Arachidic acid-d2 is intended for use as an internal standard for the quantification of arachidic acid by GC- or LC-MS. Arachidic acid is a long-chain saturated fatty acid that has been found in peanut butter and anaerobic fungi.1,2 It inhibits rabbit neutrophil aggregation induced by N-formyl-methionyl-leucyl-phenylalanine when used at a concentration of 5 μM.3 Formulations containing arachidic acid have been used as surfactants in the manufacture of soaps and cosmetics.

References
1. Negoita, M., Mihai, A.L., Adascalului, A., et al. Comparison of the fatty acid composition of peanut butter by applying different fat extraction procedures. Rev. Chim. (Bucharest) 69(11), 3023-3032 (2018).
2. KoppovÁ, I., NovotnÁ, Z., •trosovÁ, L., et al. Analysis of fatty acid composition of anaerobic rumen fungi. Folia Microbiol. (Praha) 53(3), 217-220 (2008).
3. Naccache, P.H., Moiski, T.F., Volpi, M., et al. Modulation of rabbit neutrophil aggregation and degranulation by free fatty acids. J. Leukoc. Biol. 36(3), 333-340 (1984).