Iodine–starch test

Iodine–starch test
Schematic view of I3− ions embedded in amylose helix
ClassificationColorimetric method
AnalytesStarch
A bottle of iodine solution used on apples to determine the correct harvest time. The chart shows the level of residual starch.
The cut surface of an apple stained with iodine, indicating a starch level of 4–5.

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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