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 H2O; 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 H2O 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.
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ASJC Scopus subject areas
- Chemistry (all)