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- W2017241310 abstract "Summary Quercus suber L. milled cork lignins obtained from extractive-free cork (MCL) and from saponified cork (MCL sap ) were characterized by thioacidolysis and KMnO 4 oxidation. These techniques and the previously used analytical pyrolysis revealed that cork contains a guaiacyl lignin (G lignin) with 94–96% guaiacyl-, ca. 3% syringyl-, and 2–3% of 4-hydroxyphenyl-propane units. The total yields of degradation products in thioacidolysis and KMnO 4 oxidation experiments were lower in comparison to those of a spruce milled wood lignin (MWL spruce ) suggesting a higher cross-linking in the G-lignin of cork. The higher frequency of “condensed” structures (having C-C or C-O-C linkages to aromatic rings) in cork lignin was also manifested in the relative abundance of various aromatic acids obtained by KMnO 4 oxidation. The cork lignin (MCL sap ) contains only low amounts (ca. 2%) of covalently bonded suberinic acids. Numerous free aliphatic suberinic acids were detected and identified in the ether soluble part of MCL sap . Ferulic acid was not liberated by thioacidolysis, pointing at an in situ acylation. We suggest that the major part of the aromatic domain in cork is a G-lignin but that it includes also another structural moiety with higher H-unit content and linked by thioacidolysis resistant bonds." @default.
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- W2017241310 title "Structural Characterization of Cork Lignin by Thioacidolysis and Permanganate Oxidation" @default.
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- W2017241310 doi "https://doi.org/10.1515/hf.1999.028" @default.
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