Novel Method for the Determination of the Methoxyl Content in Lignin by Headspace Gas Chromatography

被引：59
|
作者：
Li, Hailong [1 ]
Chai, Xin-Sheng [1 ]
Liu, Mengru [2 ]
Deng, Yonghong [3 ]
机构：
[1] S China Univ Technol, State Key Lab Pulp & Paper Engn, Guangzhou 510640, Guangdong, Peoples R China
[2] S China Univ Technol, Ind Technol Res Inst, Guangzhou 510640, Guangdong, Peoples R China
[3] S China Univ Technol, Sch Chem & Chem Engn, Guangzhou 510640, Guangdong, Peoples R China
来源：
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY | 2012年 / 60卷 / 21期
基金：
高等学校博士学科点专项科研基金;
关键词：
methoxyl; lignin; headspace; gas chromatography; hydroiodic acid; OXYGEN; ALKALI;
D O I：
10.1021/jf300455g
中图分类号：
S [农业科学];
学科分类号：
09 ;
摘要：
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.
引用
收藏
页码：5307 / 5310
页数：4
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