Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 37, Issue 1, Pages 51-60Publisher
ELSEVIER
DOI: 10.1016/j.indcrop.2011.11.033
Keywords
Bamboo culms; Lignin; GPC; Fr-IR; C-13 NMR; HSQC
Categories
Funding
- State Forestry Administration [200804015]
- Major State Basic Research Projects of China [973-2010CB732204]
- National Natural Science Foundation of China [31110103902]
- China Ministry of Education [111]
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A sequential process with the combination of ethanol and alkali aqueous solutions was utilized to extract lignin from bamboo (Neosinocalamus affinis), a potential lignocellulosic material. In this case, the successive treatments of dewaxed bamboo with 70% ethanol at 80 degrees C, 0.2 and 0.5 M NaOH, 70% ethanol containing 0.6 M NaOH, and 1.0, 2.0, and 3.0 M NaOH at 50 degrees C, resulted in a total yield of acid-insoluble lignin fractions of 10.06%, corresponding to release of 62.25% original lignin from the cell walls. The lignin fractions obtained were then characterized by GPC, FT-IR, NMR spectroscopy, and sugar analysis. As compared to the alkali lignin fractions, the ethanol-soluble lignin fraction had a relatively higher molecular weight (2670 g/mol) and the content of carbohydrates primarily consisted of glucose 2.01% and xylose 1.90%. This suggested that the carbohydrate chains linked to lignin may increase the hydrodynamic volume of lignin and therefore increase the apparent molecular weight of the ethanol-soluble lignin. HSQC spectra analysis revealed that the alkali lignin fractions consisted mainly of beta-O-4' linkages combined with small amounts of beta-beta', beta-5', beta-1' linkages, and p-hydroxycinnamyl alcohol end groups. Furthermore, minor amounts of esterified p-coumaric and ferulic acids were also detected in the lignins isolated. (c) 2011 Elsevier B.V. All rights reserved.
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