(a: solid-liquid ratio; b: enzyme concentration; c: enzyme
hydrolysis temperature; d: enzyme hydrolysis time)
3.4. PCA of characteristic wave numbers ofcell
wall polysaccharides
The PCA scatter plots of the FT-IR spectra
of cell wall polysaccharides in the
1800-800 cm-1 region
is
shown in Fig. 6. The changes of infrared spectroscopy in the main
components of the cell wall (cellulose, hemicellulose, and pectin) under
different extraction conditions were explained by PC1 and PC2. PC1 and
PC2 indicated that cell wall residues were grouped or scattered in group
along the PC2 axis and PC1 axis, respectively. Not only reflected
difference between groups of cellulose, hemicellulose, and pectin, but
also reflected differences in the group of cellulose, hemicellulose, and
pectin affected by solid-liquid ratio, enzyme concentration, enzyme
hydrolysis temperature, and enzyme hydrolysis time.