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• W2781854983 abstract "Monitoring tacrolimus (Tac) exposure in cell matrices enriched with lymphocytes can improve Tac therapeutic drug monitoring (TDM) in solid organ transplant recipients. An UPLC–MS/MS based assay for Tac quantification in peripheral blood T CD4+ and B CD19+ lymphocytes was developed. Peripheral blood mononuclear cells (PBMC) were obtained by density gradient centrifugation and highly purified (purity >90%) T CD4+ and B CD19+ cell suspensions were acquired by magnetic negative selection from whole blood of 6 healthy volunteers. The purity of lymphocyte suspensions was checked by flow cytometry. Tac extraction was performed in a liquid–liquid zinc sulfate, methanol and acetonitrile based medium. Ascomycin was used as internal standard. The equipment used was a Waters® Acquity™ UPLC system (Waters Corporation, Milford, MA, USA). The chromatographic run was performed on a Waters® MassTrak TDM C18 (2.1 × 10 mm) column (Waters Corporation, Milford, MA, USA). at a flow rate of 0.4 mL/min. The instrument was set in electrospray positive ionization mode. The method was validated according to Clinical Laboratory Standard Institute (CLSI) guidelines and showed a high sensitivity and specificity over a range of 0–5.2 ng/mL in PBMC, 0–5.0 ng/mL in T CD4+ Lymphocytes and 0–5.3 ng/mL in B CD19+ lymphocytes. Precision was appropriate with CV of intra-assay quantifications ranging from 4.9 to 7.4%, and of inter-assay quantifications from 7.2 to 13.9%. Limit of detection and quantification were 0.100 and 0.115 ng/mL in PBMC, 0.058 and 0.109 ng/mL in T CD4+ and 0.017 and 0.150 ng/mL in B CD19+ cells. Matrix effect was not significant among all the studied matrices. Samples showed stability for Tac quantification over a period of 90 days either at room temperature or at −30 °C storage conditions. The method was applied to clinical samples of 20 kidney transplant recipients. Concentrations ranged from 2.200 to 11.900 ng/mL in whole blood, from 0.005 to 0.570 ng/106 cells in PBMC, from 0.081 to 1.432 ng/106 cells in T CD4+, and from 0.197 to 1.564 ng/106 cells in B CD19+ cell matrices. The method has potential applicability for Tac TDM in solid organ transplant recipients." @default.
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• W2781854983 date "2018-04-01" @default.
• W2781854983 modified "2023-10-12" @default.
• W2781854983 title "UPLC–MS/MS assay validation for tacrolimus quantitative determination in peripheral blood T CD4+ and B CD19+ lymphocytes" @default.
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• W2781854983 doi "https://doi.org/10.1016/j.jpba.2018.01.002" @default.
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