🪥 Most naturally occurring fatty acids have an even number of carbons in their aliphatic chain. Example: oleic acid (18), stearic acid (18).
🪥 However, some fatty acids also have an odd number of carbons in their chain. They are known as odd-chain fatty acids (OCFA). Example: heptadecanoic (17) and pentadecanoic (15) acid that are found in dairy products.
🪥The biosynthesis of odd chain fatty acids is a little more complex than that of even chain fatty acids.

🪥The final product of odd chain fatty acids is a propionyl-CoA (C3) which necessitates two additional enzymes to assure a complete oxidation.