title: The use of on-line and off-line chromatographic extraction techniques coupled with mass spectrometry for support of in vivo and in vitro assays in drug discovery.
abstract: We have investigated various sample chromatographic extraction and sample preparation methods for liquid chromatography mass spectrometry analysis in order to increase the throughput of various in vivo and in vitro assays in support of drug discovery. The results indicated that direct plasma injection, although certainly faster than conventional protein precipitation for sample preparation, had problems associated with column longevity and overall robustness. Frequently a single study could not be completed without column replacement. On-line solid phase extraction, on the other hand, compared well with off-line solid phase extraction, using our LC extraction column design, as contamination of the extraction column was minimized by back flushing using the Gilson syringe pump. Finally, on-line solid phase extraction for support of Caco-2 permeability studies worked very well for both single components and mixtures as the matrix was much simpler, presenting fewer contamination problems.
authors.affiliation: The R.W. Johnson Pharmaceutical Research Institute, Spring House, PA 19477, USA. jmasucci@prius.jnj.com
authors.forename: J J A
authors.initials: JJ
authors.lastname: Masucci
authors.forename: G G W
authors.initials: GG
authors.lastname: Caldwell
authors.forename: W W J
authors.initials: WW
authors.lastname: Jones
authors.forename: S S J
authors.initials: SS
authors.lastname: Juzwin
authors.forename: P P J
authors.initials: PP
authors.lastname: Sasso
authors.forename: M
authors.initials: M
authors.lastname: Evangelisto
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000032:analysis; D000897:Anti-Ulcer Agents / Q000032:analysis; D000959:Antihypertensive Agents / Q000032:analysis; D001241:Aspirin / Q000032:analysis; D018938:Caco-2 Cells; D002853:Chromatography, Liquid / Q000295:instrumentation / Q000379:methods*; D002927:Cimetidine / Q000032:analysis; D004353:Drug Evaluation, Preclinical / Q000295:instrumentation / Q000379:methods*; D008401:Gas Chromatography-Mass Spectrometry / Q000295:instrumentation / Q000379:methods*; D006634:Histamine H1 Antagonists / Q000032:analysis; D006801:Humans; D006852:Hydrochlorothiazide / Q000032:analysis; D004364:Pharmaceutical Preparations / Q000032:analysis*; D010726:Phosphodiesterase Inhibitors / Q000032:analysis; D011398:Promethazine / Q000032:analysis; D013806:Theophylline / Q000032:analysis
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D000897:Anti-Ulcer Agents; D000959:Antihypertensive Agents; D006634:Histamine H1 Antagonists; D004364:Pharmaceutical Preparations; D010726:Phosphodiesterase Inhibitors; D006852:Hydrochlorothiazide; D002927:Cimetidine; D013806:Theophylline; D011398:Promethazine; D001241:Aspirin