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| Registros recuperados : 23 | |
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| 6. | | ANDRADE, R. M. S.; SILVA, E. M. M.; ASCHERI, J. L. R.; GONÇALVES, E. C. B. A.; SICILIANO, I. Análise de preferência de extrusados expandidos (snacks) a base de milho com adição de farinha de arroz. In: CONGRESSO BRASILEIRO DE PROCESSAMENTO DE FRUTAS E HORTALIÇAS, 1., 2009, Rio de Janeiro. Alimentação, qualidade de vida e auto-sustentabilidade: anais... Rio de Janeiro: SBPFH, 2009. 1 CD-ROM.| Biblioteca(s): Embrapa Agroindústria de Alimentos. |
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| 7. | | PEDROSA, C. L. F.; TADINI, A. M.; GONÇALVES, E. C.; SOUZA, E. D. de; MARTIN NETO, L. Análise da qualidade da Matéria Orgânica do Solo em sistemas de manejo de culturas de algodão. In: JORNADA CIENTÍFICA - EMBRAPA SÃO CARLOS, 13., 2021, São Carlos, SP. Anais... São Carlos: Embrapa Pecuária Sudeste: Embrapa Instrumentação, 2021. Editores técnicos: Alexandre Berndt, Ana Rita de Araujo Nogueira, Lea Chapaval Andri, Marcelo Mattos Cavallari, Manuel Antonio Chagas Jacinto.| Biblioteca(s): Embrapa Instrumentação. |
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| 9. | | DIAS, H. L. T.; ESPINHEIRO, R. de F.; ALBUQUERQUE, N. I. de; BONFIM, S. R. K. M.; LOPES, M. L.; GONÇALVES, E. C. Aglutininas Anti-Leptospira sp. em várias espécies de animais domésticos da região Amazônica, Brasil. In: CONFERÊNCIA NACIONAL DE DEFESA AGROPECUÁRIA, 4., 2013, Belém, PA. Defesa agropecuária e sustentabilidade. Belém, PA: SBDA, 2014. p. 106-107.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 10. | | ESPINHEIRO, R. de F.; MORAES, P. H. G.; SILVA, F. D. F. da; GONÇALVES, E. C.; ALBUQUERQUE, N. I. de; BOMFIM, S. R. M.; DIAS, H. L. T. Isolamento de Escherichia coli do trato gastrointestinal e fezes de caititus (Pecari tajacu) criados em cativeiro. In: INTERNATIONAL CONFERENCE ON WILDLIFE MANAGEMENT IN AMAZONIA AND LATIN AMERICA, 11., 2014, St. Augustine, Trinidad and Tobago. Alternative Sustainable Conservation & Utilization Methods for Neo-tropical Animals: livro de resumos. St. Augustine: UWI, 2014. p. 103-104.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 11. | | ARANTES, F. C.; SCALOPPI JUNIOR, E. J. S.; GONÇALVES, P. S.; MORAES, M. L. T. de; GONÇALVES, E. C. P.; RESENDE, M. D. V. de. Adaptability and stability in rubber tree progenies under different environmental conditions. Pesquisa Florestal Brasileira, Colombo, v. 33, n. 73, p. 37-44, jan./mar. 2013.| Biblioteca(s): Embrapa Florestas. |
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| 12. | | SILVA, L. K. N. da; SILVA, C. S.; MARQUES, J. R. F.; BARBOSA, E. M.; GONÇALVES, E. C.; SILVA FILHO, E. da. Análise do polimorfismo do gene da leptina - LEP(1620) - em búfalos da região amazônica. In: SEMINÁRIO ANUAL DE INICIAÇÃO CIENTÍFICA DA UFRA, 15., 2017, Belém, PA. Anais... Belém, PA: UFRA, 2018. p. 51. Organizadoras: Paula Fernanda Viegas Pinheiro e Tatianne Feitosa Soares.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 13. | | DIAS, H. L. T.; ESPINHEIRO, R. de F.; ALBUQUERQUE, N. I. de; BONFIM, S. R. K. M.; GONÇALVES, E. C.; AGUIAR, D. C. F. A serological survey to determine the commonly occurring serovars of Leptospira sp.in herds buffaloes in the Para State, Brazil. In: CONFERÊNCIA NACIONAL DE DEFESA AGROPECUÁRIA, 4., 2013, Belém, PA. Defesa agropecuária e sustentabilidade. Belém, PA: SBDA, 2014. p. 96-97.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 14. | | SILVA, M. J.; BONDANCIA, T. J.; AGUIAR, J. de; GONÇALVES, E. C. P.; FARINAS, C. S.; MARTINS, M. A.; MATTOSO, L. H. C. Cellulose nanomaterials from rubberwood obtained via enzymatic hydrolysis route. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE QUÍMICA, 45., 2022, Maceió. Química para o Desenvolvimento Sustentável e Soberano. Livro de resumos. Maceió, AL: Aptor Software, 2022.| Biblioteca(s): Embrapa Instrumentação. |
