Clofibric acid-d₄is intended for use as an internal standard for the quantification of clofibric acid by GC- or LC-MS. Clofibric acid is a peroxisome proliferator-activated receptor α (PPARα) agonist (EC₅₀= 50 ?M in a transactivation assay) and the active metabolite of clofibrate .¹It is formed from clofibrate by tissue and serum esterases.²Dietary administration of clofibric acid (0.067-0.22%) reduces serum cholesterol, phospholipid, and triglyceride levels in rats.³It decreases glutamate oxaloacetate transaminase (GOT) levels and increases glutamate pyruvate transaminase (GPT) and lactate dehydrogenase (LDH) levels, markers of xenobiotic stress, in the plasma of carp (C. carpio) when administered in tank water at a concentration of 10 ?g/L.⁴Clofibric acid has been found in wastewater effluent.⁵

1.Giampietro, L., Laghezza, A., Cerchia, C., et al.Novel phenyldiazenyl fibrate analogues as PPAR α/γ/δ pan-agonists for the amelioration of metabolic syndromeACS Med. Chem. Lett.10(4)545-551(2019) 2.Cayen, M.N.Metabolic disposition of clofibrateDrug Metabol. Drug Interact.3(1 & 2)77-103(1980) 3.Cayen, M.N., Ferdinandi, E.S., Greselin, E., et al.Clofibrate and clofibric acid: Comparison of the metabolic disposition in rats and dogsJ. Pharmacol. Exp. Ther.200(1)33-43(1977) 4.Saravanan, M., Karthika, S., Malarvizhi, A., et al.Ecotoxicological impacts of clofibric acid and diclofenac in common carp (Cyprinus carpio) fingerlings: Hematological, biochemical, ionoregulatory and enzymological responsesJ. Hazard. Mater.195188-194(2011) 5.Tixier, C., Singer, H.P., Oellers, S., et al.Occurrence and fate of carbamazepine, clofibric acid, diclofenac, ibuprofen, ketoprofen, and naproxen in surface watersEnviron. Sci. Technol.37(6)1061-1068(2003)