Determination of ginkgolic acids in Ginkgo biloba extract and its preparations by high performance liquid chromatography / 药学学报

ABSTRACT

<p><b>AIM</b>To establish a high performance liquid chromatographic method for determination of ginkgolic acids in Ginkgo biloba extract and its preparations.</p><p><b>METHODS</b>Ginkgo biloba extract and its preparations were extracted with petroleum ether in Soxhlet apparatus, and then concentrated under vacuum. The ginkgolic acids were determined directly by HPLC, and identified by LC/DAD/ESI/MS. The chromatographic column was Inertsil ODS-2; the mobile phase was methanol-3% aqueous acetic acid(928); the flow rate was 1.0 mL.min-1; the column temperature was 40 degrees C; the detection wavelength was 310 nm.</p><p><b>RESULTS</b>There were six kinds of ginkgolic acid (C130, C151, C172, C150, C171 and an unknown compound C173 tentatively) in the Ginkgo biloba extract. The relative percentage content of ginkgolic acids C130, C151 and C171 was above 94%. The content of ginkgolic acids in Ginkgo biloba extract containing high content ginkgolic acids was 1.12%, and RSD was 2.4% (n = 5). The content of ginkgolic acids in one kind of EGb preparations (tablet) was 49.2 micrograms.g-1, and RSD was 4.3% (n = 5). The average recovery was 98.2%, RSD was 2.6% (n = 5).</p><p><b>CONCLUSION</b>The method is accurate, fast, simple, and can be used for determination of ginkgolic acids in Ginkgo biloba extract and its preparations.</p>