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| Registros recuperados : 174 | |
| 102. |  | LEAL, L. K. A. M.; NOBRE JÚNIOR, H. V.; CUNHA, G. M. A.; MORAES, M. O.; PESSOA, C.; OLIVEIRA, R. A.; SILVEIRA, E. R.; CANUTO, K. M.; VIANA, G. S. B. Amburoside A, a glucoside from Amburana cearensis, protects mesencephalic cells against 6-hydroxydopamine-induced neurotoxicity. Neuroscience Letters, v. 388, p. 86-90, 2005.| Biblioteca(s): Embrapa Semiárido. |
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| 103. | | SILVA, A. K. O.; PINTO, F. C. L.; CANUTO, K. M.; BRAZ-FILHO, R.; SILVA, R. A. C.; SANTOS, F. A.; MONTEIRO, N. K. V.; SILVEIRA, E. R.; PESSOA, O. D. L. Anti-inflammatory meroterpenoids of cordia glazioviana (boraginaceae). Journal of the Brazilian Chemical Society, v. 32 n. 7, p. 1424-1434, 2021.| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 104. | | SOUSA, A. K. A. de; FOGACA, F. H. dos S.; ARAUJO, T. D. S.; CASTRO, K. N. de C.; PEREIRA, A. M. L.; CANUTO, K. M.; BRITO, E. S. de; MAI, M. G.; MAGALHAES, J. A. Effect of Alpinia zerumbet essential oil on the shelf life of tambaqui fillets during short-term refrigerator storage. Acta Amazonica, Manaus, v. 49, n. 2, p. 152-161, abr./jun. 2019.| Biblioteca(s): Embrapa Agroindústria de Alimentos; Embrapa Agroindústria Tropical; Embrapa Meio-Norte. |
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| 105. | | BAIA, R. R. de J.; MALHEIROS, D. F.; VIDEIRA, M. N.; CARVALHO, A. A. de; SALOMÃO, C. B.; FERREIRA, I. M.; CANUTO, K. M.; YOSHIOKA, E. T. O.; TAVARES-DIAS, M. Eficácia do óleo de Carapa guianensis (Meliaceae) contra infestações de monogenéticos em Colossoma macropomum e seus efeitos hematológicos e histopatológicos. In: ENCONTRO BRASILEIRO DE PATOLOGISTAS DE ORGANISMOS AQUÁTICOS, 17., 2023, Belo Horizonte. Anais. [São Paulo]: Abrapoa, 2023.| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Amapá. |
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| 106. | | 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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| 107. | | 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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| 108. | | 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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| 109. | | SANTOS FILHO, L. G. A. dos; REIS, R. B. dos; SOUZA, A. S. de Q.; CANUTO, K. M.; CASTRO, K. N. de C.; PEREIRA, A. M. L.; DINIZ, F. M. Essential oil composition, antioxidant and antibacterial activity against Vibrio parahaemolyticus from five Lamiaceae species. Journal of Essential Oil Research, v. 34, n. 4, p. 313-321, 2022.| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Caprinos e Ovinos; Embrapa Gado de Leite; Embrapa Tabuleiros Costeiros. |
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| 110. | | 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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| 111. | | 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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| 112. | | LUZ, L. R.; PORTO, D. D.; CASTRO, C. B.; SILVA, M. F. S.; ALVES FILHO, E. G. A.; CANUTO, K. M.; BRITO, E. S. de; BECKER, H.; PESSOA, C. O.; ZOCOLO, G. J. Metabolomic profile of Schinopsis brasiliensis via UPLC-QTOF-MS for identification of biomarkers and evaluation of its cytotoxic potential. Journal of Chromatography B, v. 1099, p. 97-109, 2018.| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Semiárido. |
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| 113. | | FRANCA, L. G. da; ALVES FILHO, E.; RIBEIRO, L. B.; EVANGELISTA, J. S. B.; SILVA, L. M.; SOUZA, P. A. de; MOURA, C. F. H.; CANUTO, K. M.; ARAGAO, F. A. S. de. Metabolomic profiling of acerola clones according to the ripening stage. Journal of Food Measurement and Characterization, 2020. Article in press| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 114. | | 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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| 115. | | COELHO, C. R. C.; SANTOS, M. C. dos; JUMBO, L. V.; SENA FILHO, J. G. de; CASTRO, K. N. de C.; CANUTO, K. M.; BRITO, E. S. de; SOUZA, A. S. de; TEODORO, A. V. Bioactividad de Spilanthes acmella (Asteraceae) a Raoiella indica (Acari: Tenuipalpidae) y selectividad al depredador Amblyseius largoensis (Acari: Phytoseiidae). Revista de Protección Vegetal, v. 34, n. 1, jan./abr. 2019.| Biblioteca(s): Embrapa Tabuleiros Costeiros. |
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| 116. | | COELHO, C. R.; SANTOS, M. C. dos; JUMBO, L. V.; SENA FILHO, J. G. de; CASTRO, K. N. de C.; CANUTO, K. M.; BRITO, E. S. de; SOUZA, A. S. de Q.; TEODORO, A. V. Bioactividad de Spilanthes acmella (Asteraceae) a Raoiella indica (Acari: Tenuipalpidae) y selectividad al depredador Amblyseius largoensis (Acari: Phytoseiidae). Revista de Protección Vegetal, La Habana, v. 34, n. 1, 11 p., enero/abr. 2019.| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Meio-Norte. |
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| 117. | | 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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| 118. | | 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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| 119. | | 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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| 120. | | CARVALHO, K. R.; ZOCOLO, G. J.; PEREIRA, R. de C. A.; MARTINS, F. I. C. C.; RIBEIRO, P. R. V.; BRITO, E. S. de; SILVEIRA, E. R.; CANUTO, K. M. Development of a UPLC-ESI-MS method for simultaneous determination of flavonoids and diterpenes in Egletes viscosa (L.) Less herbal products. Journal of Pharmaceutical and Biomedical Analysis, New York, v. 166, p. 155-163, 20 Mar. 2019.| Biblioteca(s): Embrapa Agroindústria Tropical. |
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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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