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Flashcards in Properties of Lipids Deck (17)
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1

List the six properties of lipids

Solubility
Hydrogenation
Plasticity
Affected by heat
Rancidity
Emulsions

2

Describe the solubility property of lipids

Lipds are insoluble in water
Lipids are soluble in solvent e.g. ether or benzene

3

What solvents are lipids soluble in?

Ether or benzene

4

What are lipids insoluble in?

Water

5

What is hydrogenation?

The process of forcing hydrogen through the double bond of an unsaturated fatty acids

6

What happens to an unsaturated fatty acid when it is hydrogenated?

It becomes a saturated fat and changes from a liquid to a solid

7

What is the culinary application of hydrogenation?

The production of margarine

8

Describe the plasticity property of lipids?
(2)

Lipids can have properties of both a solid (saturated) and a liquid (unsaturated) fat.

Margarine is used in the creaming method as it has shape and structure but is soft and spreadable

9

What three headings are used when describing the affect of heat on lipids

Melting point
Smoke point
Flash point

10

What happens to lipids at melting point?

Solids melt into liquids

11

At what temperature does melting point occur?

30-40 degrees Celsius

12

What happens to lipids at smoke point?
(3)

Lipids begin it decompose and the glycerol separates from the fatty acids
A blue haze emerges
An acrid smelling compound known as acrolein is present

13

At what temperature do fats reach smoke point?

200 degrees Celsius

14

At what temperature do oils reach smoke point?

250 degrees Celsius

15

What happens to lipids at flash point?
(2)

The decomposition of the lipids continues
Lipids spontaneous burst into flames

16

At what temperature do fats reach flash point?

310 degrees Celsius

17

At what temperature do oils reach flash point?

325 degrees Celsius