An enzyme-linked immunosorbent assay for therapeutic drug monitoring of infliximab

Therapeutic Drug Monitoring
David TernantGilles Paintaud

Abstract

An enzyme-linked immunosorbent assay (ELISA) measuring serum infliximab concentrations in treated patients was developed. Microtiter plates were sensitized with tumor necrosis factor alpha (TNF-alpha) and saturated with phosphate-buffered saline (PBS) containing 1% bovine serum albumin (BSA). Samples diluted 1:100 in PBS-1% BSA were added and bound infliximab was detected using peroxidase-conjugated goat anti-human immunoglobulin G specific for Fc fragment (HRP-anti hIgG). Reading was performed using an ELISA plate reader. The limit of detection, calculated by assaying 10 replicates of a drug-free serum sample or blank sample and defined as the lowest concentration distinguishable from zero at 2 standard deviations, was 0.014 microg/mL. Each quality control sample was tested on 7 occasions on 1 day and on 5 separate days. The intraday precision indices of the method were (percent coefficients of variation, CV%) 11.7%, 6.2%, and 6.9% for 0.04 microg/mL, 2 microg/mL, and 4.5 microg/mL, respectively. The corresponding bias measures (percent deviation) were -5.5%, -1.9%, and -7.9%, respectively. The between-days precision was 9.8%, 5.3%, and 5.3% for 0.04 microg/mL, 2 microg/mL, and 4.5 microg/mL, respectively. The corresponding bi...Continue Reading

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