@article{10272/20942,
year = {2022},
url = {http://hdl.handle.net/10272/20942},
abstract = {In order to identify new sustainable sources for producing cellulose nanofibers (CNFs),
fast-growing poplar (Populus alba L.) wood was evaluated herein. For that purpose, bleached poplar
kraft pulp was produced and submitted to TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)
mediated oxidation (TEMPO-ox) chemical pretreatment followed by microfluidization. The resulting
CNFs were thoroughly characterized, including a rheological study at different pH values. Poplar
CNFs showed properties comparable to eucalypt CNFs (reference material for CNFs production),
showing high carboxylate content (1048 ± 128 µmol g−1
), fibrillation yield (87.3% ± 8.1%), optical
transmittance (83% at 700 nm) and thermal stability (up to more than 200 ◦C). Regarding the rheological study, whereas pH from 4 to 10 did not produce significant changes in rheological behavior,
a reduction of pH down to 1 led to an order-of-magnitude increase on the viscoelastic functions.
Therefore, poplar CNF shows potential in the pH-sensitive hydrogels application field. Finally, the
possible ecotoxicity of poplar CNF was assessed. The decrease in cell viability was very low so that
only concentrations causing a 10% cytotoxicity could be calculated for the assay detecting alterations
in cell metabolism (10 µg mL−1
) and plasma membrane integrity (60 µg mL−1)},
organization = {This research was funded by Comunidad de Madrid and MCIU/AEI/FEDER, EU via
Projects SUSTEC-CM S2018/EMT-4348 and RTI2018-096080-B-C22, respectively.
Silviculture and Forest Management Department (Forest Research Center, INIA,
CSIC) is acknowledged for fast-growing poplar materials},
publisher = {MDPI},
title = {Populus alba L., an Autochthonous Species of Spain: A Source for Cellulose Nanofibers by Chemical Pretreatment},
doi = {10.3390/polym14010068},
author = {Ibarra, David and Martín Sampedro, Raquel and Wicklein, Bernd and Borrero López, Antonio María and Valencia Barragán, Concepción and Valdehíta, Ana and Navas, José M. and Eugenio, María Eugenia},
}