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 | Acesso ao texto completo restrito à biblioteca da Embrapa Algodão. Para informações adicionais entre em contato com cnpa.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Agroindústria Tropical; Embrapa Algodão. |
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Data corrente: |
17/08/2017 |
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Data da última atualização: |
22/02/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
VASCONCELOS, N. F.; FEITOSA, J. P. DE A.; GAMA, F. M. P. DA; MORAIS, J. P. S.; ANDRADE, F. K.; SOUZA FILHO, M. de S. M. de; ROSA, M. de F. |
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Afiliação: |
NIÉDJA FITTIPALDI VASCONCELOS, Departamento de Química, Universidade Federal do Ceará (UFC); JUDITH PESSOA DE ANDRADE FEITOSA, Departamento de Química, Universidade Federal do Ceará (UFC); FRANCISCO MIGUEL PORTELA DA GAMA, Centro de Engenharia Biológica CEB, Instituto de Biotecnologia e Bioengenharia (IBB), Departamento de Engenharia Biológica, Universidade do Minho, Campus de Gualtar; JOAO PAULO SARAIVA MORAIS, CNPA; FABIA KARINE ANDRADE, Embrapa Agroindústria Tropical; MEN DE SA MOREIRA DE SOUZA FILHO, CNPAT; MORSYLEIDE DE FREITAS ROSA, CNPAT. |
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Título: |
Bacterial cellulose nanocrystals produced under different hydrolysis conditions: properties and morphological features. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
Carbohydrate Polymers, v. 155, p. 425-431, 2017. |
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DOI: |
10.1016/j.carbpol.2016.08.090 |
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Idioma: |
Inglês |
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Conteúdo: |
Bacterial cellulose (BC) is a polymer with interesting physical properties owing to the regular and uniformstructure of its nanofibers, which are formed by amorphous (disordered) and crystalline (ordered) regions.Through hydrolysis with strong acids, it is possible to transform BC into a stable suspension of cellulosenanocrystals, adding new functionality to the material. The aim of this work was to evaluate the effectsof inorganic acids on the production of BC nanocrystals (BCNCs). Acid hydrolysis was performed usingdifferent H2SO4concentrations and reaction times, and combined hydrolysis with H2SO4and HCl wasalso investigated. The obtained cellulose nanostructures were needle-like with lengths ranging between622 and 1322 nm, and diameters ranging between 33.7 and 44.3 nm. The nanocrystals had a crystallinityindex higher than native BC, and all BCNC suspensions exhibited zeta potential moduli greater than30 mV, indicating good colloidal stability. The mixture of acids resulted in improved thermal stabilitywithout decreased crystallinity. |
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Palavras-Chave: |
Bacterial cellulose; Cellulose nanocrystals; Celulose bacteriana; Nanocristais de celulose. |
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Thesagro: |
Ácido Clorídrico; Ácido Sulfúrico; Hidrolise. |
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Thesaurus Nal: |
hydrochloric acid; hydrolysis; sulfuric acid. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02072naa a2200325 a 4500
001 2083533
005 2018-02-22
008 2017 bl uuuu u00u1 u #d
024 7 $a10.1016/j.carbpol.2016.08.090$2DOI
100 1 $aVASCONCELOS, N. F.
245 $aBacterial cellulose nanocrystals produced under different hydrolysis conditions$bproperties and morphological features.$h[electronic resource]
260 $c2017
520 $aBacterial cellulose (BC) is a polymer with interesting physical properties owing to the regular and uniformstructure of its nanofibers, which are formed by amorphous (disordered) and crystalline (ordered) regions.Through hydrolysis with strong acids, it is possible to transform BC into a stable suspension of cellulosenanocrystals, adding new functionality to the material. The aim of this work was to evaluate the effectsof inorganic acids on the production of BC nanocrystals (BCNCs). Acid hydrolysis was performed usingdifferent H2SO4concentrations and reaction times, and combined hydrolysis with H2SO4and HCl wasalso investigated. The obtained cellulose nanostructures were needle-like with lengths ranging between622 and 1322 nm, and diameters ranging between 33.7 and 44.3 nm. The nanocrystals had a crystallinityindex higher than native BC, and all BCNC suspensions exhibited zeta potential moduli greater than30 mV, indicating good colloidal stability. The mixture of acids resulted in improved thermal stabilitywithout decreased crystallinity.
650 $ahydrochloric acid
650 $ahydrolysis
650 $asulfuric acid
650 $aÁcido Clorídrico
650 $aÁcido Sulfúrico
650 $aHidrolise
653 $aBacterial cellulose
653 $aCellulose nanocrystals
653 $aCelulose bacteriana
653 $aNanocristais de celulose
700 1 $aFEITOSA, J. P. DE A.
700 1 $aGAMA, F. M. P. DA
700 1 $aMORAIS, J. P. S.
700 1 $aANDRADE, F. K.
700 1 $aSOUZA FILHO, M. de S. M. de
700 1 $aROSA, M. de F.
773 $tCarbohydrate Polymers$gv. 155, p. 425-431, 2017.
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Registro original: |
Embrapa Algodão (CNPA) |
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Registro Completo
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Biblioteca(s): |
Embrapa Suínos e Aves. |
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Data corrente: |
27/09/2016 |
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Data da última atualização: |
28/09/2016 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
ALBRING, D. C.; SUPERTI, B. F. V.; SOUZA, A. P.; ZANELLA, E. L.; ZANELLA, R.; MARQUES, M. G. |
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Afiliação: |
DANIELA C. ALBRING, UNC-Concórdia, SC; BRUNA F. V. SUPERTI, UPF; ANDRESSA P. DE SOUZA, UDESC - Lages, SC; ERALDO LOURENÇO ZANELLA, UPF; RICARDO ZANELLA, UPF; MARIANA GROKE MARQUES, CNPSA. |
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Título: |
Effect of different melatonin concentration in integrity of acrosomal membrane in swine sperm cryopreserved. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
In: ANNUAL MEETING OF THE BRAZILIAN EMBRYO TECHNOLOGY SOCIETY (SBTE), 30., 2016, Foz do Iguaçu; MEETING OF THE EUROPEAN EMBRYO TRANSFER ASSOCIATION (AETE), 32., 2016, Barcelona. Proceedings... Animal Reproduction., v.13, n.3, p. 554, Jul./Sept. 2016. A180. 1 CD-Rom. |
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Idioma: |
Português |
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Palavras-Chave: |
Acrosomal. |
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Thesaurus NAL: |
cryopreservation; melatonin. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/147843/1/final8209.pdf
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Marc: |
LEADER 00829nam a2200193 a 4500
001 2053570
005 2016-09-28
008 2016 bl uuuu u00u1 u #d
100 1 $aALBRING, D. C.
245 $aEffect of different melatonin concentration in integrity of acrosomal membrane in swine sperm cryopreserved.$h[electronic resource]
260 $aIn: ANNUAL MEETING OF THE BRAZILIAN EMBRYO TECHNOLOGY SOCIETY (SBTE), 30., 2016, Foz do Iguaçu; MEETING OF THE EUROPEAN EMBRYO TRANSFER ASSOCIATION (AETE), 32., 2016, Barcelona. Proceedings... Animal Reproduction., v.13, n.3, p. 554, Jul./Sept. 2016. A180. 1 CD-Rom.$c2016
650 $acryopreservation
650 $amelatonin
653 $aAcrosomal
700 1 $aSUPERTI, B. F. V.
700 1 $aSOUZA, A. P.
700 1 $aZANELLA, E. L.
700 1 $aZANELLA, R.
700 1 $aMARQUES, M. G.
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