Organosolv pretreatment represents one of the most promising biomass valorization strategies for renewable carbon-based products; meanwhile, there is an overall lack of holistic approach to how extraction conditions affect the suitable end-usages. In this context, lignin extracted from silver birch (Betula pendula L.) by a novel hybrid organosolv/steam-explosion treatment at varying process conditions (EtOH %; time; catalyst %) was analyzed by quantitative NMR (1H-13C HSQC; 13C NMR; 31P NMR), gel permeation chromatography, Fourier transform infrared (FT-IR), Pyr-gas chromatography-mass spectroscopy (GC/MS), and thermogravimetric analysis, and the physicochemical characteristics of the lignins were discussed regarding their potential usages. Characteristic lignin interunit bonding motifs, such as β-O-4′, β-β′, and β-5′, were found to dominate in the extracted lignins, with their abundance varying with treatment conditions. Low-molecular-weight lignins with fairly unaltered characteristics were generated via extraction with the highest ethanol content potentially suitable for subsequent production of free phenolics. Furthermore, β-β′ and β-5′ structures were predominant at higher acid catalyst contents and prolonged treatment times. Higher acid catalyst content led to oxidation and ethoxylation of side-chains, with the concomitant gradual disappearance of p-hydroxycinnamyl alcohol and cinnamaldehyde. This said, the increasing application of acid generated a broad set of lignin characteristics with potential applications such as antioxidants, carbon fiber, nanoparticles, and water remediation purposes.
Paulsen Thoresen, P., Lange, H., Crestini, C., Rova, U., Matsakas, L., & Christakopoulos, P. (2021). Characterization of Organosolv Birch Lignins: Toward Application-Specific Lignin Production. ACS OMEGA, 6(6), 4374-4385.
|Citazione:||Paulsen Thoresen, P., Lange, H., Crestini, C., Rova, U., Matsakas, L., & Christakopoulos, P. (2021). Characterization of Organosolv Birch Lignins: Toward Application-Specific Lignin Production. ACS OMEGA, 6(6), 4374-4385.|
|Tipo:||Articolo in rivista - Articolo scientifico|
|Carattere della pubblicazione:||Scientifica|
|Presenza di un coautore afferente ad Istituzioni straniere:||Si|
|Titolo:||Characterization of Organosolv Birch Lignins: Toward Application-Specific Lignin Production|
|Autori:||Paulsen Thoresen, P; Lange, H; Crestini, C; Rova, U; Matsakas, L; Christakopoulos, P|
|Data di pubblicazione:||2021|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1021/acsomega.0c05719|
|Appare nelle tipologie:||01 - Articolo su rivista|
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