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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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Registro Completo
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
24/11/2016 |
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Data da última atualização: |
07/06/2023 |
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Tipo da produção científica: |
Capítulo em Livro Técnico-Científico |
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Autoria: |
BLUMENSCHEIN, A.; PRABHU, A. S.; KLUTHCOUSKI, J.; STEINMETZ, S.; PINHEIRO, B. da S.; SILVEIRA FILHO, A. |
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Afiliação: |
ALMIRO BLUMENSCHEIN, CNPAF; ANNE SITARAMA PRABHU, CNPAF; JOAO KLUTHCOUSKI, CNPAF; SILVIO STEINMETZ, CNPAF; BEATRIZ DA SILVEIRA PINHEIRO, CNPAF; AUSTRELINO SILVEIRA FILHO, CNPAF. |
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Título: |
Expanding the environmental coverage of high yield technology. |
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Ano de publicação: |
1985 |
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Fonte/Imprenta: |
In: SMITH, W. H.; CERVANTES, E. P. (ed.). Impact of science on rice. Manila: IRRI, 1985. |
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Páginas: |
p. 263-269. |
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ISBN: |
971-104-144-8 |
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Idioma: |
Inglês |
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Conteúdo: |
Cultivated rice evolved from wild rices found growing along river estuaries. As a taste for cereal developed, cultivation began and migration of the early cultivators accelerated the evolution of cultivated forms adapted to different environments. Today most rice is cultivated under controlled irrigation. In several developing countries it is also grown in a variety of difficult environments where drought, soil fertility, insects, diseases, and mineral toxicity are important constraints. Most international research efforts have been concentrated on irrigated rice. But recently, more attention began to be paid to problems in the more difficult environments. Here we report some aspects of the Brazilian experience on upland rice, which indicates that technology can increase yields and reduce instability, and that under difficult environments, upland rice can be a stable and profitable source of food. Brazil produces about 9 million tonnes of rice yearly; 70% from upland and the rest from irrigated land. Total cultivated area varies from 5 to 6 million hectares. |
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Thesagro: |
Arroz; Doença de planta; Melhoramento Genético Vegetal; Oryza sativa; Praga de planta; Resistência a seca; Sistema de produção. |
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Thesaurus NAL: |
Drought tolerance; Plant breeding; Plant diseases and disorders; Plant pests; Rice. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1056999/1/impactofscience-p284.pdf
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Marc: |
LEADER 02091naa a2200349 a 4500
001 2056999
005 2023-06-07
008 1985 bl uuuu u00u1 u #d
020 $a971-104-144-8
100 1 $aBLUMENSCHEIN, A.
245 $aExpanding the environmental coverage of high yield technology.$h[electronic resource]
260 $c1985
300 $ap. 263-269.
520 $aCultivated rice evolved from wild rices found growing along river estuaries. As a taste for cereal developed, cultivation began and migration of the early cultivators accelerated the evolution of cultivated forms adapted to different environments. Today most rice is cultivated under controlled irrigation. In several developing countries it is also grown in a variety of difficult environments where drought, soil fertility, insects, diseases, and mineral toxicity are important constraints. Most international research efforts have been concentrated on irrigated rice. But recently, more attention began to be paid to problems in the more difficult environments. Here we report some aspects of the Brazilian experience on upland rice, which indicates that technology can increase yields and reduce instability, and that under difficult environments, upland rice can be a stable and profitable source of food. Brazil produces about 9 million tonnes of rice yearly; 70% from upland and the rest from irrigated land. Total cultivated area varies from 5 to 6 million hectares.
650 $aDrought tolerance
650 $aPlant breeding
650 $aPlant diseases and disorders
650 $aPlant pests
650 $aRice
650 $aArroz
650 $aDoença de planta
650 $aMelhoramento Genético Vegetal
650 $aOryza sativa
650 $aPraga de planta
650 $aResistência a seca
650 $aSistema de produção
700 1 $aPRABHU, A. S.
700 1 $aKLUTHCOUSKI, J.
700 1 $aSTEINMETZ, S.
700 1 $aPINHEIRO, B. da S.
700 1 $aSILVEIRA FILHO, A.
773 $tIn: SMITH, W. H.; CERVANTES, E. P. (ed.). Impact of science on rice. Manila: IRRI, 1985.
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Embrapa Arroz e Feijão (CNPAF) |
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