Abstract
The aim was to develop a LC/MS/MS method able to quantify mycophenolic acid (MPA) in the peripheral blood mononuclear cells (PBMCs) of transplanted patients. PBMCs were isolated from blood by a density gradient separation. The chromatographic separation was carried out on a Zorbax Stable Bond CN, 150mm×2.1mm, and MS/MS detection was performed after positive electrospray ionisation of the protonated parent ion. The calibration range was from 0.25 to 100ng/sample. Extraction from the cells and ionisation recoveries reached 73.5 and 37.9%, respectively. Inaccuracy was always <10% with CVs <15%. MPA was stable at room temperature in the autosampler over 48h and at −20°C over 1.5 months. Application to clinical samples taken from patients treated with mycophenolate mofetil indicated that the method is suitable for measuring intracellular MPA.
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