期刊
BIORESOURCE TECHNOLOGY
卷 100, 期 4, 页码 1628-1633出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2008.08.046
关键词
S:G ratio; Poplars; Permanganate oxidation; Nitrobenzene oxidation; Lignin content
资金
- US Forest Service [03-JV-11231300-048]
- NSF [CHE 0553323]
Two oxidation techniques that afford high yields of monomers and dimers were used to more accurately estimate the syringyl to guaiacyl (S:G) ratio of hardwood lignins. Permanganate oxidation of the wood-meal after a CuO pre-hydrolysis step gave poor results and this was attributed to preferential oxidation and degradation of syringyl nuclei by CuO. However, this procedure did provide a good estimate of the percentages of both S and G phenylpropane (C-9) units that were uncondensed. When the total S and G products from nitrobenzene oxidation (NBO) of the uncondensed fractions were corrected, credible S:G ratios were obtained. These ratios were in good agreement with results from KMnO4 oxidation of dissolved kraft lignin without CuO pre-hydrolysis. The corrected NBO method was used to determine the S:G ratio of 13 poplars, and the values ranged from 1.01 to 1.68. Unlike results from other investigations, an excellent linear correlation (R-2 = 0.846) was obtained for a decreasing lignin content (28% to 16.5%) with an increase in the S:G ratio. (C) 2008 Elsevier Ltd. All rights reserved.
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