Abstract
Chitin is the most productive nitrogen-containing polysaccharide in nature with immense potential for transforming into a range of chemicals. However, its dense crystal structure poses a challenge for depolymerization, limiting its applications. To overcome these challenges, a novel series of deep eutectic solvents (DESs) based on benzyltrimethylammonium chloride (TMBAC) as the hydrogen bond acceptor was developed. These TMBAC-based DESs, in combination with lactic acid, oxalic acid, and malic acid as the hydrogen bond donor demonstrated efficient chitin dissolution, achieving a solubility of up to 12% and an 88% recovery rate of regenerated chitin. The regenerated chitin was characterized using XRD, FT-IR, SEM, and 13C CP-MAS NMR, which indicated the preservation of chitin’s chemical structure, a significant decrease in crystallinity, and a reduction in the molecular weight. Furthermore, the enzymatic hydrolysis efficiency of chitin was nearly doubled after treatment with TMBAC-based DESs, surpassing the effectiveness of untreated chitin. This approach holds promise for facilitating subsequent transformation and utilization of chitin.
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Funding
This work was financially supported by Dalian Science and Technology Innovation Fund (Grant Nos. 2022JJ12SN051, 2020JJ25CY017), The Key Science and Technology Planning Project of China Tobacco Company Yunnan branch (2021530000241032), Key Laboratory of Se-enriched Products Development and Quality Control, Ministry of Agriculture and Rural Affairs/National-Local Joint Engineering Laboratory of Se-enriched Food Development (Grant No. Se-2020C02), and Natural Science Foundation Liaoning Province (Grant No. 2021-MS-018).
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Qishun Liu: conceptualization, investigation, writing—original draft preparation, funding acquisition. Jia Che: investigation, visualization. Yu Yu: investigation, visualization. Deyu Chu: investigation, visualization. Zhang Huiyan: investigation, visualization. Fuyun Zhang: writing—reviewing and editing. Miao Zhao: writing—reviewing and editing. Heng Yin: writing—reviewing and editing, funding acquisition, supervision.
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Liu, Q., Che, J., Yu, Y. et al. Dissolving Chitin by Novel Deep Eutectic Solvents for Effectively Enzymatic Hydrolysis. Appl Biochem Biotechnol (2024). https://doi.org/10.1007/s12010-024-04972-w
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DOI: https://doi.org/10.1007/s12010-024-04972-w