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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
08/09/2025 |
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Data da última atualização: |
14/11/2025 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
OLIVEIRA, D. R. de; MATOS, M.; SILVA, K. T.; MAZZETTO, S. E.; MAGALHAES, W. L. E.; LOMONACO, D.; AVELINO, F. |
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Afiliação: |
DAVI R. DE OLIVEIRA, UNIVERSIDADE FEDERAL DO CEARÁ; MAURÍCIO MATOS, SENAI; KÁSSIA T. SILVA, UNIVERSIDADE FEDERAL DO CEARÁ; SELMA E. MAZZETTO, UNIVERSIDADE FEDERAL DO CEARÁ; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF; DIEGO LOMONACO, UNIVERSIDADE FEDERAL DO CEARÁ; FRANCISCO AVELINO, UNIVERSIDADE FEDERAL DO CEARÁ. |
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Título: |
Unveiling the mechanistic aspects of different delignification methods and their effects on the structure of technical Eucalyptus lignins. |
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Ano de publicação: |
2025 |
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Fonte/Imprenta: |
Biomass Conversion and Biorefinery, 2025. |
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ISSN: |
2190-6815 |
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DOI: |
https://doi.org/10.1007/s13399-025-06502-y |
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Idioma: |
Inglês |
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Notas: |
First online. |
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Conteúdo: |
The correct application of lignin is directly related to its structure which is strongly affected by the extraction method. In this work, three technical lignins were obtained from Eucalyptus urograndis by Kraft, fast pyrolysis (FP), and microwave-assisted organosolv delignification (MWAOD), and their structural and antioxidant properties were evaluated and compared to those of milled wood lignin (MWL). The samples were characterized by FTIR, 2D and 31P NMR, GPC, TGA, DSC and DPPH. assay. The technical lignins were obtained with elevated yields (33 – 68.5%) and high purities (76 – 93%). The combination of different analytical techniques showed that the higher the severity the lower the molecular weights (657 – 1959 g mol− 1), the higher the quantity of condensed structures (β-5’ and β-β’), and the higher the concentration of phenolic hydroxyls. During MWAOD process, partial acetylation of aliphatic hydroxyls of organosolv lignin (OL) occurred under mild conditions. The thermal stability and the molecular mobility of lignins were also affected by the nature of the extraction method. The DPPH. assay showed that the structural features of lignins also affected their antioxidant activities, since the IC50 values varied from 13.2 to 19.3 μg mL− 1. Therefore, three technical lignins with different structural features were obtained from the same biomass through distinct processes, offering different possibilities for their valorization. |
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Palavras-Chave: |
Eucalyptus urograndis; Madeira de lei. |
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Thesagro: |
Lignina. |
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Thesaurus Nal: |
Eucalyptus; Hardwood; Lignin. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 02370naa a2200301 a 4500
001 2178630
005 2025-11-14
008 2025 bl uuuu u00u1 u #d
022 $a2190-6815
024 7 $ahttps://doi.org/10.1007/s13399-025-06502-y$2DOI
100 1 $aOLIVEIRA, D. R. de
245 $aUnveiling the mechanistic aspects of different delignification methods and their effects on the structure of technical Eucalyptus lignins.$h[electronic resource]
260 $c2025
500 $aFirst online.
520 $aThe correct application of lignin is directly related to its structure which is strongly affected by the extraction method. In this work, three technical lignins were obtained from Eucalyptus urograndis by Kraft, fast pyrolysis (FP), and microwave-assisted organosolv delignification (MWAOD), and their structural and antioxidant properties were evaluated and compared to those of milled wood lignin (MWL). The samples were characterized by FTIR, 2D and 31P NMR, GPC, TGA, DSC and DPPH. assay. The technical lignins were obtained with elevated yields (33 – 68.5%) and high purities (76 – 93%). The combination of different analytical techniques showed that the higher the severity the lower the molecular weights (657 – 1959 g mol− 1), the higher the quantity of condensed structures (β-5’ and β-β’), and the higher the concentration of phenolic hydroxyls. During MWAOD process, partial acetylation of aliphatic hydroxyls of organosolv lignin (OL) occurred under mild conditions. The thermal stability and the molecular mobility of lignins were also affected by the nature of the extraction method. The DPPH. assay showed that the structural features of lignins also affected their antioxidant activities, since the IC50 values varied from 13.2 to 19.3 μg mL− 1. Therefore, three technical lignins with different structural features were obtained from the same biomass through distinct processes, offering different possibilities for their valorization.
650 $aEucalyptus
650 $aHardwood
650 $aLignin
650 $aLignina
653 $aEucalyptus urograndis
653 $aMadeira de lei
700 1 $aMATOS, M.
700 1 $aSILVA, K. T.
700 1 $aMAZZETTO, S. E.
700 1 $aMAGALHAES, W. L. E.
700 1 $aLOMONACO, D.
700 1 $aAVELINO, F.
773 $tBiomass Conversion and Biorefinery, 2025.
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