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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
23/03/2005 |
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Data da última atualização: |
23/03/2005 |
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Autoria: |
FORATO, L. A.; BICUDO, T. C.; COLNAGO, L. A. |
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Título: |
Conformation of alfa Zeins in solid state by fourier Transform IR. |
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Ano de publicação: |
2003 |
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Fonte/Imprenta: |
Biopolymers (Biospectroscopy), v. 72, 421-426, 2003. |
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Idioma: |
Inglês |
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Conteúdo: |
ABSTRACT: The major maize storage proteins (alpha zeins) are deposited as an insoluble mass in the protein bodies of the endosperm. Because they are insoluble in water, most structural studies are performed in alcohol solutions. To solve the question raised by several authors about denaturation of the a zein structure by alcohol, we analyze the secondary structure of a zeins prepared with and without solubilization in alcohol (corn gluten meal and protein bodies with high concentrations of a zeins and traces of beta zeins). The secondary structures of a zeins are analyzed in the solid state by Fourier transform IR spectroscopy (FTIR) in KBr penets and solid-state 13C-NMR spectroscopy. The proportion of secondary structures obtained by FTIR of a zeins prepared with and without solubilization in alcohol yield almost identical proportions of a helices and (3 sheets. The proportion of a helices (43%) agrees with that measured by circular dichroism in an alcohol solution. However, the proportion of beta sheets (28%) is higher than the one measured by the same technique. Gluten and protein body samples with high beta zein content showed higher beta sheet and lower a helix proportions than that obtained for a zein preparations. The solid-state 13C-NMR spectra show the carbonyl peak for the a zeins at Delta 176 and for the sample rich in beta zeins at gama 172, which demonstrares the presence of a high C9ntent of a helices and beta sheets, respectively. These results indicare that alcohol solubilization does not affect the conformation of a zeins, validating the secondary structure measurements in solution. MenosABSTRACT: The major maize storage proteins (alpha zeins) are deposited as an insoluble mass in the protein bodies of the endosperm. Because they are insoluble in water, most structural studies are performed in alcohol solutions. To solve the question raised by several authors about denaturation of the a zein structure by alcohol, we analyze the secondary structure of a zeins prepared with and without solubilization in alcohol (corn gluten meal and protein bodies with high concentrations of a zeins and traces of beta zeins). The secondary structures of a zeins are analyzed in the solid state by Fourier transform IR spectroscopy (FTIR) in KBr penets and solid-state 13C-NMR spectroscopy. The proportion of secondary structures obtained by FTIR of a zeins prepared with and without solubilization in alcohol yield almost identical proportions of a helices and (3 sheets. The proportion of a helices (43%) agrees with that measured by circular dichroism in an alcohol solution. However, the proportion of beta sheets (28%) is higher than the one measured by the same technique. Gluten and protein body samples with high beta zein content showed higher beta sheet and lower a helix proportions than that obtained for a zein preparations. The solid-state 13C-NMR spectra show the carbonyl peak for the a zeins at Delta 176 and for the sample rich in beta zeins at gama 172, which demonstrares the presence of a high C9ntent of a helices and beta sheets, respectively. These results indicare that a... Mostrar Tudo |
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Palavras-Chave: |
alfa Zeins; Conformação; Estado sólido; Estrutura Secundárias; NMR; Spectroscopia IR Fourier. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02217naa a2200217 a 4500
001 1028875
005 2005-03-23
008 2003 bl --- 0-- u #d
100 1 $aFORATO, L. A.
245 $aConformation of alfa Zeins in solid state by fourier Transform IR.
