Role of salt ions and molecular weights on the formation of Mesona chinensis polysaccharide-chitosan polyelectrolyte complex hydrogel
2020
Yang, Jun | Shen, Mingyue | Wu, Ding | Luo, Yu | Li, Mingyu | Wen, Huiliang | Xie, Jianhua
The effects of the addition of salt ions and molecular weights (Mw) of CH on Mesona chinensis polysaccharide (MCP)-chitosan (CH) hydrogel were investigated. Result indicated both low concentration of monovalent salt ions (Na⁺ and K⁺), divalent cations (Ca²⁺) and oxoanions (SO₄²⁻) could promote the gel properties of MCP-CH hydrogel. The Mw of CH has huge impact on the formation and properties of hydrogel. Combining the relationship between rheology and structural, monovalent salt ions such as Na⁺ and K⁺ affect gel formation and its properties by influencing electrostatic interaction and chain conformation. Both divalent cations (Ca²⁺) and oxoanions (SO₄²⁻) facilitated the formation of gel networks via electrostatic interaction, coordination bonds and hydrogen bonds. Moreover, Mw of CH influenced formation and texture of MCP-CH hydrogel via affecting the conformation of CH molecular chain. These findings will provide a few theoretical bases to understand the formation mechanism of MCP-CH hydrogel.
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