Ibuprofen-d₃contains three deuterium atoms. It is intended for use as an internal standard for the quantification of ibuprofen by GC-or LC-mass spectrometry. Ibuprofen is a non-selective, reversible COX inhibitor. The IC₅₀values for human recombinant COX-1 and -2 are 2.6 and 1.53 µM, respectively.¹The K_ivalue for ovine COX-1 and -2 is 9 µM.²

1.Barnett, J., Chow, J., Ives, D., et al.Purification, characterization and selective inhibition of human prostaglandin G/H synthase 1 and 2 expressed in the baculovirus systemBiochim Biophys. Acta.1209(1)130-139(1994) 2.Johnson, J.L., Wimsatt, J., Buckel, S.D., et al.Purification and characterization of prostaglandin H synthase-2 from sheep placental cotyledonsArch. Biochem. Biophys.324(1)26-34(1995)