|
|
Registros recuperados : 113 | |
25. | | GALVANI, F.; BORSATO, A. V.; FAVARO, S. P. Processo de secagem de frutos de bocaiuva visando seu beneficiamento mecânico. In: SEMINÁRIO INTERNACIONAL DE AGROECOLOGIA DA AMÉRICA DO SUL, 2.; JORNADA INTERNACIONAL DE EDUCAÇÃO DO CAMPO, 1.; SEMINÁRIO DE AGROECOLOGIA DE MATO GROSSO DO SUL, 6; ENCONTRO DE PRODUTORES AGROECOLÓGICOS DE MATO GROSSO DO SUL, 5.; SEMINÁRIO DE SISTEMAS AGROFLORESTAIS EM BASES AGROECOLÓGICAS DE MATO GROSSO DO SUL, 2., 2016, Dourados. Agroecologia e soberania alimentar: saberes em busca do bem viver: anais. Dourados: UFGD, 2016. Não paginado. Agroecol 2016. 1 CD-ROM. Publicado também em: Cadernos de Agroecologia, v. 11, n. 2, 2016. Biblioteca(s): Embrapa Agroenergia; Embrapa Pantanal. |
| |
33. | | GALVANI, F.; CAMPOLIN, A. I.; PINHEIRO, R. S. Programa de gestão ambiental da Embrapa Pantanal. Corumbá, MS: Embrapa Pantanal, 2007. 3 p. (Embrapa Pantanal. Artigo de Divulgação na Mídia, 116). Disponível também em: agrosoft, douradosinforma, aixadanaweb, portabonito, aquidauananews, navirainews, aquidauananews, reporterms, zoonews, portaldoagronegocio, criareplantar, opantaneiro, msnoticias, bbcnews, boletimpecuario,... Biblioteca(s): Embrapa Pantanal. |
| |
34. | | TAPETI, C. F.; FAVARO, S. P.; ROSCOE, R.; GALVANI, F. Uniformidade de maturação dos frutos no cacho de macaúbas nativas do pantanal e cerrado. In: CONGRESSO BRASILEIRO DE MACAÚBA, 1., 2013, Patos de Minas, MG. Consolidação da cadeia produtiva: anais. Brasília, DF: MAPA, 2013. Biblioteca(s): Embrapa Agroenergia; Embrapa Pantanal. |
| |
35. | | CURADO, F. F.; MARQUES, D. K. S.; GALVANI, F.; FEIDEN, A.; SALIS, S. M.; PIOVEZAN, U. Ações de pesquisa e desenvolvimento realizadas por empresa pública de pesquisa agropecuária com povos e comunidades tradicionais no Pantanal Sul-Mato-Grossense. Cadernos de Ciência & Tecnologia, v. 39, n. 2, e26816, 2022. Título em inglês: Research and development actions carried out by a public agricultural research institution with traditional peoples and communities of the Pantanal Sul-Mato-Grossense. Biblioteca(s): Embrapa Alimentos e Territórios; Embrapa Pantanal; Embrapa Tabuleiros Costeiros; Embrapa Unidades Centrais. |
| |
36. | | GALVANI, F.; FÉLIX, C. G. S.; SORRILHA, G. M.; CARMONA, V. B.; MARCONCINI, J. M. Branqueamento de fibras de folhas e fibras do cacho/ráquis da bocaiuva visando a obtenção de celulose. Cadernos de Agroecologia, v. 10, n. 3, out. 2015. Edição dos Resumos do IX Congresso Brasileiro de Agroecologia e IV Seminário Estadual de Agroecologia, Belém, PA, set./out. 2015 Biblioteca(s): Embrapa Pantanal. |
| |
37. | | CARMONA, V. B.; GALVANI, F.; MARCONCINI, J. M.; MATTOSO, L. H. C. Branqueamento de folhas de gravatá (Brómelia balansae): obtenção e caracterização de celulose. In: WORKSHOP DA REDE DE NANOTECNOLOGIA APLICADA AO AGRONEGÓCIO, 6., 2012, Fortaleza. Anais... São Carlos: Embrapa Instrumentação; Fortaleza: Embrapa Agroindústria Tropical, 2012. p. 225-227. Editores: Maria Alice Martins, MOrsyleide de Freitas Rosa, Men de Sá Moreira de Souza Filho, Nicodemos Moreira dos Santos Junior, Odílio Benedito Garrido de Assis, Caue Ribeiro, Luiz Henrique Capparelli Mattoso. Biblioteca(s): Embrapa Instrumentação. |
| |
38. | | CARMONA, V. B.; GALVANI, F.; MARCONCINI, J. M.; MATTOSO, L. H. C. Branqueamento de folhas de gravatá (Bromélia balansae): obtenção e caracterização de celulose. In: WORKSHOP DA REDE DE NANOTECNOLOGIA APLICADA AO AGRONEGÓCIO, 7.; ESCOLA DE NANOTECNOLOGIA, 3., 2013, São Carlos, SP. Anais... São Carlos, SP: Embrapa Instrumentação, 2013. p. 205-207 Editores: Maria Alice Martins, Odílio Benedito Garrido de Assis, Caue Ribeiro, Luiz Henrique Capparelli Mattoso. CD-ROM. Editores: Maria Alice Martins, Odílio Benedito Garrido de Assis, Caue Ribeiro, Luiz Henrique Capparelli Mattoso. Biblioteca(s): Embrapa Instrumentação. |
