Determination of Drug Loading Rate of Butyl-5-Aminosalicylic Acid-Pectin Conjugates by HPLC / 中国药房

ABSTRACT

OBJECTIVE:To establish an HPLC method for the determination of the drug loading rate of butyl-5-aminosalicylic acid-pectin conjugate.METHODS:The conjugate was hydrolyzed with base solution and neutralized with acid before being determined by HPLC.Kromasil C18 column was used as chromatographic column with mobile phase consisted of water(containing 0.15% triethylamine and 0.15% acetic acid)-methanol(95∶5,V/V).The detection wavelength was set at 240 nm.RESULTS:The calibration curve of 5-aminosalicylic acid was linear over the range of 1～100 ?g?mL-1(r=0.999 9) at an average recovery of 99.90%.Both intra-day and inter-day RSD were less than 2.25%.The drug loading rate of the conjugate was 12.76 %(n=3).CONCLUSION:The method is simple,rapid,accurate,and suitable for the determination of drug-loading rate of conjugate.