Crystalline forms of cellulose in the silver tree fern Cyathea dealbata

摘要: 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 those lignin--hemicellulosic matrix by exploiting differences in proton rotating-frame relaxation time constants. Heights signals at 90.2 and 88.5 ppm, assigned C-4 Iα Iβ, indicated similar proportions two crystalline forms. This observation conflicts suggestion that plant celluloses can be grouped into categories Iα-rich Iβ-rich.