title: Rapid method for determination of carbonyl groups in lignin compounds by headspace gas chromatography.
abstract: The paper reports on a novel method for rapid determination of carbonyl in lignins by headspace gas chromatography (HS-GC). The method involves the quantitative carbonyl reduction for aldehydes in 2min at room temperature or for acetones in 30min at 80°C by sodium borohydride solution in a closed headspace sample vial. After the reaction, the solution was acidified by injecting sulfuric acid solution and the hydrogen released to the headspace was determined by GC using thermal-conductivity detector. The results showed that with the addition of SiO2 powder, the reduction reaction of carbonyl groups can be greatly facilitated. The method has a good measurement precision (RSD<7.74%) and accuracy (relative error <10% compared with a reference method) in the carbonyl quantification. It is suitable to be used for rapid determination of carbonyl content in lignin and related materials.
authors.affiliation: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.affiliation: College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China.
authors.forename: Hui-Chao
authors.initials: HC
authors.lastname: Hu
authors.affiliation: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China. Electronic address: xschai@gmail.com.
authors.forename: Xin-Sheng
authors.initials: XS
authors.lastname: Chai
mesh_terms: D000447:Aldehydes / Q000737:chemistry; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D002849:Chromatography, Gas; D008031:Lignin / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D012996:Solutions
chemical_list: D000447:Aldehydes; D012996:Solutions; D012822:Silicon Dioxide; D008031:Lignin
keywords: Carbonyl groups; Headspace gas chromatography; Lignin; Sodium borohydride