fats are also known as triglycerides or lipids carbon, hydrogen & oxygen (have many hydrogens...
TRANSCRIPT
Fats are also known as TRIGLYCERIDES or LIPIDS
Carbon, Hydrogen & Oxygen (have many hydrogens compared to
oxygen)
Lipids (oils,fats,waxes)
(STORAGE) twice as much energy than carbohydrates
insoluble in water
Soluble in alcohol
Can be solid (fat) or liquid at room temperature (liquid)
Properties
Store of energy
Insulation
Protecting Organs
Buoyancy
Found in cell membranes
Functions of Fat
Triglycerides
GLYCEROL FATTY ACID
GLYCEROL + 3 FATTY ACIDS TRIGLYCERIDE + 3 WATER
Formation of lipid molecule
The three fatty acids are joined to glycerol by condensation reactions
R-COOH
COOH = carboxylic acid R = hydrocarbon chain
Saturated Fatty Acids Unsaturated Fatty acids
Fatty acids (FA’s)
Saturated or Unsaturated?
Lipids can be hydrolysed into fatty acids and glycerol by:
heating with acid or alkali.
using the enzyme lipase at an optimum temperature and pH.
Hydrolysis of lipids
This involves: The sample is placed into a test tube with
2cm3 of ethanol; shake the mixture so that the fat dissolves; add this to water in another test tube and
mix the contents; a white or cloudy emulsion of fat
droplets indicates lipid is present.
Emulsion test for lipids
PhospholipidsGLYCEROL + 2 FA’s + Phosphate Phospholipid + 3 Water
Formation of Phospholipid
Representation of Phospholipid
Phospholipids in water
Phospholipids in cell membrane.
1. Name two functions of lipids. 2. What does a triglyceride consist of? 3. Draw glycerol. 4. What does the R group on the fatty acid
represent? 5. What is the difference between a
saturated and an unsaturated fatty acid?
Recap questions.
6. What components make up a phospholipid?
7. What term is used to describe the phosphate head and its “relationship” with water?
8. Where are phospholipids mainly found? 9. How do we test for the presence of lipids?
Recap questions.