Indicator papers based on immobilized copper (II) sulfate have been obtained for the determination of the β-lactam antibiotic ceftriaxone. The interaction of immobilized copper (II) sulfate with ceftriaxone has been assessed using diff use refl ectance spectroscopy. Methods have been developed for visual colorimetric and colorimetric determination of the antibiotic using a smartphone camera, Adobe Photoshop CS5® software, and a regression model built using the Python programming language. Color test scales for rapid assessment of ceftriaxone content have been obtained.
