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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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| 1. |  | ZANGARO, W.; LESCANO, L. E. A. M.; MATSUURA, E. M.; RONDINA, A. B. L.; NOGUEIRA, M. A. Differences between root traits of early- and late-successional trees influence below-ground competition and seedling establishment. Journal of Tropical Ecology, Cambridge, v. 32, n. 4, p. 300-313, Jul. 2016.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
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| 3. | | RONDINA, A. B. L.; LESCANO, L. E. A. M.; ALVES, R. de A.; MATSUURA, E. M.; NOGUEIRA, M. A.; ZANGARO, W. Arbuscular mycorrhizas increase survival, precocity and flowering of herbaceous and shrubby species of early stages of tropical succession in pot cultivation. Journal of Tropical Ecology, Cambridge, v. 30, n. 6, p. 599-614, Nov. 2014.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
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| 4. | | RONDINA, A. B. L.; TONON, B. C.; HONDA, C.; MATSUURA, E. M.; SILVA, B. M.; HUNGRIA, M.; NOGUEIRA, M. A.; ZANGARO, W. Can arbuscular mycorrhizas mediate interactions between plants of different successional stages and N-cycling microorganisms? In: REUNIÃO LATINOAMERICANA DE RIZOBIOLOGIA - RELAR, 27., 2016, Londrina. Fortalecendo as parcerias Sul-Sul: anais. Curitiba: SBCS-NEPAR, 2016. p. 134. Editores: Mariangela Hungria, Douglas Fabiano Gomes, Arnaldo Colozzi Filho.| Tipo: Resumo em Anais de Congresso |
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