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| Registros recuperados : 174 | |
| 81. |  | CASTRO, K. N. de C.; CANUTO, K. M.; BRITO, E. de S.; COSTA-JÚNIOR, L. M.; ANDRADE, I. M. de; MAGALHÃES, J. A.; BARROS, D. M. A. In vitro efficacy of essential oils with different concentrations of 1,8-cineole against Rhipicephalus (Boophilus) microplus. Brazilian Journal of Veterinary Parasitology. Braz. J. Vet. Parasitol. Jaboticabal, v. 27, n. 2. p. 203-210, apr. june 2018.| Biblioteca(s): Embrapa Meio Norte / UEP-Parnaíba. |
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| 82. | | CASTRO, K. N. de C.; CANUTO, K. M.; BRITO, E. S. de; JÚNIOR, L. M. C.; ANDRADE, I. M.; MAGALHAES, J. A.; BARROS, D. M. A. In vitro efficacy of essential oils with different concentrations of 1,8-cineole against Rhipicephalus (Boophilus) microplus. Brazilian Journal of Veterinary Parasitology, v. 27, n. 2, p. 203-210, 2018.| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 83. | | SOARES, S. M.; DOMINGUES, R.; GASPAR, E. B.; SANTOS, P. A. dos; CANUTO, K. M.; MINHO, A. P.; VIEIRA, M. I. B. In vitro ovicidal effect of a Senecio brasiliensis extract and its fractions on Haemonchus contortus. BMC Veterinary Research, v. 15, n. 99, 25 Mar. 2019. 9 p.| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Pecuária Sudeste; Embrapa Pecuária Sul. |
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| 84. | | SOBREIRA, A. C. M.; PINTO, F. C. L.; FLORENCIO, K. G. D.; WILKE, D. V.; STAATS, C. C.; STREIT, R. A. S.; FREIRE, F. das C. O.; PESSOA, O. D. L.; SILVA, A. E. T.; CANUTO, K. M. Endophytic fungus Pseudofusicoccum stromaticum produces cyclopeptides and plant-related bioactive rotenoids. RSC Advances, v. 8, p. 35575-35586, 2018.| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 85. | | SERPA, J. de F.; SILVA, J. de S.; REIS, C. L. B.; MICOLI, L.; SILVA, L. M. A. e; CANUTO, K. M.; MACEDO, A. C. de; ROCHA, M. V. P. Extraction and characterization of lignins from cashew apple bagasse obtained by different treatments. Biomass & Bioenergy, v. 141, art. no. 105728, 2020.| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 86. | | FERREIRA GOMES, C. C.; OLIVEIRA, L. DE S.; RODRIGUES, D. C.; RIBEIRO, P. R. V.; CANUTO, K. M.; DUARTE, A. S. G.; EÇA, K. S.; FIGUEIREDO, R. W. DE. Evidence for antioxidant and anti-inflammatory potential of mango (Mangifera indica L.) in naproxen-induced gastric lesions in rat. Journal of Food Biochemistry, p.e13880-e13880, 2021| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 87. | | SILVA, F. A. N.; SILVA, A. A.; FERNANDES, N. S.; RODRIGUES, T. H. S.; CANUTO, K. M.; NASCIMENTO, R. F.; BRITO, E. S. de; ARAGAO, F. A. S. de; FREITAS, B. M.; ZOCOLO, G. J. Evaluation of headspace solid-phase microextraction gas chromatography - mass spectrometry for the characterization of volatile organic compounds from melon (Cucumis melo L.) flowers. Chromatographia, v. 81, p. 1231-1239, 2018.| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 89. | | PONZZES-GOMES, C. M. P. B. S.; ROCHA, K. K. R; SOUZA, J. F. de; MELO, M. de A.; PEREIRA, G. E.; CANUTO, K. M.; QUEROL, A.; ROSA, C. A. Selection and evaluation of Saccharomyces cerevisiae wild strains isolated from fermented must of grapes produced in the São Francisco Valley, Brazil. In: INTERNATIONAL SYMPOSIUM ON TROPICAL WINES, 5., 2016, Petrolina. Book of abstracts... Petrolina: Embrapa Semiárido, 2016. p. 59.| Biblioteca(s): Embrapa Semiárido; Embrapa Uva e Vinho. |
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| 90. | | LOPES, L. G.; SILVA, M. H.; FIGUEIREDO, A.; CANUTO, K. M.; BRITO, E. S. de; RIBEIRO, P. R. V.; SOUZA, A. S. Q.; BARIONI JUNIOR, W.; ESTEVES, S. N.; CHAGAS, A. C. de S. The intake of dry cashew apple fiber reduced fecal egg counts in Haemonchus contortus-infected sheep. Experimental Parasitology, v. 195, p. 38-43, 2018.| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Pecuária Sudeste. |
