Fosfluconazole

Kinase experiment:

An aliquot of 200 μL of mucosa scrap lysate solution is mixed with 100 mM phosphate buffer, pH 7.4, to a final volume at 1 ml. The concentration of the test compounds (Fosphenytoin and Fosfluconazole) is 10 μM. The incubation medium is prewarmed at 37°C before the reaction is initiated by addition of the tested compounds. An aliquot of 100 μL is collected from the incubation vial at the time points 0, 5, 10, 20, 30, 45, and 60 min and transferred to a 96-well plate, in which 100 μL of Acetonitrile is prefilled to terminate the reaction. The samples are diluted 5-fold with acetonitrile containing 1 μM Tolbutamide as an analytical internal standard. The samples are centrifuged at 4000 rpm for 5 min to precipitate protein. The supernatant is transferred to a new 96-well plate for concentration analysis by liquid chromatography/tandem mass spectrometry (LC/MS/MS)[2].

References:

[1]. Hagiya H, et al. Successful treatment of recurrent candidemia due to candidal thrombophlebitis associated with a central venous catheter using a combination of Fosfluconazole and micafungin. Intern Med. 2013;52(18):2139-43.
[2]. Yuan H, et al. Evaluation of in vitro models for screening alkaline phosphatase-mediated bioconversion of phosphate ester prodrugs. Drug Metab Dispos. 2009 Jul;37(7):1443-7.
[3]. Aoyama T, et al. Pharmacokinetics of fluconazole and Fosfluconazole after intraperitoneal administration to peritoneal dialysis rats. Drug Metab Pharmacokinet. 2005 Dec;20(6):485-90.