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Chromatogram of synthetic standard mixture containing five food additives and caffeine recorded under optimized analysis conditions (1: sodium benzoate (15 μg/mL), 2: potassium sorbate (15 μg/mL), 3: caffeine (15 μg/mL), 4: ponceau 4R (6 μg/mL), 5: allura red (6 μg/mL), and 6: carmoisine (6 μg/mL)).
