The branches in amylopectin constitute about 5% of the molecule, which results in a very complex molecular structure. Short chains of amylopectin form double-helices, which crystalize and contribute to the semi-crystalline nature of the starch granules [11].

Does starch have a helical structure?

Starch: Amylose and Amylopectin

Amylose consists of a linear, helical chains of roughly 500 to 20,000 alpha-D-glucose monomers linked together through alpha (1-4) glycosidic bonds. ... In contract to amylose, amylopectin is branched.

Does starch form complex analysis?

Starch forms a very dark blue-black complex with triiodide. However, the complex is not formed if only iodine or only iodide (I⁻) is present. ... This is due to the insolubility of the starch–triiodide complex which may prevent some of the iodine reacting with the titrant.