Back to Search Start Over

Cellulose oxidation by Laccase-TEMPO treatments.

Cellulose oxidation by Laccase-TEMPO treatments.

Authors :
Quintana E
Roncero MB
Vidal T
Valls C
Source :
Carbohydrate polymers [Carbohydr Polym] 2017 Feb 10; Vol. 157, pp. 1488-1495. Date of Electronic Publication: 2016 Nov 11.
Publication Year :
2017

Abstract

In this work, laccase-TEMPO (Lac-T) treatments were applied to bleached commercial dissolving pulp in order to introduce carbonyl and carboxyl groups, which were found to improve dry and wet strength-related properties. Also the solubility behavior towards xanthate reactions was assessed. The effect of a refining step (R) before the oxidative treatment, the absence or presence of oxygen pressure, TEMPO dose (2 or 8% oven dried pulp) and reaction time (8 or 20h) were thoroughly examined. Treatments conducted in the presence of oxygen pressure exhibited greater amount of functional groups. Introducing a pre-refining treatment resulted in similar functional groups but higher wet strength was achieved. Specifically, a high W/D strength ratio was observed, indicating that wet strength-related property was satisfactorily developed. Besides the fact that all Lac-T treatments caused severe cellulose degradation, no fiber strength loss was detected. In fact, all oxidized samples presented higher Wet Zero-Span Tensile Strength, mainly in R+ Lac-T (O <subscript>2</subscript> ) sample, which suggested the formation of hemiacetal linkages between the new introduced aldehyde groups and available free hydroxyl groups resulting from fibrillation.<br /> (Copyright © 2016 Elsevier Ltd. All rights reserved.)

Details

Language :
English
ISSN :
1879-1344
Volume :
157
Database :
MEDLINE
Journal :
Carbohydrate polymers
Publication Type :
Academic Journal
Accession number :
27987860
Full Text :
https://doi.org/10.1016/j.carbpol.2016.11.033