Figure 3From: Effects of alkaline or liquid-ammonia treatment on crystalline cellulose: changes in crystalline structure and effects on enzymatic digestibility13C CPMAS solid-state NMR spectra. (A) Original cellulose I and (B) cellulose II for various cellulose samples. (a) Avicel, (b) α-cellulose, (c) cotton linters, and (d) corn stover, (e) amorphous cellulose. CPMAS: cross polarization and magic angle spinning solid-state; NMR: nuclear magnetic resonance.Back to article page