Cellulose oxidation by Laccase-TEMPO treatments
10.1016/j.carbpol.2016.11.033
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/100104
Tipus de documentArticle
Data publicació2017-02-10
Condicions d'accésAccés obert
Tots els drets reservats. Aquesta obra està protegida pels drets de propietat intel·lectual i
industrial corresponents. Sense perjudici de les exempcions legals existents, queda prohibida la seva
reproducció, distribució, comunicació pública o transformació sense l'autorització del titular dels drets
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 20 h) 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 (O2) sample, which suggested the formation of hemiacetal linkages between the new introduced aldehyde groups and available free hydroxyl groups resulting from fibrillation
CitacióQuintana, E., Roncero, M.B., Vidal, T., Valls, C. Cellulose oxidation by Laccase-TEMPO treatments. "Carbohydrate polymers", 10 Febrer 2017, vol. 157, p. 1488-1495.
ISSN0144-8617
Versió de l'editorhttp://www.sciencedirect.com/science/article/pii/S014486171631298X
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
Quintana, E. Ce ... ccase TEMPO treatments.pdf | 350,5Kb | Visualitza/Obre |