In biochemistry, a fatty acid is defined as a long aliphatic chain with a carboxylic acid functional group, either saturated or unsaturated. Fatty acids can be categorized into several groups according to the length of the chains: short-chain fatty acids (SCFA) with aliphatic tails of 2-6 carbons; medium-chain fatty acids (MCFA) with aliphatic tails of 6–12 carbons; long-chain fatty acids (LCFA) 13 to 21 carbons in aliphatic tails and Very long chain fatty acids (VLCFA) with aliphatic tails longer than 22 carbons. Fatty acids can also be divided into 2 groups according to whether they have double bonds between carbon atoms, unsaturated fatty acids and saturated fatty acids. There are one or more double bonds between carbon atoms in unsaturated fatty acids, while saturated fatty acids are saturated with hydrogen and have only single bonds and without double bonds. medium chain and long chain fatty acid