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Int J Mol Sci. 2012 Nov 16;13(11):15209-26. doi: 10.3390/ijms131115209.

Isolation and structural characterization of lignin from cotton stalk treated in an ammonia hydrothermal system.

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  • 1Institute of Biomass Chemistry and Technology, Beijing Forestry University, Beijing 100083, China. xm_zhang@bjfu.edu.cn

Abstract

To investigate the potential for the utilization of cotton stalk, ammonia hydrothermal treatment was applied to fractionate the samples into aqueous ammonia-soluble and ammonia-insoluble portions. The ammonia-soluble portion was purified to yield lignin fractions. The lignin fractions obtained were characterized by wet chemistry (carbohydrate analysis) and spectroscopy methods (FT-IR, 13C and 1H-13C HSQC NMR spectroscopy) as well as gel permeation chromatography (GPC). The results showed that the cotton stalk lignin fractions were almost absent of neutral sugars (0.43%-1.29%) and had relatively low average molecular weights (1255-1746 g/mol). The lignin fractions belonged to typical G-S lignin, which was composed predominately of G-type units (59%) and noticeable amounts of S-type units (40%) together with a small amount of H-type units (~1%). Furthermore, the ammonia-extractable lignin fractions were mainly composed of β-0-4' inter-unit linkages (75.6%), and small quantities of β-β' (12.2%), together with lower amounts of β-5' carbon-carbon linkages (7.4%) and p-hydroxycinnamyl alcohol end groups.

PMID:
23203120
[PubMed - indexed for MEDLINE]
PMCID:
PMC3509636
Free PMC Article
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