Scientists number the carbon atoms in fatty acid chains using the omega " " numbering system.
Let's try an example
Alpha linolenic acid is written like this: C18:3 3
It means that linolenic acid has 18 molecules of carbon in its chain and 3 double bonds.
3 means that the first double bond occurs at the third carbon from the methyl group (CH3), and the rest of the double bonds follows after a methylene spacer (CH2).
Realized by Laurence LIVERNAIS-SAETTEL, dietetian
© Copyright L. Livernais-Saettel 2000
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