Contents
Key Stage 3
Meaning
Starch is a complex carbohydrate found in food.
About Starch
- Starch is made of many glucose molecules bonded together.
- Starch is an important part of a balanced diet.
Starch Molecule
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| A starch molecule made of many smaller glucose molecules. |
Starch in Foods
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| Bread makes part of a balanced diet because it has a lot of starch used for energy. | A balanced diet might contain pasta as it is mostly starch. | Potatoes are full of starch. | Rice is mostly starch with very few other nutrients. |
Testing for Starch
- Starch can be detected using Iodine Solution.
Method
- 1. A small sample of food is placed on a spotting tile.
- 2. A drop of Iodine Solution is added to the food sample.
- 3. If the Iodine Solution turns from orange to blue-black then the food contains starch.
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| Iodine Solution is an orange liquid. When the Iodine Solution is added to starch the Iodine Solution turns from orange to blue-black. |
Key Stage 4
Meaning
Starch is a polysaccharide found in food.
About Starch
- Starch is a polymer made of many glucose monomers which join together in a polymerisation reaction.
- Starch is an important part of a balanced diet.
- Starch can be broken down into shorter chains by amylase.
Starch Molecule
|
| A starch molecule made of many smaller glucose molecules. |
Starch in Foods
|
|
|
|
| Bread makes part of a balanced diet because it has a lot of starch used for energy. | A balanced diet might contain pasta as it is mostly starch. | Potatoes are full of starch. | Rice is mostly starch with very few other nutrients. |
Testing for Starch
- Starch can be detected using Iodine Solution.
Method
- 1. A small sample of food is placed on a spotting tile.
- 2. A drop of Iodine Solution is added to the food sample.
- 3. If the Iodine Solution turns from orange to blue-black then the food contains starch.
|
| Iodine Solution is an orange liquid. When the Iodine Solution is added to starch the Iodine Solution turns from orange to blue-black. |