Journal
CHEMSUSCHEM
Volume 10, Issue 5, Pages 830-835Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201700101
Keywords
analytical methods; GC-FID; lignin dimers; response factor; synthesis design
Funding
- China Scholarship Council, State Education Department
- DOE Great Lakes Bioenergy Research Center (DOE BER Office of Science) [DE-FC02-07ER64494]
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Lignin structural studies play an essential role both in understanding the development of plant cell walls and for valorizing lignocellulosics as renewable biomaterials. Dimeric products released by selectively cleaving beta-aryl ether linkages between lignin units reflect the distribution of recalcitrant lignin units, but have been neither absolutely defined nor quantitatively determined. Here, 12 guaiacyl-type thioacidolysis dimers were identified and quantified using newly synthesized standards. One product previously attributed to deriving from beta-1-coupled units was established as resulting from beta-5 units, correcting an analytical quandary. Another longstanding dilemma, that no beta-beta dimers were recognized in thioacidolysis products from gymnosperms, was resolved with the discovery of two such authenticated compounds. Individual GC response factors for each standard compound allowed rigorous quantification of dimeric products released from softwood lignins, affording insight into the various interunit-linkage distributions in lignins and thereby guiding the valorization of lignocellulosics.
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