Gelation in solutions of low deacetylated chitosan initiated by high shear stresses
| Autor: | A. A. Yusova, E.A. Indeikin, N. V. Losev, I. M. Lipatova |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Chemical Phenomena Biocompatible Materials macromolecular substances 02 engineering and technology complex mixtures Biochemistry Chitosan 03 medical and health sciences Crystallinity chemistry.chemical_compound Structural Biology Molecular Biology 030304 developmental biology 0303 health sciences Aqueous solution Rheometry Spectrum Analysis technology industry and agriculture Acetylation Hydrogels Sorption General Medicine 021001 nanoscience & nanotechnology Solutions chemistry Chemical engineering Shear (geology) Self-healing hydrogels Rheology Shear Strength 0210 nano-technology Water vapor |
| Zdroj: | International Journal of Biological Macromolecules. 139:550-557 |
| ISSN: | 0141-8130 |
| DOI: | 10.1016/j.ijbiomac.2019.07.164 |
| Popis: | A new process of mechanically initiated formation of chitosan physical hydrogels in aqueous solution, without a cross-linking agent, was studied. Physical hydrogel is formed by mechanical activation of solutions of chitosan with a low deacetylation degree (58%) in situ in a rotor-stator device for 10 s. The formation of 3D gel structure has been proven by rotational viscometry and dynamic rheometry methods. Gelation is caused by the action of high shear stresses initiating the formation of hydrophobic associates from residual chitinous blocks. In comparison with the films from untreated chitosan, the films obtained by drying hydrogel have a lower degree of crystallinity and a higher sorption capacity towards water vapor and Cu2+ ions, as well as the ability to retain up to 5000% of water during re-swelling without destruction. |
| Databáze: | OpenAIRE |
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