title: Determination of the heat shock protein 90 inhibitor 17-dimethylaminoethylamino-17-demethoxygeldanamycin in plasma by liquid chromatography-electrospray mass spectrometry.
abstract: A rapid method was developed for the quantitative determination of the novel heat shock protein 90 inhibitor, 17-dimethylaminoethylamino-17-demethoxygeldanamycin (17-DMAG; NSC707545), in human plasma. Calibration curves were constructed, and were analyzed using a weight factor proportional to the nominal concentration. Sample pretreatment involved a one-step extraction with ethyl acetate of 0.5-ml samples. The analysis was performed in the range of 1-100 ng/ml on a column (75 mm x 2.1 mm internal diameter with 3.5 microm C18 particle size), using 55% methanol in water containing formic acid as the mobile phase. The column effluent was monitored by mass spectrometry with positive electrospray ionization. The values for precision and accuracy were always <8% and <10% relative error, respectively. The method was successfully applied to examine the pharmacokinetics of 17-DMAG in a cancer patient.
authors.affiliation: Clinical Pharmacology Research Core, Medical Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA.
authors.forename: Kyunghwa
authors.initials: K
authors.lastname: Hwang
authors.forename: Charity D
authors.initials: CD
authors.lastname: Scripture
authors.forename: Martin
authors.initials: M
authors.lastname: Gutierrez
authors.forename: Shivaani
authors.initials: S
authors.lastname: Kummar
authors.forename: William D
authors.initials: WD
authors.lastname: Figg
authors.forename: Alex
authors.initials: A
authors.lastname: Sparreboom
mesh_terms: D016227:Benzoquinones; D002853:Chromatography, Liquid / Q000379:methods*; D018841:HSP90 Heat-Shock Proteins / Q000037:antagonists & inhibitors*; D047029:Lactams, Macrocyclic; D011809:Quinones / Q000097:blood* / Q000494:pharmacology; D012015:Reference Standards; D015203:Reproducibility of Results; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D016227:Benzoquinones; D018841:HSP90 Heat-Shock Proteins; D047029:Lactams, Macrocyclic; D011809:Quinones; C448659:17-(dimethylaminoethylamino)-17-demethoxygeldanamycin