Question

Each polysaccharide tested gives different colour results with the iodine test. Explain the reason?​

Answer 1

Answer:

Lugol's iodine yields a blue-black color in the presence of starch. Glycogen reacts with Lugol's reagent to give a brown-blue color. Other polysaccharides and monosaccharides yield no color change; the test solution remains the characteristic brown-yellow of the reagent

Explanation:

Iodine (iodine-potassium iodide, I2KI) staining distinguishes starch (a polysaccharide) from monosaccharides, disaccharides, and other polysaccharides. ... Therefore, a bluish black color is a positive test for starch, and a yellow-ish brown color (i.e., no color change) is a negative test for starch.

Answer 2

Explanation: Iodine (iodine-potassium iodide, I2KI) staining distinguishes starch (a polysaccharide) from monosaccharides, disaccharides, and other polysaccharides. ... Therefore, a bluish black color is a positive test for starch, and a yellow-ish brown color (i.e., no color change) is a negative test for starch.

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