Iodine Test: A chemical test used to detect the presence of starch in a sample.
Iodine solution is applied to the sample to observe a color change.
Positive Result for Starch: When iodine turns black or blue-black after application, indicating starch presence.
This color change confirms starch is present in the tested material.
Starch: A carbohydrate stored in plants as an energy reserve.
A polysaccharide composed of glucose units.
Iodine Solution: A reagent containing iodine and potassium iodide, used in starch testing.
It reacts with starch molecules to produce a color change.
Control Sample: A sample known to contain or not contain starch, used to compare results.
Ensures the accuracy of the test.
1. What does the iodine test with iodine solution primarily detect in a biological sample?
2. What indicates a positive result in the Fat Test with Ethanol?
3. What is the primary function of the Biuret test in biological samples?
Starch Test with Iodine — detection?
Presence of starch turns iodine blue-black.
Fat Test with Ethanol — positive?
Cloudy or milky emulsion indicates fats.
Protein Test with Biuret — result?
Purple color shows proteins are present.
Iodine Test — what detects?
Presence of starch in a sample.
Positive iodine test — color?
Black or blue-black.
Starch — role?
Energy storage in plants.
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