Journal
LETTERS IN ORGANIC CHEMISTRY
Volume 8, Issue 6, Pages 436-446Publisher
BENTHAM SCIENCE PUBL LTD
DOI: 10.2174/157017811796064386
Keywords
Gel permeation chromatography; Lignin; steam explosion; FT-ICR MS; MALDI-TOF; H-1 NMR; C-13 NMR
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GPC analysis of a steam exploded lignin from wheat straw showed M-w = 3605 and M-z = 21155 g/mol and a bimodal distribution with molecular weights in the range 100-10000 g/mol. On the contrary, FT-ICR-MS showed that fragments with a mass higher than 4534 Da cannot be obtained. Furthermore, FT-ICR MS showed that lignin is not a completely random polymer, but it showed some regularity with a difference of 44.026 m/z (C2H4O) between the peaks. The distribution of Kendrick mass defect (KMD) in function of Kendrick nominal masses (KNM) showed the same behavior.
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