Iodine–starch test

Iodine–starch test
Schematic view of I3− ions embedded in amylose helix
ClassificationColorimetric method
AnalytesStarch

The iodine–starch test is a chemical reaction that is used to test for the presence of starch or for iodine. The combination of starch and iodine is intensely blue-black. The interaction between starch and the triiodide anion (I−
3) is the basis for iodometry.

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