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Preparing Xanthan‐Chitosan Composites in Glycerol
Author(s) -
Bilanovic Dragoljub,
Iliassafov Lubov,
Kurzbaum Eyal,
Armon Robert
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201803368
Subject(s) - chitosan , cationic polymerization , xanthan gum , absorption of water , covalent bond , polysaccharide , glycerol , maillard reaction , chemistry , absorption (acoustics) , chemical engineering , polymer chemistry , materials science , porosity , nuclear chemistry , composite material , organic chemistry , rheology , engineering
Anionic xanthan (X) and cationic chitosan (C) form xanthan‐chitosan (X + C) complexes by electrostatic attraction in an aquatic environment where concentration of either of the polysaccharides does not exceed 2.5 wt %. Covalently bonded xanthan‐chitosan (X−C) composites were prepared in dry glycerol with concentration of either of the polysaccharides in the range 0.025 to 50% weight. In dry glycerol xanthan and chitosan formed covalent bonds via condensation reactions. Carboxyl groups donate OH − while amino groups donate H + to make H 2 O; water is also condensed in Maillard reactions during crosslinking of both xanthan and chitosan with glycerol. X−C composites were made at xanthan to chitosan ratio in range 0.08 to 26. Porosity of X−C composites decreased with increasing xanthan content and decreasing chitosan content. X−C composites prepared at various xanthan to chitosan ratio showed different H 2 O absorption, hardness, release and absorption of chemicals, and they differed in other characteristics as well. These results are significant for scientific community, food, material, pharmaceutical, and other fields.