1) Iodine test.
Iodine test distinguishes starch. It helps in distinguishing a polysaccharide from monosaccharide, disaccharides and other polysaccharides. The test is also called iodine staining. The iodine reacts with coiled polymer molecules and turn bluish black. Non-coiled starch does not react with iodine thereby no bluish color observed. A positive result is when there is the presence of the bluish black color.
1. Put two drops of the solutions to be tested in three different test-tubes. 2. Add two drops of the IKI reagent to each of the tubes containing different sugar solutions. 3. Keep the sugar at room temperature ...