Dr. S.S. Bhatnagar University Institute of Chemical Engineering, Panjab University, Chandigarh, 160014, India.
Dr. S.S. Bhatnagar University Institute of Chemical Engineering, Panjab University, Chandigarh, 160014, India.
Int J Biol Macromol. 2017 Apr;97:403-410. doi: 10.1016/j.ijbiomac.2017.01.057. Epub 2017 Jan 16.
In this work lignin was extracted from waste jute bags using soda cooking method and effect of varying alkali concentration and pH on yield, purity, structure and thermal degradation of lignin were studied. The Lignin yield, chemical composition and purity were assessed using TAPPI method and UV-vis spectroscopy. Yield and purity of lignin ranged from 27 to 58% and 50-94%, respectively for all the samples and was maximum for 8% alkali concentration and at pH 2 giving higher thermal stability. Chemical structure, thermal stability and elementary analysis of lignin were studied using FTIR, NMR, thermo gravimetric analysis (TGA) and Elemental analyzer. FTIR and NMR results showed that core structure of lignin starts breaking beyond 10% alkali concentration. S/G ratio shows the dominance of Syringyl unit over guaiacyl unit.
在这项工作中，采用苏打蒸煮法从废黄麻袋中提取木质素，并研究了不同碱浓度和 pH 值对木质素产率、纯度、结构和热降解的影响。木质素的得率、化学成分和纯度采用 TAPPI 法和紫外可见光谱法进行评估。所有样品的木质素得率和纯度范围分别为 27-58%和 50-94%，在 8%碱浓度和 pH 值为 2 时达到最大值，具有更高的热稳定性。采用傅里叶变换红外光谱（FTIR）、核磁共振（NMR）、热重分析（TGA）和元素分析对木质素的化学结构、热稳定性和元素分析进行了研究。FTIR 和 NMR 结果表明，木质素的核心结构在超过 10%的碱浓度下开始破裂。S/G 比表明，丁香基单元比愈创木基单元占优势。
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