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| 91. | | MATOS, T. K. B.; GUEDES, J. A. C.; ALVES FILHO, E. G.; LUZ, L. R.; LOPES, G. S.; NASCIMENTO, R. F. DO; SOUSA, J. A. de; CANUTO, K. M.; BRITO, E. S. de; DIAS, N. da S.; ZOCOLO, G. J. Integrated UPLC-HRMS, Chemometric Tools, and Metabolomic Analysis of Forage Palm (Opuntia spp. and Nopalea spp.) to Define Biomarkers Associated with Non-Susceptibility to Carmine Cochineal (Dactylopius opuntiae). Journal of the Brazilian Chemical Society, v. 32, n. 8, p. 1617-1627, 2021.| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 92. | | ANHOLETO, L. A.; BRANCAGLION, G. A.; SANTOS, D. M. dos; KAPRITCHKOFF, R. T. I.; CASTRO, K. N. de C.; CANUTO, K. M.; RODRIGUES, A. F. R.; CORREA, D. S.; PASTRE, J. C.; CHAGAS, A. C. de S. Atividade acaricida do derivado sintético do espilantol contra carrapatos de importância médica e veterinária. In: JORNADA CIENTÍFICA - EMBRAPA SÃO CARLOS, 15., 2023, São Carlos, SP. Anais... São Carlos: Embrapa Pecuária Sudeste: Embrapa Instrumentação, 2023. 43 p.| Biblioteca(s): Embrapa Gado de Leite; Embrapa Instrumentação; Embrapa Milho e Sorgo. |
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| 93. | | ANHOLETO, A. L.; BRANCAGLION, A. G.; SANTOS, M. D. DOS.; KAPRITCHKOFF, I. T. R.; CASTRO, K. N. de C.; CANUTO, K. M.; RODRIGUES, R. A. F.; CORREA, D. S.; PASTRE, C. J.; CHAGAS, A. C. de S. Atividade acaricida do derivado sintético do espilantol contra carrapatos de importância médica e veterinária. In: JORNADA CIENTÍFICA - EMBRAPA SÃO CARLOS, 15., 2023, São Carlos, SP. Anais... São Carlos: Embrapa Pecuária Sudeste: Embrapa Instrumentação, 2023. p. 43.| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Pecuária Sudeste. |
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| 94. | | DIAS, N. da S.; MATEUS, A. E.; MACIEL, G. P. DE S.; SARAIVA, W. V. A.; RODRIGUES, T. H. S.; SILVA, C. S. B. D.; VIDAL NETO, F. das C.; FANCELLI, M.; CANUTO, K. M.; ZOCOLO, G. J. Atratividade de Aleurodicus cocois a compostos voláteis liberados por folhas de cajueiro-anão. Fortaleza: Embrapa Agroindústria Tropical, 2021. (Embrapa Agroindústria Tropical. Boletim de pesquisa e desenvolvimento, 218).| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Algodão; Embrapa Mandioca e Fruticultura. |
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| 95. | | SILVA, A. B. DA; PINTO, F. DAS C. L.; LOTUFO, L. V. COSTA; COSTA, W. S.; AYALA, A. P.; CANUTO, K. M.; BARROS, A. B.; ARAÚJO, A. J.; FILHO, J. D. B. M.; PESSOA, O. D. L. 4-Hydroxy-pyran-2-one and 3-hydroxy-N-methyl-2-oxindole derivatives of Salinispora arenicola from Brazilian marine sediments. Fitoterapia, New York, v. 138, artigo 104357, 5 p., Oct. 2019.| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 96. | | 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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| 97. | | 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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| 98. | | CASTRO, K. N. de C.; COSTA-JÚNIOR, L. M.; LIMA, D. F.; CANUTO, K. M.; BRITO, E. S. de; ANDRADE, I. M. de; TEODORO, M. S.; OIRAM-FILHO, F. O.; SANTOS, R. C. dos; MAYO, S. J. Acaricidal activity of cashew nut shell liquid associated with essential oils from Cordia verbenacea and Psidium guajava on Rhipicephalus microplus. Journal of Essential oil Research, v. 31, n. 4, p. 297-304, 2019.| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Meio-Norte. |
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| 99. | | ANHOLETO, L. A.; BRANCAGLION, G. A.; SANTOS, D. M. DOS; KAPRITCHKOFF, R. T. I.; CASTRO, K. N. de C.; CANUTO, K. M.; RODRIGUES, R. A. F.; CORREA, D. S.; CHAGAS, A. C. de S.; PASTRE, J. C. Acaricidal activity of synthetic spilanthol derivative against ticks of medical and veterinary importance. Veterinary Parasitology, v. 327, Apr. 2024, 110137. 9 p.| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Gado de Leite; Embrapa Instrumentação; Embrapa Pecuária Sudeste. |
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| Registros recuperados : 174 | |
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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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Embrapa Algodão (CNPA) |
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