NEET BIOLOGY

Detailed explanation-1: -The iodine test is based on the fact that polyiodide ions form colored adsorption complex with helical chains of glucose residue of amylase (blue-black), dextrin (black), or glycogen (reddish-brown). Monosaccharides, disaccharides, and branched polysaccharides like cellulose remain colorless.

Detailed explanation-2: -Lugol’s iodine test is a commonly used diagnostic tool when colposcopically assessing the cervix in order to identify cervical dysplasia [10, 13, 22].

Detailed explanation-3: -You can use an iodine solution to detect the presence of complex carbohydrates. The yellow-orange iodine will turn blue-black as it reacts with starch. (The iodine solution will show no reaction with simple carbohydrates or sugars.) *Note: Iodine may stain when it comes into contact with the skin.

Detailed explanation-4: -(e) Iodine Test: This test is only given by starch. Starch reacts with iodine solution forms complex blue colour solution. On heating the blue colour disappears and on cooling the blue colour reappears.

Detailed explanation-5: -Lugol’s iodine solution is a starch indicator, chemical reagent, and biological stain. This chemical stains carbohydrates in plant and animal specimens brown or blue-black and stains glycogen red. This 30 ml bottle is an aqueous solution of 1.8% iodine and 3.0% potassium iodide. This iodine solution is water-based.