OBJECTIVE:To establish a New Vierordt method for assaying ingredients in compound fleroxacin suppositories and compound fleroxacin ear drops METHODS:New Vierordt method was applied to determination of fleroxacin and tinidazole in compound fleroxacin suppositories and fleroxacin and metronidazole in compound fleroxacin ear drops with no need of separation RESULTS:The fleroxacin and tinidazole in compound fleroxacin suppositories were detected at wavelength 286nm and 317nm respectively The average recoveries were 100 17% and 99 96% with RSDs=0 44% and 0 37% respectively The fleroxacin and metronidazole in the compound fleroxacin ear drops were detected at wavelength 286nm and 318nm respectively The average recoueries were 100 65% and 99 92% with RSDs=0 65% and 0 21% respectively CONCLUSION:The New Vierordt method can be used for quality control of the two compound preparations because of its convenience,accuracy and good repeatability and can eliminate mutual interference of two ingredients in preparations

OBJECTIVE:A HPLC method was established for determination of the level of sodium ferulate in plasma.ME_THODS:A C18 radial compression column was used with a mobile phase of CH3OH∶H2O∶H3PO4(250∶250∶0.2).The detecing wavelength was 254nm.RESULTS:The linear range was 1.2～24?g/ml(r=0.9 993).The average recovery was(98.8?0.6)%.The RSDs of within-day and between-day were less than 10%.CONCLUSION:This method provides an accurate and sensitive way in detecting plasma concentration of sodium ferulate.