RESUMEN
Objective:To establish an HPLC-RID method for the simultaneous determination of taurine and aminocaproic acid in compound taurine eye drops. Methods:A Waters NH2column(250 mm ×4.6 mm,5 μm) was used, the mobile phase was water-acetonitrile (40:60) at a flow rate of 0.8 ml·min-1, the column temperature was 35.0℃, and the temperatures of the detector reference cell and the sample cell were both set at 35.0℃,The injection volume was 20 μl. Results:The linear ranges of taurine and aminocaproic acid were 0.05-2.00 mg·ml-1(r = 0.999 9). The average recovery was 98.57% (RSD = 1.07%,n= 9) and 100.69% (RSD =0.75%,n =9),respectively. Conclusion:The established method is accurate,simple and rapid, and suitable for the quality control of compound taurine eye drops.
RESUMEN
Objective: To establish an HPLC method for the determination of three bacteriostatic agents ( methylparaben, eth-ylparaben, propylparaben) in taurine eye drops. Methods:The HPLC method was conducted on a Phenomenex Gemini C18 column ( 250 mm × 4. 6 mm, 5 μm ). The mobile phase was 1％ acetic acid-methanol(40 :60). The flow rate was 1. 0 ml·min-1 and the de-tection wavelength was 254 nm with the injection volume of 20 μl and the column temperature of 25℃. Results:Methylparaben, eth-ylparaben and propylparaben showed good linear relationship (r>0. 999)within the range of 1. 00-19. 94μg·ml-1,2. 01-20. 08μg· ml-1 and 0. 21-10. 46 μg·ml-1,respectively. The average recoveries were 99. 20％-99. 90％, and the RSDs were 1. 34％-1. 54％(n=9). Conclusion:The method is accurate, reproducible and stable without interference, which can be used for the determination of three bacteriostatic agents in taurine eye drops.