| |
40. | | GALVANI, F. SORRILHA, G. M. CARMONA, V. B.; MARCONCINI, J. M.; FAVARO, S. P. Branqueamento de ráquis e cascas de macaúba (acrocomia aculeata (JACQ.) LODD. ex mart) visando a obtenção de celulose. In: WORKSHOP DA REDE DE NANOTECNOLOGIA APLICADA AO AGRONEGÓCIO, 8, 2014, Juiz de fora. Anais... São Carlos: Embrapa Instrumentação; Campo Grande: Embrapa Gado de Corte; Juiz de Fora: Embrapa Gado de Leite, 2014. p. 310-313. Editores: Maria Alice Martins, Humberto de Mello Brandão, Marlene de Barros Coelho, Daniel Souza Corrêa, Caue Ribeiro, Luiz Henrique Capparelli Mattoso. Biblioteca(s): Embrapa Instrumentação. |
| |
Registros recuperados : 113 | |
|
|
Registro Completo
Biblioteca(s): |
Embrapa Instrumentação; Embrapa Pantanal. |
Data corrente: |
08/11/2019 |
Data da última atualização: |
08/11/2019 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 1 |
Autoria: |
CORRÊA, A. C.; CARMONA, V. B.; SIMÃO, J. A.; GALVANI, F.; MARCONCINI, J. M.; MATTOSO, L. H. C. |
Afiliação: |
ANA CAROLINA CORRÊA; VITOR BRAIT CARMONA, UFSCar; JOSÉ ALEXANDRE SIMÃO, UFSCar; FABIO GALVANI, CPAP; JOSE MANOEL MARCONCINI, CNPDIA; LUIZ HENRIQUE CAPPARELLI MATTOSO, CNPDIA. |
Título: |
Cellulose nanocrystals from fibers of Macauba (Acrocomia Aculeata) and Gravata (Bromelia Balansae) from Brazilian Pantanal. |
Ano de publicação: |
2019 |
Fonte/Imprenta: |
Polymers, v. 11, n. 1785, p. 1-19, 2019. |
DOI: |
doi:10.3390/polym11111785 |
Idioma: |
Inglês |
Conteúdo: |
Cellulose nanocrystals (CNC) were obtained from macauba and gravata fibers. Macauba (or Bocaiuva) is a palm tree found throughout most of Brazil and Gravata is an abundant kind of bromeliab with 1-2m long leaves, found in Brazilian Pantanal and Cerrado. The raw fibers of both fibers were mercerized with NaOH solutions and bleached; they were then submitted to acid hydrolysis using H2SO4 at 45 ?C, varying the hydrolysis time from 15 up to 75 min. The fibers were analyzed by X-ray diffraction (XRD), FTIR Spectroscopy, scanning electron microscopy (SEM) and thermal stability by thermogravimetric analysis (TG). XRD patterns did not present changes in the crystal structure of cellulose after mercerization, but it was observed a decrease of hemicellulose and lignin contents, and consequently an increase of cellulose content with the increase of NaOH solution concentration in the mercerization. After acid hydrolysis, the cellulose nanocrystals (CNC) were also analyzed by transmission electron microscopy (TEM) which showed an acicular or rod-like aspect and nanometric dimensions of CNC from both fibers, but the higher values of aspect ratio (L/D) were found on CNC obtained from gravata after 45 min of acid hydrolysis. The mercerization and subsequent bleaching of fibers influenced the crystallinity index and thermal stability of the resulting CNC, but their properties are mainly influenced by the hydrolysis time, i. e., there is an increase in crystallinity and thermal stability up to 45 min of hydrolysis, after this time, both properties decrease, probably due to the cellulose degradation by the sulfuric acid. MenosCellulose nanocrystals (CNC) were obtained from macauba and gravata fibers. Macauba (or Bocaiuva) is a palm tree found throughout most of Brazil and Gravata is an abundant kind of bromeliab with 1-2m long leaves, found in Brazilian Pantanal and Cerrado. The raw fibers of both fibers were mercerized with NaOH solutions and bleached; they were then submitted to acid hydrolysis using H2SO4 at 45 ?C, varying the hydrolysis time from 15 up to 75 min. The fibers were analyzed by X-ray diffraction (XRD), FTIR Spectroscopy, scanning electron microscopy (SEM) and thermal stability by thermogravimetric