nt 2 10 15 POST-LAB QUESTIONS 1. An amylose solution is colorless. The iodine so

Question

nt 2 10 15 POST-LAB QUESTIONS 1. An amylose solution is colorless. The iodine solution is reddish-brown. Yet when you combine these two solutions, you observe an intense blue color. What changes in molecular structures give this coloration? 2. The hydrolysis of starch was stopped when the iodine test no longer gave a blue color. Does this mean that the starch solution was completely hydrolyzed to glucose? Explain. 3. Which hydrolysis of the starch is faster? On the basis of this experiment estimate what will happen to the digestion of a piece of bread (containing starch) when you chew it thoroughly?

Explanation / Answer

Ans 1 :

The amylose structure has several glucose units connected through acetal linkages. When it is combined with the iodine solution , the iodine molecule gets inside the amylose coil. The iodine atoms get aligned linearly in the center of amylose coil . The transfer of some charges occur between amylose and iodine which create energy level spacings, that absorbs part of visible light spectrum , and giving an intense blue color.

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