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| Registros recuperados : 28 | |
| 21. |  | ARAÚJO, R. A. de; NEIVA, J. N. M.; POMPEU, R. C. F. F.; CÂNDIDO, M. J. D.; ROGERIO, M. C. P.; LUCAS, R. C.; MARANHÃO, S. R.; FONTINELE, R. G.; EGITO, A. S. do. Feeding behavior and physiological parameters of rearing goats fed diets containing detoxified castor cake. Semina: Ciências Agrárias, Londrina, v. 39, n. 5, p. 2247-2260, set./out. 2018.| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 22. | | CASTRO, V. C. G.; SANTOS, G. R.; FERNANDES, P. C. C.; MARTORANO, L. G.; LUCAS, R. C.; BARROS, K. K. da S.; MONTEIRO, S. do N.; NAHUM, B. S.; ARAÚJO, G. S. Fração sólida da digesta de animais suplementados com farelo da palma de óleo e possíveis efeitos de variáveis agrometeorológicas. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA PARA O PROGRESSO DA CIÊNCIA, 67., 2015, São Carlos, SP. Resumos... São Paulo: SBPC, 2015.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 23. | | ARAUJO, R. A.; SILVA, L. N. C.; NEIVA, J. N. M.; POMPEU, R. C. F. F.; ROGERIO, M. C. P.; LUCAS, R. C.; CÂNDIDO, M. J. D.; AVILA, F. G. Funcionalidade hepática de cabritas Saanen e Anglo-nubiana alimentadas com torta de mamona. In: CONGRESSO NORDESTINO DE PRODUÇÃO ANIMAL, 12., 2017, Juazeiro, BA. Construindo pontes entre o ensino, a pesquisa e a extensão: anais. Petrolina: Univasf: Embrapa Semiárido: Instituto Federal de Educação, Ciência e Tecnologia, Sertão de Pernambuco, 2017. 1 CD-ROM. p. 1574-1576.| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 24. | | PEREIRA, P. L.; ARAÚJO, R. A. de; NEIVA, J. N. M.; POMPEU, R. C. F. F.; ROGERIO, M. C. P.; LUCAS, R. C.; CÂNDIDO, M. J. D.; ÁVILA, F. G. Consumo de matéria seca e demais nutrientes por cabritas leiteiras alimentadas com torta de mamona destoxificada na fase de crescimento. In: CONGRESSO NORDESTINO DE PRODUÇÃO ANIMAL, 12., 2017, Juazeiro, BA. Construindo pontes entre o ensino, a pesquisa e a extensão: anais. Petrolina: Univasf: Embrapa Semiárido: Instituto Federal de Educação, Ciência e Tecnologia, Sertão de Pernambuco, 2017. 1 CD-ROM. p. 900-902.| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 25. | | PEREIRA, P. L.; ARAÚJO, R. A. de; NEIVA, J. N. M.; POMPEU, R. C. F. F.; POMPEU, F. F.; ROGERIO, M. C. P.; LUCAS, R. C.; CÂNDIDO, M. J. D.; ÁVILA, F. G. Comportamento ingestivo de cabritas consumindo dietas contendo torta de mamona destoxificada. In: CONGRESSO NORDESTINO DE PRODUÇÃO ANIMAL, 12., 2017, Juazeiro, BA. Construindo pontes entre o ensino, a pesquisa e a extensão: anais. Petrolina: Univasf: Embrapa Semiárido: Instituto Federal de Educação, Ciência e Tecnologia, Sertão de Pernambuco, 2017. 1 CD-ROM. p. 891-893.| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 26. | | ARAÚJO, R. A.; NEIVA, J. N. M.; ROGERIO, M. C. P.; CÂNDIDO, M. J. D.; EGITO, A. S. do; PEREIRA, P. L.; LUCAS, R. C.; POMPEU, R. C. F. F. Destoxificação e perfil nutricional da torta de mamona destoxificada por diferentes soluções alcalinas. Arquivo Brasileiro de Medicina Veterinária e Zootecnia, v. 72, n. 5, p. 1947-1958, set./out. 2020.| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 27. | | POMPEU, R. C. F. F.; ARAÚJO, R. A. de; LUCAS, R. C.; NEIVA, J. N. M.; EGITO, A. S. do; CÂNDIDO, M. J. D.; ROGERIO, M. C. P.; PEREIRA, P. L.; XIMENES, L. V.; GALVANI, D. B.; SALLES, H. O. Destoxificação da torta de mamona por processos químicos alcalinos em escala semi-industrial e seu uso na alimentação de pequenos ruminantes. Sobral: Embrapa Caprinos e Ovinos, 2019. 31 p. (Embrapa Caprinos e Ovinos. Boletim de Pesquisa e Desenvolvimento, 9).| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 28. | | VITCOSQUE, G. L.; RIBEIRO, L. F. C.; LUCAS, R. C. de; SILVA, T. M. da; RIBEIRO, L. F.; DAMASIO, A. R. de L.; FARINAS, C. S.; GONCALVES, A. Z. L.; SEGATO, F.; BUCKERIDGE, M. S.; JORGE, J. A.; POLIZELI, M. de L. T. M. The functional properties of a xyloglucanase (GH12) of Aspergillus terreus expressed in Aspergillus nidulans may increase performance of biomass degradation. Applied microbiology and biotechnology, [S. ], v. 100, n. 21, p. 9133-9144, 2016.| Biblioteca(s): Embrapa Instrumentação. |
