期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 60, 期 36, 页码 8968-8973出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf303003d
关键词
lignin; molar mass determination; size exclusion chromatography; acetyl bromide; P-31 NMR; acetobromination; derivatization; acetylation; kraft lignin; milled wood lignin
资金
- Tekes
- Metso Power Oy
- Oy Metsa-Botnia Ab
- Stora Enso Oyj
- Roal Oy
The accurate and reproducible determination of lignin molar mass by using size exclusion chromatography (SEC) is challenging. The lignin association effects, known to dominate underivatized lignins, have been thoroughly addressed by reaction with acetyl bromide in an excess of glacial acetic acid. The combination of a concerted acetylation with the introduction of bromine within the lignin alkyl side chains is thought to be responsible for the observed excellent solubilization characteristics acetobromination imparts to a variety of lignin samples. The proposed methodology was compared and contrasted to traditional lignin derivatization methods. In addition, side reactions that could possibly be induced under the acetobromination conditions were explored with native softwood (milled wood lignin, MWL) and technical (kraft) lignin. These efforts lend support toward the use of room temperature acetobromination being a facile, effective, and universal lignin derivatization medium proposed to be employed prior to SEC measurements.
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