title: Quantification of Kryptofix 2.2.2 in 2-[(18)F]FDG and other radiopharmaceuticals by LC/MS/MS.
abstract: A high-performance liquid chromatography-tandem mass spectrometric method (LC/MS/MS) was developed and validated for the quantitative analysis of Kryptofix (K-222) in the radiopharmaceuticals of 2-deoxy-2-[(18)F] fluoro-D-glucose (2-[(18)F]FDG) and 3-(3-((3-fluoropropyl)thio)-1,2,5-thiadiazol-4-yl)-1,2,5,6-tetrahydro-1-methylpyridine (FPTZTP). With an internal standard, the limit of quantitation for K-222 was 1.0 ng/ml. This is so far the most sensitive method for the quantification of K-222. Excellent linearity (RSQ = 0.9997) was obtained over the range of 1.0-100 ng/ml. Good precision and accuracy were also observed. The method is amenable to the validation of radiosynthetic methods.
authors.affiliation: PET Department, Warren G. Magnuson Clinical Center, National Institutes of Health, Building 10, Room 1C 401, Bethesda, MD 20892, USA.
authors.forename: Ying
authors.initials: Y
authors.lastname: Ma
authors.forename: Bill X
authors.initials: BX
authors.lastname: Huang
authors.forename: Michael A
authors.initials: MA
authors.lastname: Channing
authors.forename: William C
authors.initials: WC
authors.lastname: Eckelman
mesh_terms: D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000032:analysis*; D002614:Chelating Agents / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D019788:Fluorodeoxyglucose F18 / Q000032:analysis*; D019275:Radiopharmaceuticals / Q000032:analysis*; D015203:Reproducibility of Results; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D019086:Bridged Bicyclo Compounds, Heterocyclic; D002614:Chelating Agents; D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18; C006071:cryptating agent 222