2-4 C atoms short chain fatty acids 6-12 C atoms medium chain fatty acids 12-20 C atoms long chain fatty acids >22 C atoms very long chain fatty acids saturated fatty acids Lipid Melt. Common Name Systematic Name Structural Formula Numb.Point Propionic acid Propanoic acid CH2CH,COOH C3:0 Butyric acid Butanoic acid CH3(CH2)2COOH C4:0 Lauric acid Dodecanoic acid CH3(CH2)10COOH C12:0 44°℃ Myristic acid Tetradecanoic acid CH3(CH2)12COOH C14:0 52°C Palmitic acid Hexadecanoic acid CH3(CH2)14COOH C16:0 63C Stearic acid Octadecanoic acid CH3(CH2)16COOH C18:0 70°C Arachidic acid Eicosanoic acid CH3(CH2)1sCOOH C20:0 75°℃ Behenic acid Docosanoic acid CH3(CH2)20COOH C22:0 81C Lignoceric acid Tetracosanoic acid CH3(CH2)22COOH C24:0 84°℃ Common Name Systematic Name Structural Formula Lipid Numb. Melt. Point Propionic acid Propanoic acid CH3CH2COOH C3:0 Butyric acid Butanoic acid CH3 (CH2 )2COOH C4:0 Lauric acid Dodecanoic acid CH3 (CH2 )10COOH C12:0 44°C Myristic acid Tetradecanoic acid CH3 (CH2 )12COOH C14:0 52°C Palmitic acid Hexadecanoic acid CH3 (CH2 )14COOH C16:0 63°C Stearic acid Octadecanoic acid CH3 (CH2 )16COOH C18:0 70°C Arachidic acid Eicosanoic acid CH3 (CH2 )18COOH C20:0 75°C Behenic acid Docosanoic acid CH3 (CH2 )20COOH C22:0 81°C Lignoceric acid Tetracosanoic acid CH3 (CH2 )22COOH C24:0 84°C 2 – 4 C atoms = short chain fatty acids 6 – 12 C atoms = medium chain fatty acids 12 –20 C atoms = long chain fatty acids > 22 C atoms = very long chain fatty acids saturated fatty acids