title: Measurement of resiniferatoxin in serum samples by high-performance liquid chromatography.
abstract: A novel and simple method of extraction, separation, identification and quantification of resiniferatoxin (RTX) in serum samples is reported. Human serum and whole blood were treated with acetonitrile to denature proteins, such as orosomucoid, and the soluble fraction was passed through a reversed-phase C18 cartridge. RTX eluted from the cartridge was quantified by high-performance liquid chromatography (HPLC) using a reversed-phase C18 column. Reproducible recovery of RTX and tinyatoxin, an internal standard, from serum was achieved. Isocratic elution with 62% acetonitrile provided a suitable retention time without interfering peaks eluting near the analyte. Therefore, the procedure described provides a useful assay for determination of serum RTX pharmacokinetic parameters.
authors.affiliation: DASS/NIH, Building 49, Room 1A08, 49 Convent Drive Bethesda, MD 20892, USA. amannes@nih.gov
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Mannes
authors.forename: Dorothy Cimino
authors.initials: DC
authors.lastname: Brown
authors.forename: Jason
authors.initials: J
authors.lastname: Keller
authors.forename: Lauren
authors.initials: L
authors.lastname: Cordes
authors.forename: Roderic G
authors.initials: RG
authors.lastname: Eckenhoff
authors.forename: Robert M
authors.initials: RM
authors.lastname: Caudle
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Iadarola
authors.forename: Qing C
authors.initials: QC
authors.lastname: Meng
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004224:Diterpenes / Q000097:blood* / Q000737:chemistry; D006801:Humans; D015394:Molecular Structure; D015203:Reproducibility of Results
chemical_list: D004224:Diterpenes; C024353:resiniferatoxin