Solid state 13C NMR spectrum of Avicel PH-101. (a) Whole spectrum showing the assignment of peaks to the carbons in a glucopyranose repeat unit and (b) sub-spectrum showing peaks assigned to the C4 in cellulose. The CI is calculated by x/(x+y).
Park et al. Biotechnology for Biofuels 2010 3:10 doi:10.1186/1754-6834-3-10