| Full text | |
| Author(s): |
Facchinatto, William Marcondes
[1]
;
Garcia, Rodrigo Henrique dos Santos
[1]
;
Santos, Danilo Martins dos
[2]
;
Fiamingo, Anderson
[3]
;
Flores, Douglas William Menezes
[4]
;
Campana-Filho, Sergio Paulo
[1]
;
Azevedo, Eduardo Ribeiro de
[3]
;
Colnago, Luiz Alberto
[2]
Total Authors: 8
|
| Affiliation: | [1] Univ Sao Paulo, Sao Carlos Inst Chem, Ave Trabalhador Sao Carlense 400, Caixa Postal 780, BR-13566590 Sao Carlos, SP - Brazil
[2] Embrapa Instrumentat, Brazilian Corp Agr Res, Rua XV Novembro 1452, Caixa Postal 741, BR-13560970 Sao Carlos, SP - Brazil
[3] Univ Sao Paulo, Sao Carlos Inst Phys, Ave Trabalhador Sao Carlense 400, Caixa Postal 369, BR-13566590 Sao Carlos, SP - Brazil
[4] Univ Sao Paulo, Super Coll Agr Luiz de Queiroz, Ave Padua Dias 11, Caixa Postal 9, BR-13418900 Piracicaba, SP - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Carbohydrate Polymers; v. 256, MAR 15 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
Chitosans with different average degrees of acetylation and weight molecular weight were analyzed by time domain NMR relaxometry using the recently proposed pulse sequence named Rhim and Kessemeier Radio frequency Optimized Solid-Echo (RK-ROSE) to acquire H-1 NMR signal of solid-state materials. The NMR signal decay was composed of faster (tenths of mu s) 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 H-1-C-13 dipolar interaction. RK-ROSE data were modeled by using Partial Least Square (PLS) multivariate regression, which showed a high coefficient of determination (R-2 > 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. (AU) | |
| FAPESP's process: | 16/09720-4 - Use of membrane models to evaluate the biodegradability of chitosan |
| Grantee: | Anderson Fiamingo |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 17/20973-4 - Coaxial electrospun nanofibers based on chitosan for controlled release of antibiotics and periodontic lesion treatment |
| Grantee: | Danilo Martins dos Santos |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 19/13656-8 - Development and application of nuclear magnetic resonance in products and agricultural processes |
| Grantee: | Luiz Alberto Colnago |
| Support Opportunities: | Regular Research Grants |