To check for starch in food, iodine solution is employed. A bright orange-brown hue can be seen in a solution of potassium iodide (KI) and iodine (I2) in water. if starch-containing samples, such as bread, are included in the sample.
- The bread's colour transforms to a rich blue.
- The starch and the iodine do exchange some electrical charges.
- The spacings between energy levels are altered as a result, changing the electron configurations. The complex gets its vivid blue colour from the additional spacings, which preferentially absorb visible light.
- Iodine is frequently used as an indication to check for starch. When starch reacts with the light orange-brown iodine solution, the colour changes to blue-black. This implies that the food item contains carbs.
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