraviolet
Spectroscopy, Fourier Transform Infrared
Viscosity
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Summary:•The polyelectrolyte chitosan–gelatin complexes are formed in an acidic medium.•Chitosan–gelatin complexes appear due to electrostatic interactions and hydrogen bonds.•Viscosity and particles size in the aqueous phase depend on chitosan/gelatin (w/w) ratio. The interaction of cationic polysaccharide chitosan and gelatin accompanied by the stoichiometric (bio)polyelectrolyte complexes formation has been studied by the methods of capillary viscometry, UV and FTIR spectroscopy and dispersion of light scattering. Complexes were formed in the aqueous phase, with pH being less than the isoelectric point of gelatin (pIgel). The particle size of the disperse phase increases along with the growth of the relative viscosity in comparison with sols of the individual components—polysaccharide and gelatin. Possible models and mechanism of (bio)polyelectrolyte complexes formation have been discussed. It was shown that the complex formation takes place not only due to the hydrogen bonds, but also due to the electrostatic interactions between the positively charged amino-groups of chitosan and negatively charged amino acid residues (glutamic Glu and aspartic Asp acids) of gelatin.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2015.11.059