Figure 4 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 4 Chromatogram obtained using Shimadzu Nexera XR UPLC system and mobile phase 20% acetonitrile, 80% of 0.16% ammonium acetate and 0.2% of 1.5 M tetramethylammonium hydroxide (V/V), column Discovery C18 (4.6 mm i.d. × 150 mm, 5 μm) at 2 wavelengths 225 nm and 237 nm (first figure), with 3-D UV contour diagram extracted analytes UV spectra and peak purity (second figure).