Novel Method for the Determination of the Methoxyl Content in Lignin by Headspace Gas Chromatography
Novel Method for the Determination of the Methoxyl Content in Lignin by Headspace Gas Chromatography
复制标题
顶空气相色谱测定木质素中甲氧基含量的新方法
DOI：
10.1021/jf300455g
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发表时间：
2012-05-30
影响因子：
6.1
通讯作者：
Deng, Yonghong
中科院分区：
文献类型：
--
作者：
Li, Hailong;Chai, Xin-Sheng;Deng, Yonghong
建立了顶空气相色谱(HS-GC)测定木质素中甲氧基的方法。该方法包括甲氧基与氢碘酸(HI)的定量裂解，以在130℃的封闭顶空样品瓶中裂解30分钟。加入HI后，用氢氧化钠溶液中和样品，用火焰离子化检测器用HS-GC法测定小瓶中的碘甲烷。结果表明，该方法对木素中甲氧基含量的测定具有良好的测量精密度(RSD<；0.69%)和准确度(RSD<；3.5%)。本方法简便、准确，可用于木质素及相关物质中甲氧基含量的高效测定。
The paper reports on a headspace gas chromatographic (HS-GC) method for the determination of methoxyl in lignin. The method involves the quantitive cleavage of methoxyl with hydroiodic acid (HI) to form methyl iodide in a closed headspace sample vial at 130 degrees C for 30 min. After HI has been added, the sample is neutralized by injecting a sodium hydroxide solution; the methyl iodide in the vial was determined by HS-GC using a flame ionization detector. The results showed that the method has an excellent measurement precision (RSD < 0.69%) and accuracy (RSD < 3.5%) for the quantification of methoxyl content in lignin. The present method is simple and accurate and can be used for the efficient determination of methoxyl content in lignin and related materials.