State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong 250353, China.
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong 250353, China.
Int J Biol Macromol. 2020 Sep 15;159:287-294. doi: 10.1016/j.ijbiomac.2020.05.074. Epub 2020 May 13.
In this study, an alkaline-catalyzed sulfolane/water solvent system was developed for isolating high-purity and antioxidative lignin from willow (Salix matsudana cv. Zhuliu). Optimization of the pretreatment conditions such as temperature, sulfolane/water ratio, and alkaline catalyst (NaOH) dosage were comprehensively investigated for effective lignin extraction from willow. The 44.4% of lignin was recovered from the biomass with 54% of delignification in 50/50 (w/w) sulfolane/water system at 170 °C. As the addition of the alkaline catalyst (NaOH) increased to 4%, the delignification yield was increased up to 94% with about 70% of lignin recovery yield. The recovered lignin was comparatively investigated with its control, milled wood lignin (MWL). The β-O-4 linkages and phenolic hydroxyl were well preserved in the extracted lignin fractions with the sulfolane/water system. Furthermore, excellent radical scavenging ability was observed with the extracted lignins by sulfolane/water pretreatments owing to rich phenolic hydroxyl groups in the lignins. Hence, systematical investigation on the lignin properties and potential applications under sulfolane organosolv pretreatment would promote the utilization of lignin in biorefinery processes.
在这项研究中，开发了一种堿催化的环丁砜/水溶剂体系，用于从柳树（Salix matsudana cv. Zhuliu）中分离高纯度和具有抗氧化性的木质素。全面考察了预处理条件（如温度、环丁砜/水比和堿催化剂（NaOH）用量）的优化，以有效从柳树中提取木质素。在 170°C 的 50/50（w/w）环丁砜/水体系中，当堿催化剂（NaOH）的添加量增加到 4%时，木质素的得率增加到 94%，脱木质素率达到 54%。对回收的木质素及其对照品（MWL）进行了比较研究。在木质素的提取产物中，β-O-4 键和酚羟基得到了很好的保留。此外，由于木质素中含有丰富的酚羟基，通过环丁砜/水预处理提取的木质素表现出了优异的自由基清除能力。因此，对木质素在环丁砜有机溶剂预处理下的性质和潜在应用进行系统研究，将促进木质素在生物炼制过程中的利用。
