Posaconazole-d5 is intended for use as an internal standard for the quantification of posaconazole by GC- or LC-MS. Posaconazole is a broad-spectrum triazole antifungal agent active against various yeasts and molds, including Aspergillus, Candida, Fusarium, and Zygomycetes.1 Posaconazole inhibits the growth of fungi by inhibiting the lanosterol 14α-demethylase enzyme (IC50s = 7-200 nM), which results in a disruption in the synthesis of ergosterol , a key sterol necessary for fungal cell membrane integrity and for the function of certain membrane-bound proteins.2
1.Herbrecht, R., Nivoix, Y., Fohrer, C., et al.Management of systemic fungal infections: Alternatives to itraconazoleJ. Antimicrob. Chemother.56(Suppl 1)i39-i48(2005) 2.Munayyer, H.K., Mann, P.A., Chau, A.S., et al.Posaconazole is a potent inhibitor of sterol 14α-demethylation in yeasts and moldsAntimicrob. Agents Chemother.48(10)3690-3696(2004)