Why iodine is used in starch hydrolysis test?

Answer 1

Iodine in water solutions is usually colored strong enough so that its presence can be detected visually. However, close to the end point, when the iodine concentration is very low, its yellowish color is very pale and can be easily overlooked. Thus for the end point detection starch solutions are used.

Answer 2

starch iodide paste consist of water starch and iodine when the active drug is consumed in the sample,the reaction will produces iodine,which will give blue colour externally,internally there are chances it will react to the active

Answer 3

Starch, when mixed properly with iodine, results in a dark blue-black colouring. The iodine must first be mixed with iodide (extracted from potassium iodide) to create triiodide. The triiodide is added to water, and the solution is mixed with starch, which then produces the dark colouration.

The reason behind the change in colour is unknown, but scientists suspect that iodine gets clogged in coils of a soluble starch called "beta amylose". Beta amylose forces the iodine into a linear arrangement, and charge is transferred between the two, changing the energy levels. This then changes the frequency of the colouration. This process is speculation at this point, however.

Related link: https://en.wikipedia.org/wiki/Starch_indicator

Answer 4

Iodine is used in the starch hydrolysis test because it forms a blue-black complex with starch. When starch is present and not hydrolyzed, the iodine will turn the solution blue-black. If the starch is hydrolyzed into smaller sugars, the iodine will not form the blue-black complex, indicating a positive result for starch hydrolysis.

Answer 5

Because iodine imparts blue coloration with starch

Answer 6

it is used because if a substance (e.g. potatoe, banana) has starch in it the food will turn a blacky colour.

Answer 7

Together with Iodine,starch form a purple color complex.

Answer 8

Starch is a polysaccharide consisting of 2 components:

(1) Amylose

(2) Amylopectin

the first component that is Amylose react with iodine giving blue color.

Answer 9

Iodine, which is brown, gives a blue black colouration with starch. Thus, it is used in starch hydrolysis test to give an indication of the amount of starch present.