analysis (TG). XRD patterns did not present changes in the crystal structure of cellulose after mercerization, but it was observed a decrease of hemicellulose and lignin contents, and consequently an increase of cellulose content with the increase of NaOH solution concentration in the mercerization. After acid hydrolysis, the cellulose nanocrystals (CNC) were also analyzed by transmission electron microscopy (TEM) which showed an acicular or rod-like aspect and nanometric dimensions of CNC from both fibers, but the higher values of aspect ratio (L/D) were found on CNC obtained from gravata after 45 min of acid hydrolysis. The mercerization and subsequent bleaching of fibers influenced the crystallinity index and thermal stability of the resulting CNC, but their properties are mainly influenced by the hydrolysis time, i. e., there is an increase in crystallinity and thermal stability up ... Mostrar Tudo |
Palavras-Chave: |
Cellulose nanocrystals; Characterization; Pantanal fibers. |
Thesagro: |
Celulose; Fibra Vegetal; Gravata; Macaúba. |
Thesaurus NAL: |
Acrocomia; Cellulose; Nanocrystals; Plant fibers. |
Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/204457/1/Cellulose-nanocrystals-macauba-gravata-2019.pdf
|
Marc: |
LEADER 02563naa a2200325 a 4500 001 2114101 005 2019-11-08 008 2019 bl uuuu u00u1 u #d 024 7 $adoi:10.3390/polym11111785$2DOI 100 1 $aCORRÊA, A. C. 245 $aCellulose nanocrystals from fibers of Macauba (Acrocomia Aculeata) and Gravata (Bromelia Balansae) from Brazilian Pantanal.$h[electronic resource] 260 $c2019 520 $aCellulose nanocrystals (CNC) were obtained from macauba and gravata fibers. Macauba (or Bocaiuva) is a palm tree found throughout most of Brazil and Gravata is an abundant kind of bromeliab with 1-2m long leaves, found in Brazilian Pantanal and Cerrado. The raw fibers of both fibers were mercerized with NaOH solutions and bleached; they were then submitted to acid hydrolysis using H2SO4 at 45 ?C, varying the hydrolysis time from 15 up to 75 min. The fibers were analyzed by X-ray diffraction (XRD), FTIR Spectroscopy, scanning electron microscopy (SEM) and thermal stability by thermogravimetric analysis (TG). XRD patterns did not present changes in the crystal structure of cellulose after mercerization, but it was observed a decrease of hemicellulose and lignin contents, and consequently an increase of cellulose content with the increase of NaOH solution concentration in the mercerization. After acid hydrolysis, the cellulose nanocrystals (CNC) were also analyzed by transmission electron microscopy (TEM) which showed an acicular or rod-like aspect and nanometric dimensions of CNC from both fibers, but the higher values of aspect ratio (L/D) were found on CNC obtained from gravata after 45 min of acid hydrolysis. The mercerization and subsequent bleaching of fibers influenced the crystallinity index and thermal stability of the resulting CNC, but their properties are mainly influenced by the hydrolysis time, i. e., there is an increase in crystallinity and thermal stability up to 45 min of hydrolysis, after this time, both properties decrease, probably due to the cellulose degradation by the sulfuric acid. 650 $aAcrocomia 650 $aCellulose 650 $aNanocrystals 650 $aPlant fibers 650 $aCelulose 650 $aFibra Vegetal 650 $aGravata 650 $aMacaúba 653 $aCellulose nanocrystals 653 $aCharacterization 653 $aPantanal fibers 700 1 $aCARMONA, V. B. 700 1 $aSIMÃO, J. A. 700 1 $aGALVANI, F. 700 1 $aMARCONCINI, J. M. 700 1 $aMATTOSO, L. H. C. 773 $tPolymers$gv. 11, n. 1785, p. 1-19, 2019.
Download
Esconder MarcMostrar Marc Completo |
Registro original: |
Embrapa Pantanal (CPAP) |
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
Nenhum registro encontrado para a expressão de busca informada. |
|
|