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Dissolving and Efficient Fractionation of Chitin and Synchronous Preparation of Calcium Lactate from Crayfish Shell Waste Using Amino Acid-Based Deep Eutectic Solvents
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2024-01-18 , DOI: 10.1021/acssuschemeng.3c06594 Long Zhang 1 , Jiake Wang 1 , Boxiang Zhan 1 , Yongqi Deng 1 , Lifeng Yan 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2024-01-18 , DOI: 10.1021/acssuschemeng.3c06594 Long Zhang 1 , Jiake Wang 1 , Boxiang Zhan 1 , Yongqi Deng 1 , Lifeng Yan 1
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Chitin is a natural biomass material with wide sources and high application potential, but the solvents for dissolving chitin are very limited. In this work, ternary alkaline deep eutectic solvents (DESs) containing amino acids, urea, and 1,8-diazabicyclo [5.4.0] undec-7-ene (DBU) were prepared, which can successfully achieve the dissolution of chitin and can be recycled. By adjusting the type of amino acids and the amount of DBU, the maximum solubility of chitin can reach 6.0 wt %. In addition, unlike the reported acidic DES system, this new ternary alkaline DES not only efficiently extracted chitin from crayfish shell waste but also efficiently prepared calcium lactate (CL), which successfully realized the effective recycling of calcium resources. Through 11 sets of extraction conditions, proteins in the crayfish shell were effectively removed, and the yields of chitin and CL remained above 85 and 90%, respectively. Finally, chitin nanofibers were successfully prepared by ultrasonic treatment with extracted regenerated chitin. Further processing of the chitin nanofibers can yield chitin films with high transparency and high tensile strength (63.2 MPa). It provides a novel DES system to dissolve chitin and an environmentally friendly utilization strategy to efficiently extract chitin and prepare CL from crayfish shell waste, thereby producing high-performance functional materials.
中文翻译：
氨基酸低共熔溶剂从小龙虾壳废弃物中溶解高效分离甲壳素并同步制备乳酸钙
甲壳素是一种来源广泛、应用潜力较大的天然生物质材料，但溶解甲壳素的溶剂非常有限。本工作制备了含有氨基酸、尿素和1,8-二氮杂双环[5.4.0]十一碳7-烯（DBU）的三元碱性低共熔溶剂（DES），成功实现了甲壳素的溶解，并可被回收。通过调整氨基酸的种类和DBU的量，甲壳素的最大溶解度可以达到6.0wt%。此外，与报道的酸性DES系统不同，这种新型三元碱性DES不仅可以从小龙虾壳废物中高效提取甲壳素，还可以高效制备乳酸钙（CL），成功实现了钙资源的有效循环利用。通过11组提取条件，有效去除了小龙虾壳中的蛋白质，甲壳素和CL的得率分别保持在85%和90%以上。最后，利用提取的再生甲壳素，通过超声波处理成功制备了甲壳素纳米纤维。甲壳素纳米纤维的进一步加工可以产生具有高透明度和高拉伸强度（63.2 MPa）的甲壳素薄膜。它提供了一种新型的溶解甲壳素的DES系统和一种环保的利用策略，可以从小龙虾壳废物中高效提取甲壳素并制备CL，从而生产高性能的功能材料。
更新日期：2024-01-18
中文翻译：
氨基酸低共熔溶剂从小龙虾壳废弃物中溶解高效分离甲壳素并同步制备乳酸钙
甲壳素是一种来源广泛、应用潜力较大的天然生物质材料，但溶解甲壳素的溶剂非常有限。本工作制备了含有氨基酸、尿素和1,8-二氮杂双环[5.4.0]十一碳7-烯（DBU）的三元碱性低共熔溶剂（DES），成功实现了甲壳素的溶解，并可被回收。通过调整氨基酸的种类和DBU的量，甲壳素的最大溶解度可以达到6.0wt%。此外，与报道的酸性DES系统不同，这种新型三元碱性DES不仅可以从小龙虾壳废物中高效提取甲壳素，还可以高效制备乳酸钙（CL），成功实现了钙资源的有效循环利用。通过11组提取条件，有效去除了小龙虾壳中的蛋白质，甲壳素和CL的得率分别保持在85%和90%以上。最后，利用提取的再生甲壳素，通过超声波处理成功制备了甲壳素纳米纤维。甲壳素纳米纤维的进一步加工可以产生具有高透明度和高拉伸强度（63.2 MPa）的甲壳素薄膜。它提供了一种新型的溶解甲壳素的DES系统和一种环保的利用策略，可以从小龙虾壳废物中高效提取甲壳素并制备CL，从而生产高性能的功能材料。
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