The higher structure of SPG-l-P was mainly composed of fiber sugar (C6H12O6) crystal and contained some non-crystal. The crystal system of SPG-l-P was monoclinic unit cell.

• SPG-1-P的高级结构为：SPG-1-P主要山C_6H_(12)O_6晶体组成，并含有一定量的非晶体成分；