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Registros recuperados : 6 | |
1. | | MATOS, M.; CLARO, F. C.; LIMA, T. A. M.; AVELINO, F.; HANSEL, F. A.; MACIEL, G. M.; LOMONACO, D.; MAGALHAES, W. L. E. Acetone: water fractionation of pyrolytic lignin improves its antioxidant and antibacterial activity. Journal of Analytical and Applied Pyrolysis, v. 156, 105175, 2021. Biblioteca(s): Embrapa Florestas. |
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2. | | CLARO, F. C.; LIMA, G. G. de; LIMA, T. A. M. de; HANSEL, F. A.; MATOS, M.; AVELINO, F.; OLIVEIRA, D. R.; LOMONACO, D.; MAGALHAES, W. L. E. Characterisation of laccase-mediated lignin polymerisation: implications for molecular weight, thermal stability, and electrical properties. Biomass Conversion and Biorefinery, 2023. First online. Biblioteca(s): Embrapa Florestas. |
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3. | | LIMA, G. G. de; AGGIO, B.; MATOS, M.; LIMA, T. A. M. de; PEREIRA, B. L.; PEDRO, A. C.; MAGALHAES, W. L. E. Cryoslash as an effective pre-treatment to obtain nanofibrillated cellulose using ultra-fine friction grinder with kraft pulp. Nordic Pulp & Paper Research Journal, v. 38, n. 2, p. 333-341, 2023. Biblioteca(s): Embrapa Florestas. |
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4. | | ALIABADI, M.; CHEE, B. S.; MATOS, M.; CORTESE, Y. J.; NUGENT, M. J. D.; LIMA, T. A. M. de; MAGALHAES, W. L. E.; LIMA, G. G. de. Yerba mate extract in microfibrillated cellulose and corn starch films as a potential wound healing bandage. Polymers, v. 12, 2807, 2020. Biblioteca(s): Embrapa Florestas. |
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5. | | LIMA, G. G. de; MIRANDA, N. B. de; TIMM, T. G.; MATOS, M.; LIMA, T. A. M. de; MAGALHAES, W. L. E.; TAVARES, L. B. B.; HANSEL, F. A.; HELM, C. V. Characterisation and in vivo evaluation of Araucaria angustifolia pinhão seed coat nanosuspension as a functional food source. Food & Function, v. 11, p. 9820-9832, 2020. Biblioteca(s): Embrapa Florestas. |
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6. | | ALIABADI, M.; CHEE, B. S.; MATOS, M.; CORTESE, Y. J.; NUGENT, M. J. D.; LIMA, T. A. M. de; MAGALHAES, W. L. E.; LIMA, G. G. de; FIROUZABADI, M. D. Microfibrillated cellulose films containing chitosan and tannic acid for wound healing applications. Journal of Materials Science. Materials in Medicine, v. 32, n. 6, article 67, June 2021. 12 p. Biblioteca(s): Embrapa Florestas. |
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Registros recuperados : 6 | |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Florestas. |
Data corrente: |
17/05/2024 |
Data da última atualização: |
17/05/2024 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 4 |
Autoria: |
CLARO, F. C.; LIMA, G. G. de; LIMA, T. A. M. de; HANSEL, F. A.; MATOS, M.; AVELINO, F.; OLIVEIRA, D. R.; LOMONACO, D.; MAGALHAES, W. L. E. |
Afiliação: |
FRANCINE C. CLARO, UNIVERSIDADE FEDERAL DO PARANÁ; GABRIEL G. DE LIMA, UNIVERSIDADE FEDERAL DO PARANÁ; TIELIDY A. M. DE LIMA, TECHNOLOGICAL UNIVERSITY OF THE SHANNON; FABRICIO AUGUSTO HANSEL, CNPF; MAILSON MATOS, SENAI; FRANCISCO AVELINO, INSTITUTO FEDERAL DE EDUCAÇÃO, CIÊNCIA E TECNOLOGIA DO CEARÁ; DAVI R. OLIVEIRA, UNIVERSIDADE FEDERAL DO CEARÁ; DIEGO LOMONACO, UNIVERSIDADE FEDERAL DO CEARÁ; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF. |
Título: |
Characterisation of laccase-mediated lignin polymerisation: implications for molecular weight, thermal stability, and electrical properties. |
