Arrival Craft: Make origami Protein Channels. I found this fantastic craft online here. There are videos to help you!
Introduction: We need to eat a balanced diet, which means we need to eat different types of food.
We need: Carbohydrates, Proteins, Vitamins and Minerals and Fats.
Some foods obviously belong to one group or another, but other foods can be in several groups at once.
I have iodine, which we can use to test for starch; and bieuret solution, which we can use to test for protein.
We’re going to test some foods to see if they contain starch and / or protein.
Egg white is a good source of protein, so we’re going to use egg white and water to show the difference between a positive protein test and a negative protein test.
Individual Task: Test for proteins. (The Biuret reagent contains: Hydrated Copper sulphate, Potassium hydroxide solution, Potassium sodium tartrate) foodtesting
Children then mash up different foods with water and test them for protein.
They should also test a sample of only water – as a control.
Gather Together: Which of the foods contained protein?
Is that what you expected?
Break for drink and snack.
Second part: This is a potato – obviously, it’s going to contain starch. When I add iodine to it, the iodine goes blue, indicating the presence of starch. We’re going to use iodine to see which of these foods contain starch.
Give out worksheets for children to predict whether foods will contain starch. foodtesting