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| 15. | | SANTOS, M. C. P. dos; GOMES, S.; PULMONAR, M.; PACHECO, S.; GODOY, R. L. de O.; GONÇALVES, E. C. B. de A. Bioactive profile of a spray-dried supplement of fruits and vegetables and its residues: a full and sustainable exploitation. Semear, v. 2, n. 1, p. 13-18, jan./jun. 2020.| Biblioteca(s): Embrapa Agroindústria de Alimentos. |
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| 16. | | ANDRADE, R. M. S. de; SILVA, E. M. M. da; SICILIANO, I.; ASCHERI, J. L. R.; GONÇALVES, E. C. B. de A. Caracterização física de extrusados expandidos (snacks) a base de grits de milho e farinha de arroz. Higiene Alimentar, São Paulo, v. 23, n. 170/171, p. 549, mar./abr. 2009. Edição dos Resumos do IV Congresso Latinoamericano e X Congresso Brasileiro de Higienistas Alimentos, III Encontro Nacional de Centros de Controle de Zoonoses, II Encontro do Sistema Brasileiro de Inspeção de Produtos de Origem Animal, Florianópolis, abr. 2009.| Biblioteca(s): Embrapa Agroindústria de Alimentos. |
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| 17. | | GONÇALVES, P. de S.; SCALOPPI JÚNIOR, E. J.; MARTINS, M. A.; MORENO, R. M. B.; BRANCO, R. B. F.; GONÇALVES, E. C. P. Assessment of growth and yield performance of rubber tree clones of the IAC 500 series. Pesq. agropec. bras,. Brasília, v. 46, n.12, p. 1643-1649, dez. 2011.| Biblioteca(s): Embrapa Instrumentação; Embrapa Unidades Centrais. |
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| 18. | | MORAES, L. A.; ESPINHEIRO, R. de F.; NASCIMENTO, L. de C. S. do; EVERTON, E. B.; ALBUQUERQUE, N. I. de; GONÇALVES, E. C.; DIAS, H. L. T. Detecção molecular de 'Candidatus Mycoplasma kahanei' em uma população de catetos mantidos em cativeiro. In: INTERNATIONAL CONFERENCE ON WILDLIFE MANAGEMENT IN AMAZONIA AND LATIN AMERICA, 11., 2014, St. Augustine, Trinidad and Tobago. Alternative Sustainable Conservation & Utilization Methods for Neo-tropical Animals: livro de resumos. St. Augustine: UWI, 2014. p. 107.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 19. | | ESPINHEIRO, R. de F.; BONFIM, S. R. K. M.; ALBUQUERQUE, N. I. de; LOPES, M. L.; VASCONCELLOS, S. A.; GONÇALVES, E. C. A study of anti-Leptospira sp. antibodies in farm livestock of Para State, Brazil. In: CONFERÊNCIA NACIONAL DE DEFESA AGROPECUÁRIA, 4., 2013, Belém, PA. Defesa agropecuária e sustentabilidade. Belém, PA: SBDA, 2014. p. 94-95.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| Registros recuperados : 23 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
30/11/2022 |
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Data da última atualização: |
22/01/2024 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
SILVA, M. J.; BONDANCIA, T. J.; AGUIAR, J. de; GONÇALVES, E. C. P.; FARINAS, C. S.; MARTINS, M. A.; MATTOSO, L. H. C. |
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Afiliação: |
CRISTIANE SANCHEZ FARINAS, CNPDIA; MARIA ALICE MARTINS, CNPDIA; LUIZ HENRIQUE CAPPARELLI MATTOSO, CNPDIA. |
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Título: |
Cellulose nanomaterials from rubberwood obtained via enzymatic hydrolysis route. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE QUÍMICA, 45., 2022, Maceió. Química para o Desenvolvimento Sustentável e Soberano. Livro de resumos. Maceió, AL: Aptor Software, 2022. |
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Idioma: |
Inglês |
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Conteúdo: |
Novel strategy for the production of advanced materials from the waste generated in natural rubber exploration can improve the whole production chain(PARASHAR and CHAWLA, 2021). Lignocellulosic biomass from rubberwood has the potential for several applications, being formed by cellulose, hemicellulose, lignin, and inorganic compounds in smaller amounts. In this context, this work shows the characterization of nanomaterials obtained via enzymatic hydrolysis from bleached fibers of rubber tree. The fibers were mercerized with 5% (w/w) aqueous sodium hydroxide solution for 2h at 80 °C. Afterwards, the fibers were bleached with a solution composed of equal parts (v/v) of acetate buffer (27% by weight NaOH and 7.5% (v/v) glacial acetic acid, in distilled water) and aqueous sodium chlorite (1.7% by weight NaClO2 in water). Then, the fibers were bleached twice with a solution of equal parts (v/v) of 4% NaOH (w/w) and 24% H2O2 (v/v). The bleached fiber was submitted to enzymatic hydrolysis in sodium citrate buffer (0.1 M, pH 5), with a solids load of 15% (w/v) and an enzymatic load (Cellic Ctec 3 Novozymes®) of 10 mg / g of biomass in a shaker incubator at 50 °C. and 200 rpm for 48h. The characterizations were made by AFM measurements (Dimension V microscope - Veeco); X-ray diffraction (XRD) using a Shimadzu 6000 diffractometer with CuK ( = 1,54 Å), at room temperature and with 2 angle between 5 and 40° (1° min-1); thermogravimetric analysis (TGA) in an inert atmosphere, using TA Instruments equipment, model Q500 with a heating rate of 10 °C/min from room temperature to 600 °C. The X-ray diffractograms showed that the main peaks corresponding to the crystallographic planes of Type I cellulose. The Bragg angles (2) were: 16.0°, 22.4° and 34.6°, with the highest intensity in the crystallographic plane (002). The crystallinity index, calculated according to the method proposed by Segal (1959), was 57.8% for in natura fiber, 75.1% for bleached fiber and 80.8% after hydrolysis. Analyzing the thermograms, it was observed that the Tonset of the fiber in natura was 289 °C, that of the bleached fiber was 292 °C and after the hydrolysis it was 327 °C. There was a change in the maximum degradation peak, in the final temperature of the process and in the amount of residue after the treatment. The AFM images exhibited structures rod-like shapes, with mean length of 349.9±169.6 nm and the diameter of 4.0±1.7 nm, after 48h to enzymatic hydrolysis. Our results showed that the obtained nanomaterials can be effectively extracted from the studied lignocellulosic source using the enzymatic route. The nanostructures showed high crystallinity, excellent thermal stability and high aspect ratio. Thus, nanomaterials presented important characteristics for the use in several applications, including as reinforcement. MenosNovel strategy for the production of advanced materials from the waste generated in natural rubber exploration can improve the whole production chain(PARASHAR and CHAWLA, 2021). Lignocellulosic biomass from rubberwood has the potential for several applications, being formed by cellulose, hemicellulose, lignin, and inorganic compounds in smaller amounts. In this context, this work shows the characterization of nanomaterials obtained via enzymatic hydrolysis from bleached fibers of rubber tree. The fibers were mercerized with 5% (w/w) aqueous sodium hydroxide solution for 2h at 80 °C. Afterwards, the fibers were bleached with a solution composed of equal parts (v/v) of acetate buffer (27% by weight NaOH and 7.5% (v/v) glacial acetic acid, in distilled water) and aqueous sodium chlorite (1.7% by weight NaClO2 in water). Then, the fibers were bleached twice with a solution of equal parts (v/v) of 4% NaOH (w/w) and 24% H2O2 (v/v). The bleached fiber was submitted to enzymatic hydrolysis in sodium citrate buffer (0.1 M, pH 5), with a solids load of 15% (w/v) and an enzymatic load (Cellic Ctec 3 Novozymes®) of 10 mg / g of biomass in a shaker incubator at 50 °C. and 200 rpm for 48h. The characterizations were made by AFM measurements (Dimension V microscope - Veeco); X-ray diffraction (XRD) using a Shimadzu 6000 diffractometer with CuK ( = 1,54 Å), at room temperature and with 2 angle between 5 and 40° (1° min-1); thermogravimetric analysis (TGA) in an inert... Mostrar Tudo |
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Palavras-Chave: |
Physicochemical characterization; Rubberwood Biomass. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1149014/1/P-Cellulose-nanomaterials-from-rubberwood-obtained-via-enzymatic-hydrolysis.pdf
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Marc: |
LEADER 03650nam a2200205 a 4500
001 2149014
005 2024-01-22
008 2022 bl uuuu u00u1 u #d
100 1 $aSILVA, M. J.
