Author : A. Hussein, Ahmed
Determination of Atenolol in Human Plasma by New HPLC Method with Fluorescence Detection for Pharmacokinetics Studies
karbala journal of pharmaceutical sciences,
Volume 5, Issue 7, Pages 238-261
Purpose: A new, sensitive, specific and precise HPLC analysis method was developed for the determination of atenolol in human plasma in order to be utilized for pharmacokinetics study. Methods: The drug was extracted from plasma by liquid-liquid extraction technique using dichloromethane: 2-propanol (75:25). Bamethan sulfate was used as internal standard (IS). Samples were analyzed on ODS-3 C18 Intertsil column (150 x 4.6 mm, 5 µm), applying triethylamine (0.5%): methanol at a ratio of 90:10v/v with a final pH of 3.5 in isocratic mode as a mobile phase at a flow rate of 1.3 ml/min to attain adequate resolution. Using a Spectra autosampler, separations were performed at room temperature and monitored at an excitation wavelength of 228 nm and an emission wavelength of 298 nm after injection a 60μl sample into the HPLC system.
Results: A peak area was obtained for atenolol and bamethan with 6.4 and 10.4min retention time, respectively. The lower limit of quantitation (LLOQ) was identifiable and reproducible at 10ng/ml with a precision of 1.754%. The intra-day and inter-day precision at 30, 400 and 700 ng /ml level was found to be 1.909%, 1.571% , 1.358% and 3.229, 1.471, 3.246 respectively, always lower than the accepted criteria limits (15%). The relative recovery% of atenolol at 30, 400, and 700ng/ml was found to be 100.733, 99.948, and 98.599 respectively. Conclusions: The analysis method was found to be sensitive, accurate, and precise for the quantification of atenolol in human plasma. It was applied successfully, for pharmacokinetics studies