Determination of two components and salicylic acid in aspirin and dipyridamole tablets by HPLC-DAD wavelength switching method
Objective:To establish an HPLC-DAD wavelength-switching method for the determination of aspirin dipyridamole tablets and free salicylic acid.Methods:An Agilent ZORBAX SB C18 column(250 mm ×4.6 mm,5 μm)was adopted with acetonitrile-tetrahydrofuran-glacial acetic acid-water(20∶5∶5∶70)as the mobile phase,and isocratic elution was performed at the flow rate of 1.0 mL·min-1,the column temperature of 30 ℃,and the detection wavelengths were 276 nm for aspirin,284 nm for dipyridamole and 303 nm for salicylic acid.Results:Aspirin,dipyridamole and free salicylic acid had a good linear relationship in the range of 38.37-383.71,9.60-96.05 and 1.02-10.21 µg·mL-1 respectively.The average recoveries were 99.88%(RSD=0.23%),99.01%(RSD=0.46%)and 100.99%(RSD=0.75%),respectively.There was no signif-icant difference for the content resuls between the established method and the standard method.The content uni-formity of A+2.2S ranges from 4.7 to 6.4.Conclusion:The established method is simple and suitable for the quality control of aspirin dipyridamole tablets.