Abstract
Solid-state 13C NMR spectroscopy was used to characterize fibrous material cut from the midrib of a fern frond. Signals associated with cellulose crystallites were separated from those associated with the lignin--hemicellulosic matrix by exploiting differences in proton rotating-frame relaxation time constants. Heights of signals at 90.2 and 88.5 ppm, assigned to C-4 in cellulose Iα and Iβ, indicated similar proportions of the two crystalline forms. This observation conflicts with a suggestion that plant celluloses can be grouped into the two categories of Iα-rich and Iβ-rich.
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NEWMAN, R.H. Crystalline forms of cellulose in the silver tree fern Cyathea dealbata. Cellulose 4, 269–279 (1997). https://doi.org/10.1023/A:1018496025143
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DOI: https://doi.org/10.1023/A:1018496025143