Continuous gradient temperature Raman spectroscopy from −100 to 40 °C yields new molecular models of arachidonic acid and 2-Arachidonoyl-1-stearoyl-sn-glycero-3-phosphocholine

Novel, unique 3D structures for AA and 1-18:0, 2-20:4n-6 phosphatidyl choline reveal that AA is not symmetric as a free fatty acid, and it changes significantly when in the sn-2 phospholipid position. Further, different CH and CH2 sites are unequally elastic and nonequivalent.175