title: Determination of seven flavonoids in Ixeridium gracile (DC.) Shih by high-performance liquid chromatography.
abstract: A high-performance liquid chromatographic technique coupled with photodiode array detection was proposed for the simultaneous determination of 7 flavonoids, i.e., quercetin, kaempferol, 7-hydroxyflavanone, 7-methoxyflavanone, 2',4'-dihydroxychalcone, 2',4'-dihydroxydihydrochalcone, and 7,2'-dihydroxy-3', 4'-dimethoxyisoflavane, in extracts of the plant Ixeridium gracile. Optimum separation was obtained by using a reversed-phase C18 method. Because of the different UV characteristics of these components, 5 detection wavelengths were used for the quantitative analysis. All of the flavonoids showed good linearity (r > 0.9999). The limit of detection and limit of quantitation values for the analytes ranged from 0.06 to 0.46 microg/mL and from 0.18 to 1.48 microg/mL, respectively. The method was validated by evaluating repeatability, precision, stability, and accuracy. Five different extraction and purification procedures were investigated for preparation of the sample solution. The optimized method was applied to the determination of flavonoids in I. gracile and was found to be efficient.
authors.affiliation: Chinese Academy of Sciences, Lanzhou Institute of Chemical Physics, Key Laboratory for Natural Medicine of Gansu Province, Lanzhou 730000, People's Republic of China.
authors.forename: Juan
authors.initials: J
authors.lastname: Chen
authors.forename: Xue-Mei
authors.initials: XM
authors.lastname: Ma
authors.forename: Yan-Ping
authors.initials: YP
authors.lastname: Shi
mesh_terms: D019659:Asteraceae / Q000737:chemistry*; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005419:Flavonoids / Q000032:analysis*
chemical_list: D005419:Flavonoids