260 $c2003
520 $aABSTRACT: The major maize storage proteins (alpha zeins) are deposited as an insoluble mass in the protein bodies of the endosperm. Because they are insoluble in water, most structural studies are performed in alcohol solutions. To solve the question raised by several authors about denaturation of the a zein structure by alcohol, we analyze the secondary structure of a zeins prepared with and without solubilization in alcohol (corn gluten meal and protein bodies with high concentrations of a zeins and traces of beta zeins). The secondary structures of a zeins are analyzed in the solid state by Fourier transform IR spectroscopy (FTIR) in KBr penets and solid-state 13C-NMR spectroscopy. The proportion of secondary structures obtained by FTIR of a zeins prepared with and without solubilization in alcohol yield almost identical proportions of a helices and (3 sheets. The proportion of a helices (43%) agrees with that measured by circular dichroism in an alcohol solution. However, the proportion of beta sheets (28%) is higher than the one measured by the same technique. Gluten and protein body samples with high beta zein content showed higher beta sheet and lower a helix proportions than that obtained for a zein preparations. The solid-state 13C-NMR spectra show the carbonyl peak for the a zeins at Delta 176 and for the sample rich in beta zeins at gama 172, which demonstrares the presence of a high C9ntent of a helices and beta sheets, respectively. These results indicare that alcohol solubilization does not affect the conformation of a zeins, validating the secondary structure measurements in solution.
653 $aalfa Zeins
653 $aConformação
653 $aEstado sólido
653 $aEstrutura Secundárias
653 $aNMR
653 $aSpectroscopia IR Fourier
700 1 $aBICUDO, T. C.
700 1 $aCOLNAGO, L. A.
773 $tBiopolymers (Biospectroscopy)$gv. 72, 421-426, 2003.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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Biblioteca(s): |
Embrapa Rondônia. |
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Data corrente: |
10/03/2017 |
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Data da última atualização: |
10/03/2017 |
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Tipo da produção científica: |
Capítulo em Livro Técnico-Científico |
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Autoria: |
CERQUEIRA, C. C. A. X.; LOCATELLI, M.; OLIVEIRA, A. C. de; GOMES, V.; SOUZA JÚNIOR, B. de M. S.; SOUZA, C. M. de. |
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Afiliação: |
Cláudia Cleomar A. Ximenes Cerqueira, UNIR; MARILIA LOCATELLI, CPAF-Rondonia; Adriana Correia de Oliveira, UNIR; Viviane Gomes, Faculdade de Pimenta Bueno; Benedito de Matos Souza Júnior, Faculdade de Pimenta Bueno; Cleberson Macedo de Souza, Faculdade de Pimenta Bueno. |
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Título: |
Geografia do medo o medo e as enchentes entre 2010 e 2015 no município de Pimenta Bueno, Rondônia, Brasil. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
In: STACHIW, R.; CARAMELLO, N. (Org.). Amazônia: instrumentos para gestão de recursos hídricos. Curitiba: CRV, 2016. p. 477-490. |
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Idioma: |
Português |
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Conteúdo: |
O capítulo discute a necessidade de explorar o impacto social das enchentes para a elaboração de políticas públicas e socioambientais, quando da estruturação de comitês de bacias hidrográficas. |
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Thesagro: |
Enchente. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/157495/1/capitulo-marilialocatelli.pdf
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Marc: |
LEADER 00888naa a2200193 a 4500
001 2066683
005 2017-03-10
008 2016 bl uuuu u00u1 u #d
100 1 $aCERQUEIRA, C. C. A. X.
245 $aGeografia do medo o medo e as enchentes entre 2010 e 2015 no município de Pimenta Bueno, Rondônia, Brasil.$h[electronic resource]
260 $c2016
520 $aO capítulo discute a necessidade de explorar o impacto social das enchentes para a elaboração de políticas públicas e socioambientais, quando da estruturação de comitês de bacias hidrográficas.
650 $aEnchente
700 1 $aLOCATELLI, M.
700 1 $aOLIVEIRA, A. C. de
700 1 $aGOMES, V.
700 1 $aSOUZA JÚNIOR, B. de M. S.
700 1 $aSOUZA, C. M. de
773 $tIn: STACHIW, R.; CARAMELLO, N. (Org.). Amazônia: instrumentos para gestão de recursos hídricos. Curitiba: CRV, 2016. p. 477-490.
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