Pretreatment of willow using the alkaline-catalyzed sulfolane/water solution for high-purity and antioxidative lignin production
Pretreatment of willow using the alkaline-catalyzed sulfolane/water solution for high-purity and antioxidative lignin production
复制标题
使用碱催化环丁砜/水溶液预处理柳树以生产高纯度和抗氧化木质素
DOI：
10.1016/j.ijbiomac.2020.05.074
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发表时间：
2020
影响因子：
8.2
通讯作者：
Feng Xu
中科院分区：
文献类型：
--
作者：
Lei Zhong;Miaomiao Xu;Chao Wang;Lupeng Shao;Jianzhen Mao;Weikun Jiang;Xingxiang Ji;Guihua Yang;Jiachuan Chen;Gaojin Lyu;Chang Geun Yoo;Feng Xu
为了从柳树中分离出高纯度的抗氧化性木质素，开发了一种碱催化环丁砜/水溶剂体系。诸柳)。综合考察了温度、环丁砜/水比、碱性催化剂(NaOH)用量等预处理条件对杨柳木质素提取效果的影响。在温度170℃、温度为50/50(w/w)的环丁砜/水体系中，生物质脱木素回收率为44.4%，脱木素回收率为54%。当碱性催化剂(NaOH)的加入量增加到4%时，脱木素收率提高到94%，木质素回收率约为70%。对回收的木质素与其对照磨木素进行了对比研究。用环丁砜/水体系提取的木素组分中，β-O-4键和酚羟基被保存得很好。此外，由于木质素中含有丰富的酚羟基，因此经环丁硫烷/水处理后的木质素具有良好的清除自由基的能力。因此，系统研究环丁硫烷有机溶剂预处理条件下木质素的性质及其潜在应用，将促进木质素在生物精炼过程中的利用。
In this study, an alkaline-catalyzed sulfolane/water solvent system was developed for isolating high-purity and antioxidative lignin from willow (Salix matsudanacv. 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.