State the Problem:
What foods or vegetables contain starch?
Research the Problem:
Before we start, we need to know more about starch. Studies show that starch is white, odorless, tasteless carbohydrate powder soluble in cold water. This information will help us extract starch from our samples for more accurate tests. If we have any colorful fruit or vegetables for test, we can eliminate the chance of mixed colors and inaccurate tests. Starch also plays a vital role in the biochemistry of both plants and animals. It is made in green plants by photosynthesis, and is one of the main forms in which plants store food. Animals obtain starch from plants and store it as glycogen. Both plants and animals convert starch to glucose when energy is needed. Commercially, starch is made chiefly from corn and potatoes.
Starch is a substance in most fruits and vegetables, which means that it is most likely in the vegetable and fruit samples. Since starch is an inexpensive and widely available food product, it is being used as a food additive in many food products.
In order to perform this project, we must use Iodine solution as a reagent for starch. One drop of this solution on any sample can detect starch by changing the color of the tested area to dark blue.
We will be using the following samples:
Fruits and Vegetables
Procedure: We crush the wet samples, add cold or room temperature water and filter the solution to get a clear liquid. Next, test the samples of the clear liquid for starch and record the result.
Now, Analyze your data and come up with a conclusion.
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