Ano de publicação: |
2023 |
Fonte/Imprenta: |
Biomass Conversion and Biorefinery, 2023. |
DOI: |
http://dx.doi.org/10.1007/s13399-023-05040-9 |
Idioma: |
Português |
Notas: |
First online. |
Conteúdo: |
Kraft lignin was oligomerised using a bulk laccase solution in varying amounts of buffer and ethanol solvents. The activity of laccase and kinetic parameters was analysed by adjusting the buffer pH and ethanol:buffer ratio. The qualitative weighted average molecular weight (Mw) distribution showed significant variation when ethanol (40:60) solvent was used. GPC analysis confirmed the presence of fractions with higher molecular weight, where the Mw after 30 min was 7859, compared to 90 min in the buffer medium, where M w was only 1779. These condensed units exhibited lower antioxidant values, characteristic of a polymerisation reaction. Py-GC/MS analysis demonstrated that the sample with the highest molecular weight displayed increased G-type lignin units and higher levels of polysaccharides residue compared to the original kraft lignin. The addi- tion of ethanol as a green solvent, mixed with buffer, resulted in a 4.4-fold increase in M w compared to buffer alone. These findings highlight the advantageous role of ethanol as a medium to obtain lignin units with high molecular weight. |
Palavras-Chave: |
Electric conduction; Kraft lignin; Laccase polymerisation; Lignin polymerisation. |
Thesagro: |
Etanol; Lignina. |
Thesaurus NAL: |
Antioxidants. |
Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
Marc: |
LEADER 02086naa a2200325 a 4500 001 2164307 005 2024-05-17 008 2023 bl uuuu u00u1 u #d 024 7 $ahttp://dx.doi.org/10.1007/s13399-023-05040-9$2DOI 100 1 $aCLARO, F. C. 245 $aCharacterisation of laccase-mediated lignin polymerisation$bimplications for molecular weight, thermal stability, and electrical properties.$h[electronic resource] 260 $c2023 500 $aFirst online. 520 $aKraft lignin was oligomerised using a bulk laccase solution in varying amounts of buffer and ethanol solvents. The activity of laccase and kinetic parameters was analysed by adjusting the buffer pH and ethanol:buffer ratio. The qualitative weighted average molecular weight (Mw) distribution showed significant variation when ethanol (40:60) solvent was used. GPC analysis confirmed the presence of fractions with higher molecular weight, where the Mw after 30 min was 7859, compared to 90 min in the buffer medium, where M w was only 1779. These condensed units exhibited lower antioxidant values, characteristic of a polymerisation reaction. Py-GC/MS analysis demonstrated that the sample with the highest molecular weight displayed increased G-type lignin units and higher levels of polysaccharides residue compared to the original kraft lignin. The addi- tion of ethanol as a green solvent, mixed with buffer, resulted in a 4.4-fold increase in M w compared to buffer alone. These findings highlight the advantageous role of ethanol as a medium to obtain lignin units with high molecular weight. 650 $aAntioxidants 650 $aEtanol 650 $aLignina 653 $aElectric conduction 653 $aKraft lignin 653 $aLaccase polymerisation 653 $aLignin polymerisation 700 1 $aLIMA, G. G. de 700 1 $aLIMA, T. A. M. de 700 1 $aHANSEL, F. A. 700 1 $aMATOS, M. 700 1 $aAVELINO, F. 700 1 $aOLIVEIRA, D. R. 700 1 $aLOMONACO, D. 700 1 $aMAGALHAES, W. L. E. 773 $tBiomass Conversion and Biorefinery, 2023.
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