@article{10272/22615,
year = {2023},
month = {10},
url = {https://hdl.handle.net/10272/22615},
abstract = {Kraft lignins from different poplar genotypes (Populus alba L. “PO-10-10-20” and Populus x canadensis “Ballotino”) were isolated by selective acid precipitation (pH 5 and 2.5), chemically and structurally characterized and used together with cellulose acetate (CA) for the manufacture of nanostructures by electrospinning. Generally, lignins showed a predominance of β-β´resinols substructures (4.7–5.3 linkages per 100 aromatic units) followed by β-O-4´(1.6–3.3 linkages per 100 aromatic units) and β-5´phenylcoumarans (0.5–2.4 linkages per 100 aromatic units) and a high abundance of S lignin units (S/G 3.0–4.3). Moreover, lignins showed low molecular weight values (between 5.14 and 5.59 KDa) and high phenolic content (529.1 –644.5 mg GAE/g lignin). Regarding the electrospun nanostructures obtained from Kraft lignins/CA solutions, all of them presented uniform cross-linked nanofibers with a few beaded fibers according to the suitable range values of surface tension (29.18–29.71 mN/ cm), electrical conductivity (131.2–158.9 μS/cm) and dynamic viscosity (0.28–0.32 Pa.s) that biopolymer solutions showed. Nevertheless, electrospun Kraft lignins/CA nanostructures with larger mean diameters were generated from lignins at pH 5, which displayed higher phenolic and β-O-4´contents compared to lignins at pH 2.5. On the other hand, the type of poplar lignin genotype did not exert a significant influence on the mean fiber diameter},
organization = {This work is part of two coordinated research projects (RTI2018- 096080-B-C21 and RTI2018-096080-B-C22) funded by MCIN/AEI/10 .13039/501100011033 and by “ERDF A way of making Europe”. The authors also wish to thank the Comunidad de Madrid and MCIN/AEI/ FEDER, EU for funding this study via Projects SUSTEC-CM S2018/EMT- 4348 and TED2021-132122B-C21, respectively. The authors also acknowledge the pre-doctoral grants from Jos´ e Fernando Rubio Valle (Ref. PRE2019-090632)},
publisher = {Elsevier},
title = {Kraft lignins from different poplar genotypes obtained by selective acid precipitation and their use for the production of electrospun nanostructures},
doi = {10.1016/j.reactfunctpolym.2023.105685},
author = {Ibarra, David and García Fuentevilla, Luisa and Rubio Valle, José Fernando and Martín Sampedro, Raquel and Valencia Barragán, Concepción and Eugenio, María Eugenia},
}