245 $aCellulose nanomaterials from rubberwood obtained via enzymatic hydrolysis route.$h[electronic resource]
260 $aIn: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE QUÍMICA, 45., 2022, Maceió. Química para o Desenvolvimento Sustentável e Soberano. Livro de resumos. Maceió, AL: Aptor Software$c2022
520 $aNovel strategy for the production of advanced materials from the waste generated in natural rubber exploration can improve the whole production chain(PARASHAR and CHAWLA, 2021). Lignocellulosic biomass from rubberwood has the potential for several applications, being formed by cellulose, hemicellulose, lignin, and inorganic compounds in smaller amounts. In this context, this work shows the characterization of nanomaterials obtained via enzymatic hydrolysis from bleached fibers of rubber tree. The fibers were mercerized with 5% (w/w) aqueous sodium hydroxide solution for 2h at 80 °C. Afterwards, the fibers were bleached with a solution composed of equal parts (v/v) of acetate buffer (27% by weight NaOH and 7.5% (v/v) glacial acetic acid, in distilled water) and aqueous sodium chlorite (1.7% by weight NaClO2 in water). Then, the fibers were bleached twice with a solution of equal parts (v/v) of 4% NaOH (w/w) and 24% H2O2 (v/v). The bleached fiber was submitted to enzymatic hydrolysis in sodium citrate buffer (0.1 M, pH 5), with a solids load of 15% (w/v) and an enzymatic load (Cellic Ctec 3 Novozymes®) of 10 mg / g of biomass in a shaker incubator at 50 °C. and 200 rpm for 48h. The characterizations were made by AFM measurements (Dimension V microscope - Veeco); X-ray diffraction (XRD) using a Shimadzu 6000 diffractometer with CuK ( = 1,54 Å), at room temperature and with 2 angle between 5 and 40° (1° min-1); thermogravimetric analysis (TGA) in an inert atmosphere, using TA Instruments equipment, model Q500 with a heating rate of 10 °C/min from room temperature to 600 °C. The X-ray diffractograms showed that the main peaks corresponding to the crystallographic planes of Type I cellulose. The Bragg angles (2) were: 16.0°, 22.4° and 34.6°, with the highest intensity in the crystallographic plane (002). The crystallinity index, calculated according to the method proposed by Segal (1959), was 57.8% for in natura fiber, 75.1% for bleached fiber and 80.8% after hydrolysis. Analyzing the thermograms, it was observed that the Tonset of the fiber in natura was 289 °C, that of the bleached fiber was 292 °C and after the hydrolysis it was 327 °C. There was a change in the maximum degradation peak, in the final temperature of the process and in the amount of residue after the treatment. The AFM images exhibited structures rod-like shapes, with mean length of 349.9±169.6 nm and the diameter of 4.0±1.7 nm, after 48h to enzymatic hydrolysis. Our results showed that the obtained nanomaterials can be effectively extracted from the studied lignocellulosic source using the enzymatic route. The nanostructures showed high crystallinity, excellent thermal stability and high aspect ratio. Thus, nanomaterials presented important characteristics for the use in several applications, including as reinforcement.
653 $aPhysicochemical characterization
653 $aRubberwood Biomass
700 1 $aBONDANCIA, T. J.
700 1 $aAGUIAR, J. de
700 1 $aGONÇALVES, E. C. P.
700 1 $aFARINAS, C. S.
700 1 $aMARTINS, M. A.
700 1 $aMATTOSO, L. H. C.
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