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Holzforschung

International Journal of the Biology, Chemistry, Physics, and Technology of Wood

Editor-in-Chief: Faix, Oskar

Editorial Board Member: Daniel, Geoffrey / Militz, Holger / Rosenau, Thomas / Salmen, Lennart / Sixta, Herbert / Vuorinen, Tapani / Argyropoulos, Dimitris S. / Balakshin, Yu / Barnett, J. R. / Berry, Richard / Burgert, Ingo / Evans, Robert / Evtuguin, Dmitry V. / Frazier, Charles E. / Fukushima, Kazuhiko / Gellerstedt, Göran / Gindl-Altmutter, Wolfgang / Glasser, W. G. / Heitner, Cyril / Holmbom, Bjarne / Isogai, Akira / Kadla, John F. / Kleen, Marjatta / Koch, Gerald / Lachenal, Dominique / Mansfield, Shawn D. / Morrell, J.J. / Niemz, Peter / Pizzi, Antonio / Ragauskas, Arthur J. / Ralph, John / Rice, Robert W. / Salin, Jarl-Gunnar / Schmitt, Uwe / Schultz, Tor P. / Schwanninger, Manfred / Sipilä, Jussi / Tamminen, Tarja / Viikari, Liisa / Welling, Johannes / Willför, Stefan / Yoshihara, Hiroshi

8 Issues per year

IMPACT FACTOR 2013: 2.339
Rank 8 out of 64 in category Forestry and 2 out of 21 in category Materials Science, Paper & Wood in the 2013 Thomson Reuters Journal Citation Report/Science Edition

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Polyoxometalate (POM) oxidation of lignin model compounds

Yong Sik Kim1 / Hou-min Chang2 / John F. Kadla3

1Biomaterials Chemistry, Faculty of Forestry, University of British Columbia, Vancouver, BC, Canada

2College of Natural Resources, North Carolina State University, Raleigh, NC 27695-8005, USA

3Biomaterials Chemistry, Faculty of Forestry, University of British Columbia, Vancouver, BC, Canada

Corresponding author. Biomaterials Chemistry, Faculty of Forestry, University of British Columbia, Vancouver, BC, Canada Phone: +1-604-822-5254, Fax: +1-604-822-9104,

Citation Information: Holzforschung. Volume 62, Issue 1, Pages 38–49, ISSN (Online) 1437434X, ISSN (Print) 00183830, DOI: 10.1515/HF.2008.006, December 2007

Publication History

Received:
2007-05-01
Accepted:
2007-08-06
Published Online:
2007-12-05

Abstract

Various lignin model compounds were oxidized with polyoxometalate (POM), K5[SiVW11O40]·12 H2O, in sodium acetate buffer (I=0.2 M, pH 5.0) and the reaction kinetics were investigated. The reactions were found to have second order reaction rates, first order with regards to both lignin model compound and POM. A dramatic increase in reactivity was observed upon addition of methoxyl groups in ortho-positions to the phenolic hydroxyl group. Syringyl units reacted faster than guaiacyl units. Reaction rates of para-substituted guaiacyl and syringyl model compounds showed a strong dependency on the nature of the substituents. The reaction rate of a 5-5′ dimer lignin model compound was extremely fast. The addition of the ortho-phenol substituent not only increased the electron density of the aromatic ring, but also helped stabilize the intermediate phenoxy radical through resonance stabilization and delocalization.

Keywords: kinetics; lignin model compounds; oxidation; polyoxometalate (POM)

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