Most of the aldehyde groups mainly located on the edge of the SG particles.

Oxidization might be not only carried out on surface, but also within granules of SG.

The surface hydroxyl numbers of CLSG decreased with increasing cross-linking degree.

Cross-linking degree was better calculated by determining the surface hydroxyl numbers.

l-Asparagine was adsorpted by DCLSG through forming sesbania gum based Schiff base.