Fig. 4From: Spectrophotometric resolution for quantitative analysis of aspirin and rivaroxaban combination therapy in biological fluids using simple and eco-friendly procedureA Ratio spectra of ASP 4–40 μg/mL using 20 μg/mL ROX as a divisor in methanol. B Ratio spectra of ROX 2–20 μg/mL using 36 μg/mL ASP as a divisor in methanolBack to article page