Fats and oils. Fats and oils. Naturally occuring. Animal fat. Vegetable oil. Marine oil. sunflower oil coconut oil. cod liver oil whale oil. lard suet. Fats and oils. Fats and oils are built from an alcohol with three -O-H groups. glycerol. Systematic name is propane-1,2,3-triol.
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cod liver oil
Fats and oils are built from an alcohol with three -O-H groups.
Systematic name is propane-1,2,3-triol
The other components of fat molecules are carboxylic acids
Systematic name is octadecanoic acid
Fats and oils are ESTERS of glycerol and
long chain carboxylic acids
Removal of water in the condensation reaction gives -
The molecular formula shown above suggests that the fat
molecule is shaped like an E, but the molecule is actually
shaped more like this:
Fats are mainly built from carboxylic acids with
C-C single bonds.
Stearic acid in beef fat
Oils have some C=C bonds in the carboxylic acids
from which they are made.
Oleic acid in olive oil
Double bonds in oil make the molecule less compact.
Less tightly packed molecules make oils liquid.
Fat molecules pack together more tightly,
making fats solid at room temperature.
Prepared by Malcolm Stephenof Mackie Academy, Stonehaven, Kincardineshire
He used free software called ‘RasTop’ to draw the ball and stick molecular images. This software can also be used to produce pdb files, interactive visualisations of the molecules.
Web sites (checked 17/07/03):
RasMol home page http://openrasmol.org/
An internet search for ‘rasmol’ or ‘chime’ will identify many potential sources of interactive molecular images.