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.