3.1.4 Morphology analysis
Scanning electron microscopy (100x and 3,000x) showed that the surface
of the GP is rough and irregular (Fig. 1D). It is speculated that this
phenomenon may be due to cross-linking and aggregation between molecular
chains. It is suggested that there is a strong interaction between the
molecules of the samples, and all of them are amorphous. In addition,
the GP contained a porous honeycomb structure, which may be formed by
the sublimation of ice crystals during freeze-drying or may be related
to the side chain of the polysaccharide.