plant oils n.
Skip this Video
Loading SlideShow in 5 Seconds..
Plant oils PowerPoint Presentation
play fullscreen
1 / 9
Download Presentation

Plant oils - PowerPoint PPT Presentation

iago
120 Views
Download Presentation

Plant oils

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Plant oils Everyday emulsions

  2. Shake it up • How can we mix oil and water? • What will happen when we shake the tubes? • How could we make the separate liquids mix?

  3. Smooth operator • Texture of food is very important • Ice cream, mayonnaise etc. • Mixture of oil and water – don’t mix! • Can be persuaded • Very small droplets of oil • Spread throughout water • Emulsion • Milk

  4. Mayonnaise • Made from water and oil • Both runny • Mayonnaise is not runny…? • 3rd ingredient = egg yolk • Stops oil and water from separating • Emulsifier • Sauce stays thick and smooth

  5. Emulsifiers

  6. What is an emulsifier? • Challenge question – How does an emulsifier help to keep a sauce creamy and smooth?

  7. Making Mayo • Follow recipe to produce a tasty treat.

  8. Ice cream • Ice cream – even more complicated • Air is beaten in to produce a foam • Stabilisers and Thickeners added • Substances with molecules which trap air • Emulsifiers needed to keep water and fat together while they freeze • Water would freeze first = crunchy ice cream

  9. Emulsion paint • Emulsion paint is NOT an emulsion! • It is a powder suspended in a liquid • Colloid