13C NMR assignments of regenerated cellulose from solid-state 2D NMR spectroscopy
Artikel i vetenskaplig tidskrift, 2016

From the assignment of the solid-state 13C 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 13C 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 13C signals for all carbon atoms in regenerated cellulose. 13C-enriched bacterial nanocellulose was biosynthesized, dissolved, and coagulated as highly crystalline cellulose II. Specifically, four distinct 13C 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.

Regenerated cellulose

Mercerized cellulose

2D correlation NMR

13C CP/MAS NMR

Deconvolution

Assignment

Författare

Alexander Idström

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Staffan Schantz

AstraZeneca AB

Johan Sundberg

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

B. F. Chmelka

University of California

Paul Gatenholm

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Wallenberg Wood Science Center (WWSC)

Lars Nordstierna

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Carbohydrate Polymers

0144-8617 (ISSN)

Vol. 151 480-487

Ämneskategorier

Kemiteknik

DOI

10.1016/j.carbpol.2016.05.107

PubMed

27474592