Procainamide and N-Acetylprocainamide , Serum

Equipment : Roche Cobas Pro c503

Method : Procainamide : The assay is based on a homogeneous enzyme immunoassay technique used for the quantitative analysis of procainamide in human serum or plasma. The assay is based on competition between drug in the sample and drug labeled with the enzyme glucose‑6‑phosphate dehydrogenase
(G6PDH) for antibody binding sites. Enzyme activity decreases upon binding to the antibody, so the drug concentration in the sample can be measured in terms of enzyme activity. Active enzyme converts oxidized nicotinamide adenine dinucleotide (NAD) to NADH, resulting in an absorbance change that is measured spectrophotometrically. Endogenous serum G6PDH does not interfere because the coenzyme functions only with the bacterial (Leuconostoc mesenteroides) enzyme employed in the assay.

Method : NAPA : The assay is based on a homogeneous enzyme immunoassay technique used for the quantitative analysis of N‑acetylprocainamide in human serum or plasma. The assay is based on competition between drug in the sample and drug labeled with the enzyme glucose‑6‑phosphate dehydrogenase (G6PDH) for antibody binding sites. Enzyme activity decreases upon binding to the antibody, so the drug concentration in the sample can be measured in terms of enzyme activity. Active enzyme converts oxidized nicotinamide adenine dinucleotide (NAD) to NADH, resulting in an absorbance change that is measured spectrophotometrically. Endogenous serum G6PDH does not interfere because the coenzyme functions only with the bacterial (Leuconostoc mesenteroides) enzyme employed in the assay.