High-performance liquid chromatographic method development and validation for the simultaneous quantitation of naproxen sodium and pseudoephedrine hydrochloride impurities.
A reversed-phase high-performance liquid chromatographic procedure for the simultaneous determination of impurities associated with pseudoephedrine hydrochloride (PSEH) and naproxen sodium (NapNa) is developed and validated. The method is developed using a Waters Spherisorb cyano column (5 microm, 250 x 4.6 mm). An isocratic elution in a water-acetonitrile-methanol-triethylamine mixture (850:75:75:5) is adjusted to a pH of 3.7 +/- 0.02 with formic acid as the mobile phase. The UV detection was set at 260 nm, and the wavelength was switched to 235 nm before the elution of the last component, 2-ethyl-6-methoxy-naphthalene (EMN). The method is shown to be linear at a concentration range of 0.24 to 1.92 microg/mL for benzaldehyde, benzoic acid, and 2-(methylamino)-propiophenone hydrochloride, which are known impurities of PSEH. The NapNa impurities, 2-(6'-hydroxy-2'-naphthyl) propionic acid, 2-hydroxy-6-methoxy-naphthalene, 1-(6'-methoxy-2'-naphthyl) ethanol, 2-acetyl-6-methoxy-naphthalene, and EMN are also demonstrated to be linear at a concentration range of 0.44 to 3.52 microg/mL. Under the chromatographic conditions of the method, all impurities are resolved from the active components.
Consumer Care Division, Bayer Corporation, Morristown, NJ 07962, USA. Anthony.Ekpe.B@Bayer.com
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Ekpe
J H
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Tong
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Rodriguez
D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000737:chemistry*; D001993:Bronchodilator Agents / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004340:Drug Contamination; D004809:Ephedrine / Q000737:chemistry*; D017408:Guidelines as Topic; D009288:Naproxen / Q000737:chemistry*; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet
D000894:Anti-Inflammatory Agents, Non-Steroidal; D001993:Bronchodilator Agents; D009288:Naproxen; D004809:Ephedrine