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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
17/05/2024 |
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Data da última atualização: |
17/05/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
GENTIL, M.; MAGALHAES, W. L. E.; MARTINS, T. R.; MALLMANN, A. S.; MALUCELLI, L. C.; COLDEBELLA, R.; PEDRAZZI, C. |
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Afiliação: |
MARINA GENTIL, UNIVERSIDADE FEDERAL DE SANTA MARIA; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF; THIAGO RODRIGUES MARTINS, UNIVERSIDADE FEDERAL DE SANTA MARIA; ANDERSON STOFFELS MALLMANN, TANAC; LUCCA CENTA MALUCELLI; RODRIGO COLDEBELLA, UNIVERSIDADE FEDERAL DE SANTA MARIA; CRISTIANE PEDRAZZI, UNIVERSIDADE FEDERAL DE SANTA MARIA. |
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Título: |
Influence of residual lignin on Acacia mearnsii De Wild nanofibrillated cellulose suspensions and films. |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
Cellulose, v. 30, n. 17, p. 10867-10877, 2023. |
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DOI: |
https://doi.org/10.1007/s10570-023-05546-5 |
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Idioma: |
Português |
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Conteúdo: |
Studies on plant-derived nanocellulose are mainly carried out with lignin-free materials. However, lignocellulosic materials can be used as an alternative raw material, mainly due to their low cost and low environmental impact. This work aimed to study and compare the influence of residual lignin on the nanofibrillation process, on the properties of the nanofibrils and the films formed from the cel- lulose nanofibrils of Acacia mearnsii De Wild. The cellulosic pulp was subjected to bleaching to remove the lignin and obtain the bleached pulp. Bleach and unbleached pulps were subjected to mechanical defi- brillation to obtain cellulose nanofibrils. The effects of defibrillation and residual lignin content were ana- lyzed by characterizing the suspensions and nanocel- lulose films formed from this material. In addition, an energetic study of the production process of dif- ferent cellulose nanofibrils was carried out, consid- ering the different levels of residual lignin present in the material. The results demonstrated that the residual lignin presence preserved the thermal prop- erties and provided changes in the morphology of the films, the suspensions showed colloidal stability from pH 5.0 (between |25| and |30| kV), the increase of the lignin content in the pulp caused a slight expres- sive improvement in the antioxidant activity and a decrease in the suspension viscosities, which fitted the Herschel–Bulkley model well (R2 > 0.98). The mechanical properties of the films [127 MPa (NBR) and 75 MPa (N16)] and the energy consumption to produce nanofibrils [0.324 kWh (NBR) and 0.180 kWh (N16)] showed significant differences, point- ing to the influence of residual lignin present in the materials. MenosStudies on plant-derived nanocellulose are mainly carried out with lignin-free materials. However, lignocellulosic materials can be used as an alternative raw material, mainly due to their low cost and low environmental impact. This work aimed to study and compare the influence of residual lignin on the nanofibrillation process, on the properties of the nanofibrils and the films formed from the cel- lulose nanofibrils of Acacia mearnsii De Wild. The cellulosic pulp was subjected to bleaching to remove the lignin and obtain the bleached pulp. Bleach and unbleached pulps were subjected to mechanical defi- brillation to obtain cellulose nanofibrils. The effects of defibrillation and residual lignin content were ana- lyzed by characterizing the suspensions and nanocel- lulose films formed from this material. In addition, an energetic study of the production process of dif- ferent cellulose nanofibrils was carried out, consid- ering the different levels of residual lignin present in the material. The results demonstrated that the residual lignin presence preserved the thermal prop- erties and provided changes in the morphology of the films, the suspensions showed colloidal stability from pH 5.0 (between |25| and |30| kV), the increase of the lignin content in the pulp caused a slight expres- sive improvement in the antioxidant activity and a decrease in the suspension viscosities, which fitted the Herschel–Bulkley model well (R2 > 0.98). The mechanical properties of the films [12... Mostrar Tudo |
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Palavras-Chave: |
Cellulose nanofilms; Kappa number; Nanocellulose; Nanocelulose. |
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Thesagro: |
Acácia Mearnsii; Celulose. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 02557naa a2200277 a 4500
001 2164308
005 2024-05-17
008 2023 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/s10570-023-05546-5$2DOI
100 1 $aGENTIL, M.
