Properties of Lipids - Emulsions Flashcards Preview

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Flashcards in Properties of Lipids - Emulsions Deck (11)
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1

What is an emulsion?

When two immiscible liquid are forced together

2

What are the two different types of emulsions?

Temporary emulsions
Permanent emulsions

3

What are emulsions normally composed of?

Oil in water
Water in oil

4

Give an example of an oil in water emulsion

Milk

5

Give an example of a water in oil emulsion

Butter

6

What is a permanent emulsion?

An emulsion made when oil and water are forced together permanently in the presence of an emulsifier

7

Give an example of a permanent emulsion

Mayonnaise = oil and vinegar + emulsifier

8

What emulsifier is used in mayonnaise?

Lecithin from egg yolks

9

What is a temporary emulsion?
(2)

An emulsion made when oil and water are forced together by shaking
This emulsion is temporary and will therefore separate when left standing

10

Give an example of a temporary emulsion

French dressing = oil and water + shaking motion

11

How does an emulsifier join an oil and a water together?
(3)

An emulsifier has a hydrophilic head and a hydrophobic tail
The hydrophilic head attaches to the water or vinegar while the hydrophobic tail attaches to the oil
This prevents the oil and water/vinegar from separating