LIGNIN AND LIGNIN-CARBOHYDRATE COMPLEXES - EXTRACTION FROM WOOD MEAL WITH NEUTRAL SOLVENTS
LIGNIN AND LIGNIN-CARBOHYDRATE COMPLEXES - EXTRACTION FROM WOOD MEAL WITH NEUTRAL SOLVENTS
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DOI：
10.1021/ie50573a040
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发表时间：
1957-01-01
影响因子：
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通讯作者：
BJORKMAN, A
中科院分区：
文献类型：
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作者：
BJORKMAN, A
也许木质素最令人烦恼的特征是难以分离而不发生严重变化。采用多种方法可以从同一木材中得到一组不同的木质素。某些类型可溶于冷的中性溶剂，但相同的溶剂仅从普通木粉中溶解少量木质素材料，该木质素材料18年来一直被称为Brauns的天然木质素（BNL）（6）。从木材中提取木质素的困难有三种可能的解释：第一，木质素与碳水化合物之间存在强共价键;第二，木质素具有高分子量并可能形成三维网络;第三，氢键和物理现象如固溶体可能参与木质素在木材纤维壁中的保留。
Perhaps the most annoying feature of lignin has been the difficulty in iso-lation without severe change. By ap-plying several methods, a set of different lignins can be obtained from one piece of wood. Certain types are soluble in cold neutral solvents but the same sol-vents dissolve from common wood meal only a small amount of lignin material which has been known for 18 years (6) as Brauns’ native lignin (BNL). There are three conceivable explanations for the difficulty in extracting lignin from wood—first, strong covalent bonds exist between lignin and carbohydrates; second, lignin has a high molecular weight and possibly forms a three-di-mensional network; and third, hydrogen bonds and physical phenomena such as solid solution may be involved in retention of lignin in the wood-fiber wall.