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Starch Stats

based on 6 ratings
Author: Nancy Rogers Bosse
Type
Chemistry, Food Science 
Grade
5th – 8th grades 
Difficulty of Project
Moderate 
Cost

Less than $20.00 

Safety Issues

Caution must be used when handling iodine. 

Material Availability

Readily available or easily purchased from the grocery store 

Approximate Time Required to Complete the Project

One to two hours to collect the data; one day to prepare the science fair display 

Objective

To determine which foods contain starch 

Materials and Equipment

  • ¼ cup of 10 different foods such as rice, potato, apple, carrot, broccoli, pasta, nuts, milk, cereal, and ice cream (other foods may be substituted for these foods)
  • 10 bowls
  • 10 spoons
  • Water
  • 10 coffee filters
  • Funnel (large enough to fit a coffee filter)
  • 10 clear plastic cups
  • Masking tape
  • Pen
  • 10 drops of iodine
  • medicine dropper 

Background Information

Grains, potatoes, corn, and beans are sources of starch. Fruits and vegetables also have starch. All starch is basically a glucose or sugar. Some starches such as breads and candies are typically high in calories and produce a quick energy high but are not able to sustain the energy level. Pasta, however, is different. Pasta breaks down in the body at a slower rate allowing the energy use to be prolonged. That is why athletes will eat a lot of pasta before an athletic event. Most starches are fairly inexpensive so they can be used to feed large amounts of people with less money. 

In this investigation, several food items are tested to determine whether they contain starch.  

Terms, Concepts, and Questions to Start Background Research

Terms

starch: white, odorless, tasteless carbohydrate; can be converted to energy 

carbohydrate: a type of compound that includes sugars and starches and serves as an energy source 

glucose: a sugar in many fruits  

Concepts

Starch is a carbohydrate that makes energy in the body.  

Research Questions
  • What foods contain starch?
  • How does starch help the body? 

Experimental Procedure

  1. Gather the necessary materials.
  2. Crush each of the 10 foods selected in a bowl. Add water and mix until each form a soupy mixture.
  3. Place a coffee filter in the funnel. Pour one of the soupy mixtures into funnel. Put the funnel over a clear plastic cup. Add water. Fill the cup a quarter of the way full. Using the masking tape, label the cup.  
  4. Using the medicine dropper, put one drop of iodine into the plastic cup. Record the results. If the mixture turns dark blue, the food contains starch.
  5. Repeat Steps 3 – 4 for all the food samples.  

Bibliography

Articles

“What You Need to Know About Complex Carbohydrates” by Laura Dolson at About.com 

“Cereals, Foods Rich in Starch” at http://www.earthlypursuits.com/FoodSaveShare/FoodSaveShare5.htm 

“Sweet, Sweet Carb” at http://www.chem4kids.com/files/bio_carbos.html 

“Carbohydrates” at http://www.healthcentral.com/diabetes/diet-000042_3-145.html

 

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