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What happens chemically and biologically when iodine reacts with GLYCOGEN and turns a reddish-brown color?

What happens chemically and biologically when iodine reacts with GLYCOGEN and turns a reddish-brown color?

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Answer:

Glycogen is a Non reducing sugar because of it is having the acetal linkages. The Glycogen is from helical coils. The Iodine atoms can fit in to the helices to form a Glycogen-Iodine complex. Due to the formation of the complex it turns in to the reddish-brown.

The colour is cuased by Charge transfer, Generally the Glycogens acts as Charge donors and Iodine (or) polyiodides acts as an acceptors.

The complexes adsorbs the different wave lengths of the light that leads to the formation of the colour.

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