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Study on the dissolution and recovery mechanism of bacterial cellulose by green ionic liquid designed based on
Yue Lv1, Wenqiang Jia1, Hongda Cai1
1Key Laboratory of Forest Plant Ecology, Northeast Forestry University, Ministry of Education, Harbin 150040, Heilongjiang, China; College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin 150040, Heilongjiang, China.
Abstract:
Bacterial cellulose (BC) is a natural polysaccharide polymer synthesized by microorganisms via fermentation. However, its complex three-dimensional network structure results in poor solubility, and traditional solvents, being toxic and energy intensive, limit its industrial application. In this study, 792 ionic liquids (ILs) were screened by Conductor-like screening model for realistic solvents (COSMO-RS) to predict BC solubility. Experimental validation revealed that 1,5-diazabicyclo[4.3.0]non-5-ene carboxylates ([DBN][AC]) achieved efficient dissolution of BC (DP = 9217) at a concentration of 6%. Combined with theoretical calculation and analysis, the molecular mechanism by which ILs disrupt the hydrogen bond network of BC was revealed. Regeneration experiments confirmed that the recovery rate of [DBN][AC] was as high as 93.8%. This study not only verified the reliability of the COSMO-RS model in guiding green solvent design, but also provides potential for the modified BC in future applications in the fields of active food packaging and as bioactive carriers.
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