GCSE Biology - Food Tests Practicals

Подробнее о видео

⭐️ ⭐️

*** WHAT'S COVERED ***
1. Preparing a food sample for testing
* Grinding the food
* Dissolving in distilled water
* Filtering the solution
2. Benedict's test for sugars
* Testing for reducing sugars
* Using a water bath
* Observing colour changes (blue to green/yellow/brick-red)
3. Iodine test for starch
* Adding iodine solution
* Observing colour change (browny-orange to blue-black)
4. Biuret test for proteins
* Adding Biuret solution (or potassium hydroxide and copper sulfate for Edexcel)
* Observing colour change (blue to pink/purple)
5. Sudan III test for lipids
* Adding Sudan III stain solution
* Observing the formation of a red-stained top layer
6. Emulsion test for lipids (Edexcel specific)
* Adding ethanol and shaking
* Adding distilled water
* Observing a cloudy white colour (emulsion)

*** CHAPTERS ***
0:00 Introduction to Food Tests
0:36 Preparing a Food Sample
1:12 Benedict's Test (Sugars)
2:17 Iodine Test (Starch)
2:56 Biuret Test (Proteins)
3:34 Sudan III Test (Lipids)
4:07 Emulsion Test (Lipids - Edexcel)

*** PLAYLISTS ***










#GCSE #Biology #study