Simple Method for Simultaneous Quantitation and Fingerprint Analysis of Ginkgo biloba Tablets by High Performance Liquid Chromatography-UV-Evaporative Light Scattering Detector

摘要

By optimizing the separation and analytical conditions,a reliable,simple and accurate high-performance liquid chromatography(HPLC) method coupled with ultraviolet(UV) and evaporative light scattering detector(ELSD) was developed for the simultaneous determination of lactones and flavonoid,that is,bilobalide,ginkgolide A,ginkgolide B,and rutin,in more than 10 batches of Ginkgo biloba tablets from different pharmaceutical companies.The method could also be applied to fingerprint research,for a more general evaluation of the quality of this prepara-tion.The separation of the components was achieved on a Hanbon C18 column with gradient elution using water and methanol containing 0.1% trifluoroacetic acid(TFA).The column temperature was 30 °C and the flow-rate of the mobile phase was 0.6 mL/min.The drift tube temperature of the ELSD was set at 100 °C,and the nitrogen flow-rate was 2 L/min.Good linear relationships were shown with correlation coefficients for analytes exceeding 0.9913.The limits of detection(LODs,S/N=3) and the limits of quantitation(LOQs,S/N=10) were 0.00887―0.0508 μg/μL and 0.0171― 0.0636 μg/μL,respectively,on the column.The relative standard deviations(RSD) of the analytes were less than 3.61% for intraday and 3.70% for interday,respectively.The average recovery rates obtained were in the range of(97.3±4.3)% to(101.9±3.1)% for all the compounds.The results of quantitative and fingerprint analysis proved that the contents of the components were totally similar in the preparation of Ginkgo biloba tablets from the same pharmaceutical company;whereas,they varied significantly in the preparations of Ginkgo biloba tablets from differ-ent companies.