Fats and oils
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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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Fats and oils

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Fats and oils

Fats and oils


Fats and oils1

Fats and oils

Naturally occuring

Animalfat

Vegetableoil

Marine oil

sunflower oil

coconut oil

cod liver oil

whale oil

lard

suet


Fats and oils2

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


Fats and oils3

Fats and oils

The other components of fat molecules are carboxylic acids

such as

Stearic acid

Systematic name is octadecanoic acid


Fats and oils4

Fats and oils

Fats and oils are ESTERS of glycerol and

long chain carboxylic acids


Fats and oils5

Fats and oils

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 and oils6

Fats and oils

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


Fats and oils7

Fats and oils

Oil

Double bonds in oil make the molecule less compact.

Less tightly packed molecules make oils liquid.

Fat

Fat molecules pack together more tightly,

making fats solid at room temperature.


References

References

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):

RasTop www.geneinfinity.org/rastop/

RasMol home page http://openrasmol.org/

An internet search for ‘rasmol’ or ‘chime’ will identify many potential sources of interactive molecular images.


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