Eicosatetraenoic acid 4163527 214587428 2008-05-24T07:35:16Z MER-C 1749459 swap reference for peer-reviewed journal '''Eicosatetraenoic acid''', ETA, designates any straight chain 20:4 [[fatty acid]]. :''See'' [[essential fatty acid#Nomenclature]] for nomenclature. Two isomers, both of them [[essential fatty acid]]s, are of particular interest: * all-''cis'' 5,8,11,14-eicosatetraenoic acid is an [[omega-6 fatty acid|ω-6 fatty acid]] with the trivial name '''[[arachidonic acid]]'''. It is formed by a desaturation of [[dihomo-gamma-linolenic acid]] 20:4 ω-6. * all-''cis'' 8,11,14,17-eicosatetraenoic acid is an [[omega-3 fatty acid|ω-3 fatty acid]]. It is an intermediary between [[stearidonic acid]] (18:4 ω-3) and [[eicosapentaenoic acid]] (EPA, 20:5 ω-3) Some chemistry sources define 'arachadonic acid' to designate any of the eicosatetraenoic acids. However, almost all writings in biology, medicine and nutrition limit the use the term 'arachidonic acid' to all-''cis'' 5,8,11,14-eicosatetraenoic acid (ω-6). ETA is found in green-lipped mussel, which may improve osteoarthritis.<ref>{{cite journal|title=Evaluating Complementary Therapies for Canine Osteoarthritis Part I: Green-lipped Mussel (Perna canaliculus)|journal=Evidence-based Complementary and Alternate Medicine|author=Hielm-Björkman et al|doi=10.1093/ecam/nem136|url=http://ecam.oxfordjournals.org/cgi/content/full/nem136v1|date=2007-10-29}}</ref> ==References== {{Reflist}} ==See also== *[[List of omega-3 fatty acids]] *[[Omega-3 fatty acids]] *[[Omega-6 fatty acids]] [[Category:Fatty acids]] {{biochem-stub}}