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| Registros recuperados : 28 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Algodão. |
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Data corrente: |
14/01/2020 |
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Data da última atualização: |
20/01/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
VASCONCELOS, N. F.; FEITOSA, J. P. A.; ANDRADE, F. K.; MIRANDA, M. A. R.; SASAKI, J. M.; MORAIS, J. P. S.; SILVA, L. M. A. e; CANUTO, K. M.; ROSA, M. de F. |
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Afiliação: |
Niédja Fittipaldi Vasconcelos, Universidade Federal do Ceará - UFC/Departamento de Química; Judith Pessoa Andrade Feitosa, Universidade Federal do Ceará - UFC/Departamento de Química; Fábia Karine Andrade, Universidade Federal do Ceará - UFC/Departamento de Engenharia Química; Marcus Aurélio Ribeiro Miranda, Universidade Federal do Ceará - UFC/Departamento de Física; José Marcos Sasaki, Universidade Federal do Ceará - UFC/Departamento de Física; JOAO PAULO SARAIVA MORAIS, CNPA; LORENA MARA ALEXANDRE E SILVA, CNPAT; KIRLEY MARQUES CANUTO, CNPAT; MORSYLEIDE DE FREITAS ROSA, CNPAT. |
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Título: |
Chemically modified cellulose nanocrystals as polyanion for preparation of polyelectrolyte complex. |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
Cellulose, v. 26, n. 3, p. 1725-1746, February 2019. |
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Idioma: |
Inglês |
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Conteúdo: |
Bacterial cellulose nanocrystals (BCNCs) have hydrophilic surfaces due to hydroxyl groups but are water-insoluble. The carboxymethylation improves the solubility of cellulose in polar media through the insertion of carboxymethyl groups. This study aims to evaluate the use of two different alcoholic solvents in the carboxymethylation reaction of BCNCs: ethanol and isopropanol. BCNCs were obtained under two hydrolysis conditions: sulfuric acid (BCNC-S) and combination of sulfuric and hydrochloric acids (BCNC-S/Cl). Two techniques (NMR and titration) were used to determine the degree of substitution (DS) values. Carboxymethylation of BCNC-S/Cl led to high DS compared to BCNC-S and the use of isopropanol promoted an even greater DS. The thermal properties were not affected after the chemical modification. However, functionalization provided an increase in the negative charge density at the surface of nanostructures and a change in the crystal structure (cellulose type Ia for amorphous), making this material a potential polyanion for the synthesis of polyelectrolyte complexes (PECs). The micrographs showed that the nanocrystals became soluble after carboxymethylation. Carboxymethylated bacterial cellulose nanocrystals hydrolyzed through the mixture of inorganic acids and modified using isopropanol (CBCNC-S/Cl-IPA) was a suitable polyanion to produce PECs with chitosan. The PECs produced had particle size ranging from 276 to 588 nm and zeta potential ranging from - 24.3 to + 39.0 mV. MenosBacterial cellulose nanocrystals (BCNCs) have hydrophilic surfaces due to hydroxyl groups but are water-insoluble. The carboxymethylation improves the solubility of cellulose in polar media through the insertion of carboxymethyl groups. This study aims to evaluate the use of two different