Biorefinery Processes Research Group, Chemical & Environmental Engineering Department, Faculty of Engineering of Gipuzkoa, University of the Basque Country UPV/EHU, Plaza Europa 1, 20018 Donostia, Spain.
Biorefinery Processes Research Group, Chemical & Environmental Engineering Department, Faculty of Engineering of Gipuzkoa, University of the Basque Country UPV/EHU, Plaza Europa 1, 20018 Donostia, Spain.
Int J Biol Macromol. 2020 Jul 15;155:447-455. doi: 10.1016/j.ijbiomac.2020.03.162. Epub 2020 Mar 18.
In this work, an effective sequential organic solvent extraction of kraft and organosolv lignins was carried out to separate lignin into more homogeneous fractions with specific properties. The selected solvents were ethyl acetate, ethanol, methanol, and acetone in that order. Fractions were analysed in terms of their yield, molecular weight, S/G ratio, and phenolic hydroxyl groups content. The incorporation of lignin fractions into the chitosan was aimed to increase the UV absorbance and the mechanical resistance of the chitosan films, which would provide good properties for applications in the packaging field. Films were analysed in terms of UV-vis absorption spectra, tensile strength, as well as colour changes. Results showed a significant increase in the absorbance of UV-A and UV-B with the addition of lignin fractions, mechanical properties showed an increase in the ultimate tensile strength in case of kraft fractions, while organosolv fractions do not affect tensile strength significantly.
在这项工作中，采用有效的顺序有机溶剂萃取法从牛皮纸浆和有机溶剂法制浆木质素中分离出具有特定性质的更均一木质素级分。所选溶剂的顺序为乙酸乙酯、乙醇、甲醇和丙酮。根据产率、分子量、S/G 比和酚羟基含量对级分进行分析。将木质素级分掺入壳聚糖中旨在提高壳聚糖膜的紫外吸收和机械强度，这将为包装领域的应用提供良好的性能。从紫外-可见吸收光谱、拉伸强度以及颜色变化等方面对薄膜进行了分析。结果表明，添加木质素级分后，UV-A 和 UV-B 的吸收率显著增加，在牛皮纸浆级分的情况下，力学性能表现为极限拉伸强度增加，而有机溶剂法制浆级分对拉伸强度没有显著影响。