245 $aInfluence of residual lignin on Acacia mearnsii De Wild nanofibrillated cellulose suspensions and films.$h[electronic resource]
260 $c2023
520 $aStudies on plant-derived nanocellulose are mainly carried out with lignin-free materials. However, lignocellulosic materials can be used as an alternative raw material, mainly due to their low cost and low environmental impact. This work aimed to study and compare the influence of residual lignin on the nanofibrillation process, on the properties of the nanofibrils and the films formed from the cel- lulose nanofibrils of Acacia mearnsii De Wild. The cellulosic pulp was subjected to bleaching to remove the lignin and obtain the bleached pulp. Bleach and unbleached pulps were subjected to mechanical defi- brillation to obtain cellulose nanofibrils. The effects of defibrillation and residual lignin content were ana- lyzed by characterizing the suspensions and nanocel- lulose films formed from this material. In addition, an energetic study of the production process of dif- ferent cellulose nanofibrils was carried out, consid- ering the different levels of residual lignin present in the material. The results demonstrated that the residual lignin presence preserved the thermal prop- erties and provided changes in the morphology of the films, the suspensions showed colloidal stability from pH 5.0 (between |25| and |30| kV), the increase of the lignin content in the pulp caused a slight expres- sive improvement in the antioxidant activity and a decrease in the suspension viscosities, which fitted the Herschel–Bulkley model well (R2 > 0.98). The mechanical properties of the films [127 MPa (NBR) and 75 MPa (N16)] and the energy consumption to produce nanofibrils [0.324 kWh (NBR) and 0.180 kWh (N16)] showed significant differences, point- ing to the influence of residual lignin present in the materials.
650 $aAcácia Mearnsii
650 $aCelulose
653 $aCellulose nanofilms
653 $aKappa number
653 $aNanocellulose
653 $aNanocelulose
700 1 $aMAGALHAES, W. L. E.
700 1 $aMARTINS, T. R.
700 1 $aMALLMANN, A. S.
700 1 $aMALUCELLI, L. C.
700 1 $aCOLDEBELLA, R.
700 1 $aPEDRAZZI, C.
773 $tCellulose$gv. 30, n. 17, p. 10867-10877, 2023.
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Embrapa Florestas (CNPF) |
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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
08/12/2015 |
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Data da última atualização: |
08/12/2015 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
OLIVEIRA, S. P. de; MATSUURA, M. I. da S. F.; SENA, M. G. C. de; MIRANDA, P. C.; SANTANA, F. S.; FERREIRA, G. F.; CALDAS, R. C. |
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Afiliação: |
SILVANA PEDROSO DE OLIVEIRA, Embrapa Agroindústria de Alimentos; MARILIA IEDA DA S F MATSUURA, CNPMA; MARIA DAS GRAÇAS CARNEIRO DE SENA, Embrapa Mandioca Fruticultura; PRISCILA COUTINHO MIRANDA; FLÁVIO SÍLVIO DE SANTANA; GLEIZE FIAES FERREIRA; RANULFO CORRÊA CALDAS. |
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Título: |
Consumo alimentar de famílias do semi-árido baiano. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
In: CONGRESO LATINOAMERICANO DE NUTRICION, 14., 2006, Florianópolis,SC. [Anais...] Florianópolis, SC: CLN, 2006. |
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Idioma: |
Português |
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Thesagro: |
Segurança alimentar. |
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Categoria do assunto: |
Q Alimentos e Nutrição Humana |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/135141/1/2006RA-085.pdf
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Marc: |
LEADER 00616nam a2200181 a 4500
001 2030998
005 2015-12-08
008 2006 bl uuuu u00u1 u #d
100 1 $aOLIVEIRA, S. P. de
245 $aConsumo alimentar de famílias do semi-árido baiano.$h[electronic resource]
260 $aIn: CONGRESO LATINOAMERICANO DE NUTRICION, 14., 2006, Florianópolis,SC. [Anais...] Florianópolis, SC: CLN$c2006
650 $aSegurança alimentar
700 1 $aMATSUURA, M. I. da S. F.
700 1 $aSENA, M. G. C. de
700 1 $aMIRANDA, P. C.
700 1 $aSANTANA, F. S.
700 1 $aFERREIRA, G. F.
700 1 $aCALDAS, R. C.
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