Fats and Protein Tests
A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.
Testing for Fats
- Chop up each food.
- Add ethanol to a depth of 2 cm.
- Shake the food and ethanol gently.
- Pour some cold water into a second test tube to a depth of 5 cm.
- Pour a little of the ethanol that has been mixed with the food into the test tube of cold water.
- If fat is present in the food, a white cloudy layer will from in the cold water.
Testing for Protein
- Chop up each food.
- Add a a small quantity of food sample to a teat tube and add an equal quantity of sodium hydroxide solution.
- Shake the tube gently.
- Add a drop of copper sulfate solution.
- Look for a purple colour. This indicates the presence of protein.
- If a purple colour is not seen, repeat steps 4 and 5. If the purple colour does not appear after a few drops of copper sulfate solution have been added, stop the test and record protein as absent.
This is also called the Biuret Test for protein. The Biuret solution contains sodium hydroxide and copper sulfate.
Check out our most popular games!
Fraction Concoction Game:
Master fractions in the lab: mix, add, and subtract beakers to create the perfect concoction!
Fact Family Game:
Complete fact families and master the link between addition & subtraction and multiplication & division.
Number Bond Garden:
Clear the board by matching number pairs that sum to ten in this garden-themed mental math puzzle.
Online Addition Subtraction Game:
Practice your addition and subtraction skills to help the penguin find its mummy.
Penguin Solitaire
Penguin Solitaire is a fun game that aims to move all cards to the foundations to build four full sequences. There are two versions here: Penguin (Tuxedo) and Penguin (Original).
We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.