Document Detail

Formation of carbonyl groups on cellulose during ozone treatment of pulp: Consequences for pulp bleaching.
MedLine Citation:
PMID:  24815405     Owner:  NLM     Status:  In-Data-Review    
The formation of carbonyl groups during the ozone treatment (Z) of eucalyptus (Eucalyptus grandis and Eucalyptus urophylla hybrid) kraft pulps and their behaviors during subsequent alkaline stages were investigated by the CCOA method with carbazole-9-carboxylic acid [2-(2-aminooxethoxy)-ethoxy] amide (CCOA) as the carbonyl-selective fluorescence label. Several pulp samples with or without lignin and hexenuronic acids (hexA) were used to elucidate the effects of these components when present in unbleached kraft pulp. Both hexA and lignin increased the formation of carbonyl groups on cellulose and hemicellulose during ozonation. It was concluded that radicals are likely formed when ozone reacts with either lignin or hexA. These carbonyl groups were involved in cellulose depolymerization during subsequent alkaline extraction stages with sodium hydroxide (E) and alkaline hydrogen peroxide (P, in ZEP or ZP). Their numbers decreased after E but increased during P when H2O2 was not stabilized enough. Several ways to minimize the occurrence of carbonyl group formation are suggested.
Frédéric Pouyet; Christine Chirat; Antje Potthast; Dominique Lachenal
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Publication Detail:
Type:  Journal Article     Date:  2014-03-11
Journal Detail:
Title:  Carbohydrate polymers     Volume:  109     ISSN:  1879-1344     ISO Abbreviation:  Carbohydr Polym     Publication Date:  2014 Aug 
Date Detail:
Created Date:  2014-05-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8307156     Medline TA:  Carbohydr Polym     Country:  England    
Other Details:
Languages:  eng     Pagination:  85-91     Citation Subset:  IM    
Copyright Information:
Copyright © 2014. Published by Elsevier Ltd.
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