Question

What is the role of an indicator? Predict how the glucose test strips and iodine would react with the following foods: Grape Tomato Summer squash Orange Bell pepper

Answer 1

The main role of an indicator is to establish the equivalence point when two substance has reached its neutralization process. The purpose of an indicator is to determine how acidic or basic the product or solution is. Indicator solutions work by actually reacting with the components of food that they test for, creating a new substance of a different color. This is a chemical reaction.If the substance that they test for is not present in the food, there will be no reaction, and therefore no color change.  The test strips will be more likely to be dark blue or black for  Grape, Tomato, Summer squash, Orange Bell pepper as they all contain starch. Color intensity may vary depending on the level of starch found in the samples. 

Answer 2

Indicators are defined as the substances or chemicals that change color when added to acidic or basic solutions. The glucose solution turns into green color, whereas the iodine solution turns into a blue-black color in the presence of starch or sugar.

Indicators are the substances, which change color in the presence of acidic and alkaline substances. The glucose strip converts or indicated green color in the presence of sugar or glucose. Iodine solution turns dark blue or black in the presence of starch. The following substances will change color, such that:

• grapes, tomato, summer squash, and orange bell pepper will indicate a blue-black color due to the presence of starch. The intensity of the color changes depending on the levels of acidity or basicity.
• Similarly, with glucose test strip, the food substances mentioned will indicate the shades of green. The more the content of glucose, the more darker shade of green will be detected.

Therefore, the presence of starch in food items can be indicated by iodine and glucose strip solution.

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