Curdlan gels by the diffusion method have a multi-layered structure.
Curdlan with a helical structure associate to form fibrils in the gel.
The gelation is due to cross-linking of the fibrils with Ca2+ in the outer gel layers.
The gelation is due to aggregation of the fibrils in the inner gel layers.
The inhomogeneous structure of μm is formed in turbid gel layers.