Rumenic acid

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Rumenic acid
Rumenic acid
Rumenic acid forms in the rumen of cows
Chemical name (9Z,11E)-octadeca-9,11-dienoic acid
Chemical formula C18H32O2
Molecular mass 280.445 g/mol
CAS number ?
Density ? g/cm3
Melting point ? °C
Boiling point ? °C
Disclaimer and references

Rumenic acid is a conjugated linoleic acid (CLA) found in the fat of ruminants and in dairy products. It is a omega-7 trans fat. Its lipid shorthand name is cis-9, trans-11 18:2 acid. The name was proposed by Kramer et al in 1998.[1] It is formed along with vaccenic acid by biohydrogenation of dietary polyunsaturated fatty acids in the rumen.[2] It can be considered as the principal dietary form, accounting for as much as 85-90% of the total CLA content in dairy products.[3]

Biological properties

See main article: Conjugated linoleic acid

Laboratory studies indicate that rumenic acid shows anticarcinogenic properties.[4]


  1. Kramer J, Parodi P, Jensen R, Mossoba M, Yurawecz M, Adlof R (1998). "Rumenic acid: a proposed common name for the major conjugated linoleic acid isomer found in natural products". Lipids. 33 (8): 835. PMID 9727617.
  2. F. Destaillats, E. Buyukpamukcu, P.-A. Golay, F. Dionisi and F. Giuffrida (2005). "Letter to the Editor: Vaccenic and Rumenic Acids, A Distinct Feature of Ruminant Fats". J. Dairy Sci. 88 (449). |access-date= requires |url= (help)
  3. Cyberlipid. "Polyenoic Fatty Acids". Retrieved 2007-01-17.
  4. Lock AL, Corl BA, Barbano DM, Bauman DE, Ip C. (2004). "The anticarcinogenic effect of trans-11 18:1 is dependent on its conversion to cis-9, trans-11 CLA by delta9-desaturase in rats". J Nutr. 134(10): 2698–704. Retrieved 2007-01-15. Unknown parameter |month= ignored (help)