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01.12.2012 | Original Paper

Effect of urea on cellulose degradation under conditions of alkaline pulping

verfasst von: Olga Ershova, Elisabete V. da Costa, António J. S. Fernandes, M. Rosário Domingues, Dmitry V. Evtuguin, Herbert Sixta

Erschienen in: Cellulose | Ausgabe 6/2012

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Abstract

The effect of urea on the cellulose degradation under conditions of alkaline pulping has been studied using purified cellulose powder. The increased cellulose yield in the presence of urea was assigned essentially to the carbamation reactions which were confirmed by elemental analysis, UV-resonance Raman and solid-state ¹³C nuclear magnetic resonance spectroscopy. The stabilizing effect of urea on the cellulose peeling reactions during heating up period of pulping process was suggested based on kinetic studies and additionally confirmed in model reactions using cellobiose. The reaction products formed in alkaline urea solutions were analysed by tandem electrospray ionization mass spectrometry and the occurrence of Maillard type reactions between reducing end groups of cellobiose and urea were evidenced. Both Maillard type reactions and carbamation of reducing end groups were proposed to be a part of cellulose protection mechanism against peeling under the conditions of alkaline pulping.

Vorheriger Artikel Effect of residual lignin and heteropolysaccharides in nanofibrillar cellulose and nanopaper from wood fibers

Nächster Artikel Improved surface properties of CTMP fibers with enzymatic pretreatment of wood chips prior to refining

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Titel: Effect of urea on cellulose degradation under conditions of alkaline pulping
verfasst von: Olga Ershova
Elisabete V. da Costa
António J. S. Fernandes
M. Rosário Domingues
Dmitry V. Evtuguin
Herbert Sixta
Publikationsdatum: 01.12.2012
Verlag: Springer Netherlands
Erschienen in: Cellulose / Ausgabe 6/2012
Print ISSN: 0969-0239
Elektronische ISSN: 1572-882X
DOI: https://doi.org/10.1007/s10570-012-9791-4

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