ABSTRACT
OBJECTIVE: To establish an HPLC method with gradient elution for the determination of resorcinol and triamcinolone acetonide acetate in compound resorcinol cream. METHODS: The HPLC was conducted on a ZORBAX Eclipse XDB-C18 column (4.6 mm × 250 mm, 5 μm) with acetonitrile (A)-0.5% ammonium acetate solution (B) as the mobile phase. The gradient elution program was as follows: 0-3 min (25% A), 3-5 min (25% A-55% A), and 5-15 min (55% A). The column temperature was 40°C. The flow rate was 1.0 mL · min-1 and the detection wavelength was 240 nm. RESULTS: The linear ranges of resorcinol and triamcinolone acetonide acetate were 103.18-515.90 μmg · mL-1 (r=1.0000) and 1.336-6.680 μg · mL-1 (r=0.999 4), respectively. The average recoveries were 99.3% (RSD=0.62%) and 99.1% (RSD=0.73%), respectively. CONCLUSION: The proposed method is simple, rapid and accurate. It has been applied in the assay of samples with satisfactory results. Copyright 2012 by the Chinese Pharmaceutical Association.