Effects of pretreatment temperature and alkali concentration on the composition of alkali‐soluble lignins from wheat straw
Effects of pretreatment temperature and alkali concentration on the composition of alkali‐soluble lignins from wheat straw
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DOI：
10.1002/(sici)1097-4628(19961128)62:9
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发表时间：
1996-11
影响因子：
3
通讯作者：
R. Sun;J. Lawther;W. Banks
中科院分区：
文献类型：
--
作者：
R. Sun;J. Lawther;W. Banks
提出了一种新的快速分离麦草碱溶性木质素的方法--两步沉淀法。分离的碱溶性木质素级分LA含有相当低量的中性糖（0.7-1.0%）并且具有低平均分子量（960-1440 Da）。分离的木质素级分LA含有大致等量的愈创木基（G）和邻苯二甲酸基（S）单元以及相对较少的对羟基苯基（H）单元，并且似乎与酚酸和葡萄糖醛酸或4-O-甲基葡萄糖醛酸密切相关。报告了每个馏分中的化学组成。采用UV-、IR-、13 C-NMR-光谱和碱性硝基苯氧化法对木质素组分LA的理化性质和结构特征进行了表征。John Wiley & Sons，Inc.
A new rapid method of two step precipitation for isolation of alkali-soluble lignins with relatively free of polysaccharides from wheat straw was proposed in this study. The isolated alkali-soluble lignin fractions LA contained rather low amounts of neutral sugars (0.7–1.0%) and had low average molecular weights (960–1440 Da). The isolated lignin fractions LA contained roughly equal amounts of guaiacyl (G) and syringly (S) units with relatively fewer p-hydroxyphenyl (H) units, and appeared to be closely associated to phenolic acids and glucuronic acid or 4-O-methylglucuronic acid. The chemical compositions in each of the fractions are reported. The physico-chemical properties and structure features of these lignin fractions LA were characterized by UV-, IR-, 13C-NMR-spectroscopy, and alkaline nitrobenzene oxidation. © 1996 John Wiley & Sons, Inc.