Clotrimazole-d5 is intended for use as an internal standard for the quantification of clotrimazole by GC- or LC-MS. Clotrimazole is an imidazole antifungal agent.1 It is active against a variety of fungi, including C. albicans, A. fumigatus, S. cerevisiae, C. neoformans, T. mentagrophytes, and M. canis (MICs = <0.05-3.13 µg/ml).2 It inhibits the voltage-gated potassium channel Kv1.3 and the intermediate conductance calcium-activated potassium channel (IKCa1/KCa3.1; IC50s = 6 and 0.07 µM, respectively) and decreases proliferation of HaCaT keratinocytes (EC50 = 15 µM).3 Topical application of clotrimazole (1%) reduces oxazolone-induced ear swelling in an oxazolone-sensitized mouse model of delayed-type hypersensitivity. Clotrimazole (10 µM) also inhibits proliferation of A549 lung, HT-29 colon, and MM-RU melanoma cancer cells.4 Formulations containing clotrimazole have been used in the treatment of fungal skin infections.
1.Burgess, M.A., and Bodey, G.P.Clotrimazole (Bay b 5097): In vitro and clinical pharmacological studiesAntimicrob. Agents Chemother.2(6)423-426(1972) 2.Shadomy, S.In vitro antifungal activity of clotrimazole (Bay b 5097)Infect. Immun.4(2)143-148(1971) 3.Pegoraro, S., Lang, M., Dreker, T., et al.Inhibitors of potassium channels Kv1.3 and IK-1 as immunosuppressantsBioorg. Med. Chem. Lett.19(8)2299-2304(2009) 4.Benzaquen, L.R., Brugnara, C., Byers, H.R., et al.Clotrimazole inhibits cell proliferation in vitro and in vivoNat. Med.1(6)534-540(1995)