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| Registros recuperados : 120 | |
| 61. |  | LIMA, J. de F.; SILVA, L. M. A. da; SILVA, T. C. da; GARCIA, J. da S.; PEREIRA, I. da S.; AMARAL, K. D. S. Reproductive aspects of Macrobrachium amazonicum (Decapoda: Palaemonidae) in the State of Amapá, Amazon River mouth. Acta Amazonica, Manaus, v. 44, n. 2, p. 245-254, June 2014.| Biblioteca(s): Embrapa Amapá. |
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| 62. | | CASTRO NETO, M. D.; SANTOS, G. R.; DIAS NETO, J. J.; RANGEL, P. H. N.; SILVA, L. M. A.; RIBEIRO, F. F. Resistências de genótipos de arroz de terras altas à doenças no sul do Estado do Tocantins. Tropical Plant Pathology, v. 33, p. S 209, ago. 2008. Suplemento. ref. MEL-043. Edição dos Resumos do XLI Congresso Brasileiro de Fitopatologia, Belo Horizonte, MG, ago. 2008.| Biblioteca(s): Embrapa Arroz e Feijão. |
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| 63. | | SANTOS, A. R. B; DIAS, L. R. C.; SILVA, P. H. S. da; LARANJEIRA, D.; ATHAYDE SOBRINHO, C.; SILVA, L. M. A. da. Seed treatment with essential oils to control Sclerotium rolfsii Sacc. DELOS: Desarrollo Local Sostenible, Curitiba, v.17, n. 55, p. 01-17, 2024.| Biblioteca(s): Embrapa Meio-Norte. |
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| 64. | | SOARES, M. V. L.; ALVES FILHO, E. G.; SILVA, L. M. A. e; NOVOTNY, E. H.; CANUTO, K. M.; WURLITZER, N. J.; NARAIN, N.; BRITO, E. S. de. Tracking thermal degradation on passion fruit juice through Nuclear Magnetic Resonance and chemometrics. Food Chemistry, v. 219, p. 1-6, 2017.| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Solos. |
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| 66. | | DIAS NETO, J. J.; SANTOS, G. R.; SILVA, L. M. A.; RANGEL, P. H. N.; FERREIRA, M. E.; CUNHA, A. C. F.; CANJÃO, E. R.; CASTRO NETO, M. D. Agressividade de raças de Pyricularia grisea em Série Internacional de Diferenciadoras no Estado do Tocantins. In. CONGRESSO BRASILEIRO DE FITOPATOLOGIA, 41., 2008, Belo Horizonte. [Resumos...]. Tropical Plant Pathology, v. 33, 2008. Suplemento. Resumo EPI-054. p. S186.| Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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| 67. | | DIAS NETO, J. J.; SANTOS, G. R.; SILVA, L. M. A.; RANGEL, P. H. N.; FERREIRA, M. E.; CUNHA, A. C. F.; CANJÃO, E. R.; CASTRO NETO, M. D. Agressividade de raças de Pyricularia grisea em Série Internacional de Diferenciadoras no Estado do Tocantins. Tropical Plant Pathology, v. 33, p. S 186, ago. 2008. Suplemento. ref. EPI-054. Edição dos Resumos do XLI Congresso Brasileiro de Fitopatologia, Belo Horizonte, MG, ago. 2008.| Biblioteca(s): Embrapa Arroz e Feijão. |
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| 68. | | ALVES FILHO, E. DE G.; SILVA, L. M. A. e; RIBEIRO, P. R. V.; BRITO, E. S. de; ZOCOLO, G. J.; LEAO, P. C. de S.; BIASOTO, A. C. T.; QUINTELA, A. L.; LARSEN, F. H.; CANUTO, K. M. 1 H NMR and LC-MS-based metabolomic approach for evaluation of the seasonality and viticultural practices in wines from São Francisco River Valley, a Brazilian semi-arid region. Food Chemistry, London, v. 289, p. 558-567, 2019.| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Semiárido. |
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| 69. | | ALVES FILHO, E. G.; SILVA, L. M. A. e; LIMA, T. O.; RIBEIRO, P. R. V.; VIDAL, C. S.; CARVALHO, E. S. S.; DRUZIAN, J. I.; BIASOTO, A. C. T.; CANUTO, K. M. 1H NMR and UPLC-HRMS-based metabolomic approach for evaluation of the grape maturity and maceration time of Touriga Nacional wines and their correlation with the chemical stability. Food Chemistry, v. 382, 132359, 2022.| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Semiárido. |
