Fatty Acid

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I. Introduction:

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Bi209

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Fatty acids:

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Fatty acids:RCOOH

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have the general structure of a long hydrocarbon chain (usually with a terminal

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carboxyl group).

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Most animal fatty acids have an even number of carbon atoms

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Fatty acids can display different levels of saturation

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dep ending on the number ofC-C

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bonds in the chain

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Sources of Fatty Acids: Fatty acids can be either

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obtained from the diet or jnade in the

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body denovo.

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Essential fatty acids:

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The body does not have the metabolic pathways to make all fatty acids and

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therefore

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some must be obtained from the diet (essential fatty acids). Mammals cannot introduce

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C-C bonds past C9 of the hydrocarbon chain

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Linoleic (C-C at C9 and C12) and linolenic acids (C-C at C9

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C12 and C15) are

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essential fatty acids

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a) Linoleic (18:2 A9’12

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o6):

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18

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18

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13 12

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CH3(CH2)4CH-CH-CH2-CH-CH-(CH2) 7 COOH

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It is the most imp ortant since other essential fatty acids can be synthesized horn it in the

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body.

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b) a linolenic (18:3 A9°12°15

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o3):

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16 15

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10 9

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13 12

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10 9

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1

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CH3-CH2-CH-CH-CH2CH=CH-CH2-CH-CH-(CH2) 7- COOH

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134

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y Linolenic acid (18: 3: 6

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9

Question 35

CH3-(CH2)4-CH-CH-CH2-CH-CH-CH2-CH-CH-(CH2)4-COOH