Journal
BIOMEDICAL CHROMATOGRAPHY
Volume 35, Issue 8, Pages -Publisher
WILEY
DOI: 10.1002/bmc.5128
Keywords
antibody‐ conjugated magnetic immunoassay; cyclosporine; therapeutic drug monitoring; ultra‐ performance liquid chromatography– tandem mass spectrometry
Categories
Funding
- Oita University
- Food and Drug Administration
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A sensitive, wide-range, and high-throughput quantification method for CyA in whole blood using UPLC-MS/MS was developed in this study. The method showed strong correlation with ACMIA measurements, with consistently lower CyA concentrations measured by UPLC-MS/MS compared to ACMIA.
Because either trough or peak concentration at 2 h after administration is measured in routine therapeutic drug monitoring for cyclosporine A (CyA), a quantification method with a wide-range calibration curve capable of simultaneously measuring both concentrations is required. We developed a sensitive, wide-range and high-throughput quantification method for CyA in whole blood using ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS), and compared patients' blood CyA levels measured by UPLC-MS/MS and antibody-conjugated magnetic immunoassay (ACMIA). Whole blood samples were prepared by solid-phase extraction using Oasis HLB mu Elution plate. The UPLC-MS/MS assay showed excellent linearity over a wide calibration range of 5-2500 ng/mL. Within-batch accuracy and precision as well as batch-to-batch accuracy and precision fulfilled the criteria of US Food and Drug Administration guidelines. The blood CyA concentrations measured by the UPLC-MS/MS assay correlated strongly with those measured by ACMIA. A Bland-Altman plot showed a fixed error between CyA concentrations measured by the two methods, and the concentrations measured by the UPLC-MS/MS method were consistently lower than those measured by ACMIA. We have succeeded to develop a sensitive, wide-range and high-throughput quantification method for CyA in whole blood using UPLC-MS/MS.
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