The solid state 13C CP/MAS (Cross-Polarization and Magic Angle Spinning) NMR experiment was scanned using solid-state 13C CP/MAS NMR (AVANCE III 500, Bruker Co., Ltd., Switzerland) at
125.7 MHz for the 13C nucleus according to the method of Mahadevamma et al. (2003). About 200–300 mg of sample was accumulated with a spectral width of 40 kHz at a magnetic field of Ultra Shield Plus SB (54 mm) 11.7467T. The relative degrees of crystallinity of sample were processed using PeakFit software version 4.12.