Lignin model

Chemistry ofDelig niiic tion. The chemistry of delignification is complex and, despite the extensive Hterature, not completely understood. A variety of lignin model compounds have been studied and the results compared with the observed behavior of lignin during pulping (1,10—12,16). 

Habu N, M Samejima, T Yoshimoto (1989a) A novel dioxygenase responsible for the Ca-Cp cleavage of lignin model compounds from Pseudomonas sp. TMY1009. Mokuzai Gakkaishi 35 26-29. 

Kondo R, H Yamagami, K Sakai (1993) Xylosation of phenolic hydroxyl groups of the monomeric lignin model compounds 4-methylgnaiacol and vanillyl alcohol by Coriolus versicolor. Appl Environ Microbiol 59 438-441. 

Ralph, J. Reactions of lignin model quinone methides and NMR studies of lignins. Ph. D. thesis, University of Wisconsin—Madison, University Microfilms DA 82-26987.1982. 

Ralph, J. Adams, B. R. Determination of the conformation and isomeric composition of lignin model quinone methides by NMR. J. Wood Chem. Technol. 1983, 3, 183-194. 

Ralph, J. Ede, R. M. Robinson, N. P. Main, L. Reactions of P-aryl lignin model quinone methides with anthrahydroquinone and anthranol. J. Wood Chem. Technol. 1987, 7, 133-160. 

Landucci, L. L. Ralph, J. Adducts of anthrahydroquinone and anthranol with lignin model quinone methides. 1. Synthesis and characterization. J. Org. Chem. 1982, 47, 3486-3495. 

Quideau, S. Ralph, J. A biomimetic route to lignin model compounds via silver(I) oxide oxidation. 1. Synthesis of dilignols and non-cyclic benzyl aryl ethers. Holzforschung 1994, 48, 12-22. 

Zanarotti, A. Synthesis and reactivity of lignin model quinone methides. Biomimetic synthesis of 8.0.4 neolignans. J. Chem. Res., Synop. 1983, 306-307. 

Ralph, J. Lignin model quinone methides—facts and fallacies. In Proceedings of the Third International Symposium of Wood and Pulping Chemistry, Vancouver, BC, Canada, Chemical Institute of Canada (CIC), and Canadian Pulp and Paper Association (CPPA), Canada. 1985. 

Ralph, J. Helm, R. F. Rapid proton NMR method for determination of threo.erythro ratios in lignin model compounds and examination of reduction stereochemistry. J. Agric. Food Chem. 1991, 39, 705-709. 

Brunow, G. Ronnberg, M. The peroxidatic oxidation of some phenolic lignin model compounds. Acta Chem. Scand., Ser. B 1979, 33, 22-26. 

Hydrogenolysis of Lignin Model Compounds Using In-Situ, Water-Soluble Ru/P(CH2OH)3... 

TABLE 8. Results of Reactions Containing Lignin Models... 

Bourbonnais R, Leech D, Paice MG (1998) Electrochemical analysis of the interaction of laccase with lignin model compounds. Biochim Biophys Acta 1379 381-390... 

Caldwell, E.S. and Steelink, C. (1969). Phenoxy radical intermediates in the enzymatic degradation of lignin model compounds. Biochimica et Biophysica Acta, 184,420-431. 

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