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Changes in chemical structures of wheat straw auto-hydrolysis lignin by 3-hydroxyanthranilic acid as a laccase mediator
Hubei Univ Technol, Wuhan 430068, Hubei, Peoples R China.;Nanjing Forestry Univ, Nanjing 210037, Jiangsu, Peoples R China..
Nanjing Forestry Univ, Nanjing 210037, Jiangsu, Peoples R China..
Nanjing Forestry Univ, Nanjing 210037, Jiangsu, Peoples R China..
Hubei Univ Technol, Wuhan 430068, Hubei, Peoples R China..
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2019 (English)In: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 122, p. 210-215Article in journal (Refereed) Published
Abstract [en]

3-Hydroxyanthranilic acid (3-HAA), as a potential natural laccase mediator, was shown to mediate the oxidation of non-phenolic lignin subunits. The problem of cost and toxicity of artificial mediators could be solved to some extent by a further study about the detailed changes of lignin chemistry structures in laccase 3-HAA system (LHS). In this work, wheat straw auto-hydrolysis lignin (AL) was prepared. Oxidations of AL by LHS and laccase 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) system were then investigated, respectively. Various structural changes of AL during the oxidation were characterized by different methods including phenolic hydroxyl group determination, nitrobenzene oxidation, ozonation, gel permeation chromatography, ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy and two-dimensional nuclear magnetic resonance (2D NMR) spectroscopy. The changes in AL chemical structures were found in LHS, including unit removal, bond cleavage and biopolymerization. Compared to laccase ABTS system, a selective removal of guaiacyl-type lignin in LHS was observed, based on the results of nitrobenzene oxidation and 2D NMR analysis. The selective removal of guaiacyl-type lignin was due to improved aromatic ring cleavage and weaken lignin biopolymerization. The selectivity of guaiacyl-type lignin removal in LHS plays an important role, especially for improving bioconversion efficiency of laccase for guaiacyl-rich lignocellulosic biomass.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2019. Vol. 122, p. 210-215
Keywords [en]
Laccase, 3-Hydroxyanthranilic acid, Auto-hydrolysis lignin, Biopolymerization, Guaiacyl unit
National Category
Organic Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-243943DOI: 10.1016/j.ijbiomac.2018.10.153ISI: 000456226700024PubMedID: 30365991Scopus ID: 2-s2.0-85055753669OAI: oai:DiVA.org:kth-243943DiVA, id: diva2:1293922
Note

QC 20190305

Available from: 2019-03-05 Created: 2019-03-05 Last updated: 2019-03-05Bibliographically approved

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Ek, Monica

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