Properties of Lipids Flashcards
List the six properties of lipids
Solubility Hydrogenation Plasticity Affected by heat Rancidity Emulsions
Describe the solubility property of lipids
Lipds are insoluble in water
Lipids are soluble in solvent e.g. ether or benzene
What solvents are lipids soluble in?
Ether or benzene
What are lipids insoluble in?
Water
What is hydrogenation?
The process of forcing hydrogen through the double bond of an unsaturated fatty acids
What happens to an unsaturated fatty acid when it is hydrogenated?
It becomes a saturated fat and changes from a liquid to a solid
What is the culinary application of hydrogenation?
The production of margarine
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
What three headings are used when describing the affect of heat on lipids
Melting point
Smoke point
Flash point
What happens to lipids at melting point?
Solids melt into liquids
At what temperature does melting point occur?
30-40 degrees Celsius
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
At what temperature do fats reach smoke point?
200 degrees Celsius
At what temperature do oils reach smoke point?
250 degrees Celsius
What happens to lipids at flash point?
2
The decomposition of the lipids continues
Lipids spontaneous burst into flames
