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Analysis of flavonoids in Ginkgo biloba L. and its phytopharmaceuticals by capillary electrophoresis with electrochemical detection

Cao, Yuhua, Chu, Qingcui, Fang, Yuzhi, Ye, Jiannong
Analytical and bioanalytical chemistry 2002 v.374 no.2 pp. 294-299
Ginkgo biloba, apigenin, borax, capillary electrophoresis, catechin, detection limit, electrochemistry, electrodes, epicatechin, luteolin, pH, phytopharmaceuticals, quercetin, rutin
A high-performance capillary electrophoretic (CE) method with electrochemical detection (ED) has been developed for determination of the pharmacologically active flavonoids in Ginkgo biloba L. and phytopharmaceuticals containing its extract. Epicatechin, catechin, rutin, apigenin, luteolin, and quercetin are important flavonoids in this plant. Operated in a wall-jet configuration, a 300 µm diameter carbon-disk electrode was used as working electrode with good response to the six analytes at +1000 mV (relative to the SCE). Under the optimum conditions, the analytes were separated within 22 min in a borax buffer (pH 9.0). Excellent linearity was obtained over two orders of magnitude and detection limits (S/N=3) ranged from 1.4×10–⁷to 5.0×10–⁷g mL–¹for all six analytes. The method was successfully used for assay of Ginkgo biloba L. and its phytopharmaceuticals after a relatively simple extraction procedure; the results obtained were satisfactory.