Figure 3 from: Logoyda L (2021) Novel HPLC-UV method for simultaneous determination of valsartan and atenolol in fixed dosage form; Study of green profile assessment. Pharmacia 68(1): 43-51. https://doi.org/10.3897/pharmacia.68.e53631

Figure 3 Elution profiles obtained for test samples prepared of Valsartan + Atenolol tablets (80 + 100) mg using mobile phases: a) 20% acetonitrile and 80% of 0.16% ammonium acetate (V/V); b) 20% acetonitrile, 80% of 0.16% ammonium acetate and 0.2 % of 1.5 M tetramethylammonium hydroxide (V/V). Chromatographic conditions: Shimadzu Nexera XR UPLC system, C18 chromatographic column Discovery C18 (4.6 mm i.d. × 150 mm, 5 μm), flow rate 1.0 mL/min, column temperature 30 °C.