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Native cellulose: a composite of two distinct crystalline forms.
Science (New York, N.Y.)
|January 20, 1984
Summary
High-resolution solid-state carbon-13 nuclear magnetic resonance reveals two distinct crystalline forms in native celluloses. These forms are prevalent in different cellulose types, differentiating bacterial/algal from higher plant sources.
Area of Science:
- Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
- Materials Science
- Biochemistry
Background:
- Cellulose, a biopolymer, exhibits diverse crystalline structures.
- Solid-state carbon-13 NMR spectroscopy is sensitive to the local environment of carbon atoms.
- Previous studies have indicated structural variations in native celluloses.
Purpose of the Study:
- To investigate the multiplicities of resonances in chemically equivalent carbons within native celluloses.
- To differentiate crystalline forms of cellulose using high-resolution solid-state carbon-13 NMR.
- To correlate spectral patterns with the biological source of cellulose.
Main Methods:
- High-resolution solid-state carbon-13 nuclear magnetic resonance spectroscopy.
- Analysis of resonance multiplicities in carbon spectra.
- Comparison of spectral data from various native cellulose samples.
Main Results:
- Observed variations in resonance multiplicities are consistent with distinct crystalline structures.
- One crystalline form dominates in bacterial and algal celluloses.
- A second crystalline form is dominant in celluloses from higher plants.
Conclusions:
- Native celluloses exist in at least two distinct crystalline forms.
- The distribution of these crystalline forms is source-dependent.
- Solid-state carbon-13 NMR is a powerful tool for characterizing cellulose polymorphism.
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