2.1.4 Cyclic fatty acids
These acids are rather uncommon but, nevertheless, examples provide important metabolic inhibitors. The ring structures are usually either cyclopropyl or cyclopentyl. Cyclopropane and cyclopropene fatty acids are produced by many bacteria and are also found in some plants and fungi (Table 2.4).
A great range of keto, hydroxy and epoxy acids has been identified in recent years. The most widely occurring epoxy acid is vernolic acid. Hydroxy acids do not occur very extensively although they occur generally in some sphingolipids. They are
Table 2.3 Some naturally occurring polyunsaturated fatty acids
No. of carbon Systemic name atoms
Dienoic acids 18
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