High performance liquid chromatography with a C18 reverse-phase column was used to separatethe five components in cough syrup, including acetaminophen, p-aminophenol, caffeine, chlorphenamine maleateand guaifenesin. The mobile phase consists of 15wi% acetonitrile, 0.004mol/L sodium heptyl sulfonate,0.03 mole/L potassium di- hydrogen phosphate and triethylamine ( volume ratio 13: 40: 44: 3), the pH of which isadjusted to 3.0 by phosphoric acid. The contents of the five components are analyzed on an ultraviolet spectropho-tometer at 254nm, with a flow rate of 0.4mL/min. The results show that the calibration curves are linear in acertain range. The average recovery of five components is between 96.31% and 102.3% .
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