Study of Structure of Industrial Acid Hydrolysis Lignin,Oxidized in the H2O2-H2SO4 System |
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| Authors: | Edward I Evstigneyev Oleg S Yuzikhin Andrey A Gurinov Alexandr Yu Ivanov Tatiana O Artamonova Mikhail A Khodorkovskiy |
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| Affiliation: | 1. Department of Chemistry, Saint Petersburg State Forest Technical University, Saint Petersburg, Russia;2. Center for Magnetic Resonance, St. Petersburg State University, Saint Petersburg, Russia;3. Institute of Nanobiotechnologies, Saint Petersburg Polytechnical University, Saint Petersburg, Russia |
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| Abstract: | Products of oxidation of industrial acid hydrolysis lignin in the H2O2-H2SO4 system were studied using 13C NMR (in solution and solid state), MALDI-MS, and MS(ESI) techniques. Oxidation of hydrolysis lignin leads to the opening of aromatic rings of lignin, yielding carboxylic groups. Alkyl aryl ether linkages (β-O-4-bonds) between lignin phenyl propane units are not significantly affected by the oxidation. The structure of oxidized hydrolysis lignin is proposed. The basic structural unit of oxidized hydrolysis lignin is a muconic acid derivative. |
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| Keywords: | Acid hydrolysis lignin oxidation NMR MALDI-MS MS(ESI) |
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