Development of Radioimmunoassay for Measurement of Serum Digoxin in Digitalized Patients Using Novel Anti-digoxin Antiserum

• Published in: Biological & pharmaceutical bulletin Vol. 25; no. 4; pp. 422 - 425
• Main Authors: Ikeda, Yukari, Araki, Tsutomu, Takimoto, Hiroaki, Fujii, Youichi
• Format: Journal Article
• Language: English
• Published: Tokyo The Pharmaceutical Society of Japan 01-04-2002; Maruzen; Japan Science and Technology Agency
• Subjects: Analysis; Animals; anti-digoxin antiserum; Biological and medical sciences; Cardiotonic agents; Cardiovascular system; Cattle; digoxin; Digoxin - analogs & derivatives; Digoxin - analysis; Digoxin - blood; digoxin 3′-hemisuccinate–bovine serum albumin (BSA) conjugate; General pharmacology; Humans; Immune Sera - analysis; Immune Sera - blood; Medical sciences; Pharmacology. Drug treatments; Radioimmunoassay - methods; Radioimmunoassay - statistics & numerical data; RIA; Serum Albumin, Bovine - analysis; Human; Biological fluid; Cardiotonic agent; Digoxin; Free form; Monoclonal antibody; Blood; Bound form; Absorption; Antiserum; Analysis method; Reproducibility; Radioimmunoassay; Distribution; Separation process; Serum; Glycoside; Pharmacokinetics; Digitalis drug; Quantitative analysis
• ISSN: 0918-6158; 1347-5215
• DOI: 10.1248/bpb.25.422

There is an antiserum elicited by digoxin 3′-hemisuccinate–bovine serum albumin (BSA) conjugate possessing high specificity for digoxin. Our study focused on development of RIA using this novel antiserum for measurement of digoxin in serum from digitalized patients. The property of the new antiserum was investigated by RIA with digoxin 3′-hemisuccinyl-[3H]leucine. The separation of bound and free fractions was performed using a dextran-coated charcoal suspension. The new antiserum bound approximately 50% of digoxin 3′-hemisuccinyl-[3H]leucine with a final dilution of 1 : 30000. The intra- and inter-assay coefficients of variation were <9% in the range of 0.52—4.17 ng/ml. The mean digoxin concentration in serum samples (n=35) from digitalized patients was estimated to be 0.68 ng/ml, which was lower than its measurement of digoxin with the commercial anti-digoxin BSA serum and monoclonal anti-digoxin. It is apparent that the RIA described here has sufficient precision. The RIA system was available for the measurement of digoxin in serum from digitalized patients.