13C NMR assignments of regenerated cellulose from solid-state 2D NMR spectroscopy
| Autor: | Staffan Schantz, Alexander Idström, Lars Nordstierna, Paul Gatenholm, Bradley F. Chmelka, Johan Sundberg |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Polymers and Plastics
Organic Chemistry chemistry.chemical_element Regenerated cellulose 02 engineering and technology Carbon-13 NMR 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Nanocellulose chemistry.chemical_compound Crystallography chemistry Materials Chemistry Organic chemistry Wetting Cellulose 0210 nano-technology Spectroscopy Carbon Two-dimensional nuclear magnetic resonance spectroscopy |
| Zdroj: | Carbohydrate Polymers. 151:480-487 |
| ISSN: | 0144-8617 |
| Popis: | From the assignment of the solid-state (13)C NMR signals in the C4 region, distinct types of crystalline cellulose, cellulose at crystalline surfaces, and disordered cellulose can be identified and quantified. For regenerated cellulose, complete (13)C assignments of the other carbon regions have not previously been attainable, due to signal overlap. In this study, two-dimensional (2D) NMR correlation methods were used to resolve and assign (13)C signals for all carbon atoms in regenerated cellulose. (13)C-enriched bacterial nanocellulose was biosynthesized, dissolved, and coagulated as highly crystalline cellulose II. Specifically, four distinct (13)C signals were observed corresponding to conformationally different anhydroglucose units: two signals assigned to crystalline moieties and two signals assigned to non-crystalline species. The C1, C4 and C6 regions for cellulose II were fully examined by global spectral deconvolution, which yielded qualitative trends of the relative populations of the different cellulose moieties, as a function of wetting and drying treatments. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect