title: Determination of hyperforin in human plasma using solid-phase extraction and high-performance liquid chromatography with ultraviolet detection.
abstract: Hyperforin is one of the most important active components in St. John's wort (Hypericum perforatum), a botanical dietary supplement used as an alternative treatment modality for mild to moderate depression. A solid-phase extraction (SPE) and an isocratic high-performance liquid chromatography (HPLC) analysis with ultraviolet (UV) detection were developed to determine hyperforin in human plasma samples. Benzo[k]fluoranthene was used as an internal standard. The absolute recovery for hyperforin was more than 89% for plasma concentrations ranging from 25 to 500 ng/ml. The linearity of calibration curves, inter-day and intra-day relative standard deviations were investigated. The limit of detection (LOD) of hyperforin was 4 ng/ml in plasma and the limit of quantitation (LOQ) was 10 ng/ml. Hyperforin concentrations in human plasma following St. John's wort administration were analyzed. The result suggests that this method is rapid, sensitive, reproducible and capable of quantitative analysis of hyperforin plasma concentrations.
authors.affiliation: Division of Chemistry, National Center for Toxicological Research, US Food and Drug Administration, HFT-230, 3900 NCTR Road, Jefferson, AR 72079, USA.
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Cui
authors.forename: Bill
authors.initials: B
authors.lastname: Gurley
authors.forename: Catharina Y W
authors.initials: CY
authors.lastname: Ang
authors.forename: Julian
authors.initials: J
authors.lastname: Leakey
mesh_terms: D001643:Bridged Bicyclo Compounds; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D010696:Phloroglucinol / Q000031:analogs & derivatives; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*; D013729:Terpenes / Q000097:blood*
chemical_list: D001643:Bridged Bicyclo Compounds; D013729:Terpenes; D010696:Phloroglucinol; C001654:hyperforin