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© Malcolm G Stephen 2004 - PowerPoint PPT Presentation


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© Malcolm G Stephen 2004. sunflower oil coconut oil. cod liver oil whale oil. lard suet. Naturally occurring. Animal fat. Vegetable oil. Marine oil. 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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Presentation Transcript
slide2

sunflower oil

coconut oil

cod liver oil

whale oil

lard

suet

Naturally occurring

Animalfat

Vegetableoil

Marine oil

slide3

Fats and oils are built from an alcohol with three -O-H groups.

glycerol

Systematic name is propane-1,2,3-triol

slide4

The other components of fat molecules are carboxylic acids

such as

Stearic acid

Systematic name is octadecanoic acid

slide6

Removal of water in the condensation reaction gives a fat-

The structural formula shown above suggests that the fat

molecule is shaped like an E, but the molecule is actually

shaped more like this-

slide7

Fats are mainly built from carboxylic acids with C-C single bonds.

Stearic acid in beef fat

notice that with only C-C bonds the molecule is “straight”

slide8

Oils have some C=C bonds in the carboxylic acids from which they are made.

Oleic acid in olive oil

notice that the shape of the molecule is distorted by the C=C bond

slide9

Fat

Fat molecules pack together tightly, making fats solid at room temperature.

Oil

Double bonds in oil make the molecule less compact.

Less tightly packed molecules make oils liquid.

slide10

Converting C=C bonds to C-C will change oils into fats.

This is done by addition of hydrogen (hydrogenation) using a nickel catalyst.

in oil

in fat