High-performance liquid chromatographic determination of atenolol in tablets

Abstract A reversed phase high-performance liquid chromatographic method was developed for the determination of atenolol in four oral 100 mg atenolol preparations. An aliquot of the sample is dissolved in a mobile phase consisting of 0.0612 M potassium hydrogen phosphate - isopropanol-tetrahydrofuran (84:10:6) v/v). The pH was adjusted to 6.7 with phosphate buffer. Nicotinamide was used as internal standard and chromatographed on a Pinkerton column ISRP (GFF-S5–80) 5 μm, 150 × 4.6 mm i.d. The applied column is convenient for the assay at least 90 samples of atenolol without degrading column performance. The detection was performed at 272 nm. The retention time for atenolol was 5.07 min. The proposed HPLC method was found to be suitable for the rapid and precise routine analysis of atenolol in tablets.