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Draw the structure of docosahexaenoic acid (22:6Δ4,7,10,13,16,19) and indicate what type of omega fatty acid it is.
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10. Lipids
Omega-3 Fatty Acids
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Which of the structures below is an example of an omega-3 polyunsaturated fatty acid?
A
B
C
D
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Identify the characteristic of an omega-3 fatty acid: Omega-3 fatty acids have a double bond at the third carbon from the methyl end (omega end) of the fatty acid chain.
Examine structure A: Count the number of carbons from the methyl end to the first double bond. Structure A has a double bond at the third carbon from the omega end.
Examine structure B: Count the number of carbons from the methyl end to the first double bond. Structure B has a double bond at the ninth carbon from the omega end.
Examine structure C: Count the number of carbons from the methyl end to the first double bond. Structure C has a double bond at the third carbon from the omega end.
Examine structure D: Count the number of carbons from the methyl end to the first double bond. Structure D has a double bond at the sixth carbon from the omega end.
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