alcoholic solvents in the carboxymethylation reaction of BCNCs: ethanol and isopropanol. BCNCs were obtained under two hydrolysis conditions: sulfuric acid (BCNC-S) and combination of sulfuric and hydrochloric acids (BCNC-S/Cl). Two techniques (NMR and titration) were used to determine the degree of substitution (DS) values. Carboxymethylation of BCNC-S/Cl led to high DS compared to BCNC-S and the use of isopropanol promoted an even greater DS. The thermal properties were not affected after the chemical modification. However, functionalization provided an increase in the negative charge density at the surface of nanostructures and a change in the crystal structure (cellulose type Ia for amorphous), making this material a potential polyanion for the synthesis of polyelectrolyte complexes (PECs). The micrographs showed that the nanocrystals became soluble after carboxymethylation. Carboxymethylated bacterial cellulose nanocrystals hydrolyzed through the mixture of inorganic acids and modified using isopropanol (CBCNC-S/Cl-IPA) was a suitable polyanion to produce PECs with chitosan. The PECs produced had particle size ranging from 276 to 588 nm and zeta potential ranging from - 24.3 to + 39.0 ... Mostrar Tudo |
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Palavras-Chave: |
Carboxymethylation; Polyelectrolytic complexes. |
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Thesaurus NAL: |
Chitosan; Hydrolysis; Nanocrystals. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/208702/1/Chemically-modified-cellulose.pdf
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Marc: |
LEADER 02321naa a2200277 a 4500
001 2118682
005 2020-01-20
008 2019 bl uuuu u00u1 u #d
100 1 $aVASCONCELOS, N. F.
245 $aChemically modified cellulose nanocrystals as polyanion for preparation of polyelectrolyte complex.$h[electronic resource]
260 $c2019
520 $aBacterial cellulose nanocrystals (BCNCs) have hydrophilic surfaces due to hydroxyl groups but are water-insoluble. The carboxymethylation improves the solubility of cellulose in polar media through the insertion of carboxymethyl groups. This study aims to evaluate the use of two different alcoholic solvents in the carboxymethylation reaction of BCNCs: ethanol and isopropanol. BCNCs were obtained under two hydrolysis conditions: sulfuric acid (BCNC-S) and combination of sulfuric and hydrochloric acids (BCNC-S/Cl). Two techniques (NMR and titration) were used to determine the degree of substitution (DS) values. Carboxymethylation of BCNC-S/Cl led to high DS compared to BCNC-S and the use of isopropanol promoted an even greater DS. The thermal properties were not affected after the chemical modification. However, functionalization provided an increase in the negative charge density at the surface of nanostructures and a change in the crystal structure (cellulose type Ia for amorphous), making this material a potential polyanion for the synthesis of polyelectrolyte complexes (PECs). The micrographs showed that the nanocrystals became soluble after carboxymethylation. Carboxymethylated bacterial cellulose nanocrystals hydrolyzed through the mixture of inorganic acids and modified using isopropanol (CBCNC-S/Cl-IPA) was a suitable polyanion to produce PECs with chitosan. The PECs produced had particle size ranging from 276 to 588 nm and zeta potential ranging from - 24.3 to + 39.0 mV.
650 $aChitosan
650 $aHydrolysis
650 $aNanocrystals
653 $aCarboxymethylation
653 $aPolyelectrolytic complexes
700 1 $aFEITOSA, J. P. A.
700 1 $aANDRADE, F. K.
700 1 $aMIRANDA, M. A. R.
700 1 $aSASAKI, J. M.
700 1 $aMORAIS, J. P. S.
700 1 $aSILVA, L. M. A. e
700 1 $aCANUTO, K. M.
700 1 $aROSA, M. de F.
773 $tCellulose$gv. 26, n. 3, p. 1725-1746, February 2019.
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