Question

1) Which experimental spots were positive for starch?

2) Which pH condition or conditions allowed complete chemical digestion of starch with salivary amylase? Does this pH condition simulate the normal pH conditions of the human body?

Answer 1

Ans.1

Iodine test is positive for starch, in this test, to add iodine solution (yellow/brown) and look for a colour change. In the presence of starch, iodine turns a blue/black colour. It is possible to distinguish starch from glucose.using this iodine solution test.

Ans.2

pH-->6.8 to 7.0 pH in oral cavity

In the buccal cavity or oral cavity the acinar cells produce an enzyme called ptyalin, or salivary amylase, which is involved in the digestive process initiating the hydrolysis of starch present in food. The pH for optimal activity of ptyalin is 6.8 to 7.0 pH

A normal blood pH level is 7.40 on a scale of 0 to 14, where 0 is the most acidic and 14 is the most basic. This value can vary slightly in either direction. So we can say that 6.8 to 7.0 pH Does the pH condition simulate the normal pH conditions of the human body.