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| 70. | | SARAIVA, W. V. A.; SILVA, R. R. da; SILVA, L. M. A.; AMARAL, E. A. do; SOUSA NETO, E. P. de; MACIEL, G. P. de S.; MELO, J. W. da S.; DIAS, N. da S. Acarofauna plantícola associada ao cajueiro em São Luís, MA. Fortaleza : Embrapa Agroindústria Tropical, 2023. (Embrapa Agroindústria Tropical. Boletim de pesquisa e desenvolvimento, 242). ODS 12.| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 71. | | VASCONCELOS, N. F.; FEITOSA, J. P. DE A.; ANDRADE, FÁBIA KARINE; MIRANDA, M. A. R.; SASAKI, J. M.; MORAIS, J. P. S.; SILVA, L. M. A. e; CANUTO, K. M.; ROSA, M. de F. Chemically modified cellulose nanocrystals as polyanion for preparation of polyelectrolyte complex. Cellulose, Dordrecht, v. 26, n. 3, p. 1725-1746, Feb. 2019.| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 72. | | 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. Chemically modified cellulose nanocrystals as polyanion for preparation of polyelectrolyte complex. Cellulose, v. 26, n. 3, p. 1725-1746, February 2019.| Biblioteca(s): Embrapa Algodão. |
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| 73. | | BENTO, J. A. P.; RIBEIRO, P. R. V.; SILVA, L. M. A. e; ALVES FILHO, E. G.; BASSINELLO, P. Z.; BRITO, E. S. de; CALIARI, M.; SOARES JÚNIOR, M. S. Chemical profile of colorful bean (Phaseolus vulgaris L) flours: changes influenced by the cooking method. Food Chemistry, Food Chemistry, v. 356, 129718, Sept. 2021.| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Arroz e Feijão. |
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| 74. | | MAIA, I. R. O.; TREVISAN, M. T. S.; SILVA, M. G. V.; KLIKA, K. D.; BRITO, E. S. de; SILVA, L. M. A. e; PINTO, F. C. L.; BREUER, A.; OWEN, R. W. Characterization and Quantitation of Polyphenolic Compounds in Senna splendida from the Northeast of Brazil. Natural Product Communications, v. 13, n. 6, p. 707-712, 2018.| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 75. | | CUNHA, A. G.; ALVES FILHO, E. G.; SILVA, L. M. A. e; RIBEIRO, P. R. V.; RODRIGUES, T. H. S.; BRITO, E. S. de; MIRANDA, M. R. A. de. Chemical composition of thermally processed coconut water evaluated by GC-MS, UPLC-HRMS, and NMR. Food Chemistry, 324, art. no. 126874, 2020.| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 76. | | OLIVEIRA, T. I. S.; ROSA, M. de F.; RIDOUT, M. J.; CROSS, K.; BRITO, E. S. de; SILVA, L. M. A. e; MAZZETTO, S. E.; WALDRON, K. W.; AZEREDO, H. M. C. de. Bionanocomposite films based on polysaccharides from banana peels. International Journal of Biological Macromolecules, v. 101, p. 1-8, 2017.| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 77. | | SILVA, M. F. S.; SILVA, F. A. N.; SOUSA, A. D.; SILVA, L. M. A. e; RIBEIRO, P. R. V.; CANUTO, K. M.; BRITO, E. S. de; PESSOA, C. do Ó; ZOCOLO, G. J. Metodologia baseada em extração em fase sólida (EFS) como parte da estratégia de desreplicação para prospecção de moléculas com atividade citotóxica em Phyllanthus spp. Fortaleza: Embrapa Agroindústria Tropical, 2019. 8 p. (Embrapa Agroindústria Tropical. Comunicado técnico, 257)| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 78. | | SILVA, L. M. A. e; ALVES FILHO, E. G.; RODRIGUES, T. H. S.; LOUREDO, F. J. C.; ZOCOLO, G. J.; CANUTO, K. M.; MIKICH, S. B.; LIEBSCH, D.; ALMEIDA, A. DE; BRITO, E. S. de. Metabolomic Profiling of Phloem Sap from Different Pine Species and Implications on Black Capuchin. Journal of Chemical Ecology, 48, 660?669, 2022.| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Alimentos e Territórios. |
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| 79. | | FRANCA, L. G. DA; ALVES FILHO, E.; RIBEIRO, L. B.; EVANGELISTA, J. S. B.; SILVA, L. M. A. e; SOUZA, P. A. DE; CANUTO, K. M.; ARAGAO, F. A. S. de. Metabolomic profling of acerola clones according to the ripening stage. Journal of Food Measurement and Characterization, v. 15, n. 1, p. 416-424, 2021.| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 80. | | ALVES FILHO, E.; SILVA, L. M. A. e; LIMA, Y.; RIBEIRO, P. R. V.; SILVA, E. de O.; ZOCOLO, G. J.; CANUTO, K. M.; MORAIS, S. M. DE; CASTRO, A. C. R. de; BRITO, E. S. de. Metabolomic variability of different genotypes of cashew by LC-Ms and correlation with near-infrared spectroscopy as a tool for fast phenotyping. Metabolites, Basel, v. 9, n. 6, artigo 121, 19 p. June 2019.| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| Registros recuperados : 120 | |
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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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