Effect of urea on cellulose degradation under conditions of alkaline pulping
authors Ershova, O; da Costa, EV; Fernandes, AJS; Domingues, MR; Evtuguin, DV; Sixta, H
nationality International
journal CELLULOSE
author keywords Cellulose; Urea; Alkaline pulping; Peeling reactions; Carbamation; Maillard reaction
keywords CARBONYL GROUPS; MASS-SPECTROMETRY; HOT ALKALI; KINETICS; OLIGOSACCHARIDES; POLYSACCHARIDES; HYDROCELLULOSE; ADDITIVES; PRODUCTS; WOOD
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 C-13 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.
publisher SPRINGER
issn 0969-0239
year published 2012
volume 19
issue 6
beginning page 2195
ending page 2204
digital object identifier (doi) 10.1007/s10570-012-9791-4
web of science category Materials Science, Paper & Wood; Materials Science, Textiles; Polymer Science
subject category Materials Science; Polymer Science
unique article identifier WOS:000310538300031
  ciceco authors
  impact metrics
journal analysis (jcr 2017):
journal impact factor 3.809
5 year journal impact factor 4.120
category normalized journal impact factor percentile 94.489
dimensions (citation analysis):
altmetrics (social interaction):



 


Sponsors

1suponsers_list_ciceco.jpg