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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
30/03/2021 |
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Data da última atualização: |
09/06/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
FACCHINATTO, W. M.; GARCIA, R. H. S.; SANTOS, D. M.; FIAMINGO, A.; FLORES, D. W. M.; CAMPANA-FILHO, S. P.; AZEVEDO, E. R.; COLNAGO, L. A. |
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Afiliação: |
LUIZ ALBERTO COLNAGO, CNPDIA. |
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Título: |
Fast-forward approach of time-domain NMR relaxometry for solid-state chemistry of chitosan. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Carbohydrate Polymers, v. 256, 117576, 2021. |
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Páginas: |
1 - 10 |
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ISSN: |
0144-8617 |
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DOI: |
https://doi.org/10.1016/j.carbpol.2020.117576 |
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Idioma: |
Inglês |
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Conteúdo: |
Chitosans with different average degrees of acetylation and weight molecular weight were analyzed by timedomain NMR relaxometry using the recently proposed pulse sequence named Rhim and Kessemeier - Radiofrequency Optimized Solid-Echo (RK-ROSE) to acquire 1 H NMR signal of solid-state materials. The NMR signal decay was composed of faster (tenths of μs) and longer components, where the mobile-part fraction exhibited an effective relaxation transverse time assigned to methyl hydrogens from N-acetyl-D-glucosamine (GlcNAc) units. The higher intrinsic mobility of methyl groups was confirmed via DIPSHIFT experiments by probing the 1 H-13C dipolar interaction. RK-ROSE data were modeled by using Partial Least Square (PLS) multivariate regression, which showed a high coefficient of determination (R2 > 0.93) between RK-ROSE signal profile and average degrees of acetylation and crystallinity index, thus indicating that time-domain NMR consists in a promising tool for structural and morphological characterization of chitosan. |
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Palavras-Chave: |
Crystallinity; Degree of acetylation; Relaxometry; TD-NMR. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01879naa a2200289 a 4500
001 2130986
005 2022-06-09
008 2021 bl uuuu u00u1 u #d
022 $a0144-8617
024 7 $ahttps://doi.org/10.1016/j.carbpol.2020.117576$2DOI
100 1 $aFACCHINATTO, W. M.
245 $aFast-forward approach of time-domain NMR relaxometry for solid-state chemistry of chitosan.$h[electronic resource]
260 $c2021
300 $a1 - 10
520 $aChitosans with different average degrees of acetylation and weight molecular weight were analyzed by timedomain NMR relaxometry using the recently proposed pulse sequence named Rhim and Kessemeier - Radiofrequency Optimized Solid-Echo (RK-ROSE) to acquire 1 H NMR signal of solid-state materials. The NMR signal decay was composed of faster (tenths of μs) and longer components, where the mobile-part fraction exhibited an effective relaxation transverse time assigned to methyl hydrogens from N-acetyl-D-glucosamine (GlcNAc) units. The higher intrinsic mobility of methyl groups was confirmed via DIPSHIFT experiments by probing the 1 H-13C dipolar interaction. RK-ROSE data were modeled by using Partial Least Square (PLS) multivariate regression, which showed a high coefficient of determination (R2 > 0.93) between RK-ROSE signal profile and average degrees of acetylation and crystallinity index, thus indicating that time-domain NMR consists in a promising tool for structural and morphological characterization of chitosan.
653 $aCrystallinity
653 $aDegree of acetylation
653 $aRelaxometry
653 $aTD-NMR
700 1 $aGARCIA, R. H. S.
700 1 $aSANTOS, D. M.
700 1 $aFIAMINGO, A.
700 1 $aFLORES, D. W. M.
700 1 $aCAMPANA-FILHO, S. P.
700 1 $aAZEVEDO, E. R.
700 1 $aCOLNAGO, L. A.
773 $tCarbohydrate Polymers$gv. 256, 117576, 2021.
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| 2. |  | ZANUNCIO, J. C.; MOLINA-RUGAMA, A.J.; SANTOS, G. P.; RAMALHO, F. de S. Effect of body weight on fecundity and longevity of the stinkbug predator Podisus rostralis. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 37, n. 9, p. 1225-1230, set. 2002 Título em português: Efeito do peso corporal na fecundidade e na longevidade do percevejo predador Podisus rostralis.| Biblioteca(s): Embrapa Unidades Centrais. |
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