title: The validation of column-switching LC/MS as a high-throughput approach for direct analysis of di(2-ethylhexyl) phthalate released from PVC medical devices in intravenous solution.
abstract: Health Canada reported recently that medical devices containing di(2-ethylhexyl) phthalate (DEHP) should not be used in the clinical treatment of infants, young boys, pregnant women, and nursing mothers. The risk assessment of DEHP released from PVC medical devices is an important issue for hospitalized patients. In this study, a simple, accurate, low-contamination and high-throughput analytical technique for the determination of DEHP in intravenous (IV) solution was developed using column-switching liquid chromatography/mass spectrometry (LC/MS) with an extraction mini-column. The sample preparation for on-line extraction involved simply mixing IV solution with internal standard as DEHP-d(4) in LC glass vials. The IV fat emulsion drug sample cannot be analyzed directly, hence this sample spiked with DEHP-d(4) solution was extracted by hexane and measured by column-switching LC/MS yielding an average recovery of 92.2% (C.V.=7.8%, n=5). A linear response was found for a variety of drugs tested within the validated range of 0.1 or 0.5-10 microg/ml with correlation coefficients (r) greater than 0.99. These results suggest that this method can assay background exposure to DEHP released from PVC medical devices in the patients. The method was applied to various IV solution samples to establish the first screening method for DEHP released from medical devices with respect to their safety.
authors.affiliation: Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Hoshi University, Ebara 2-4-41, Shinagawa-ku, Tokyo 142-8501, Japan.
authors.forename: Koichi
authors.initials: K
authors.lastname: Inoue
authors.forename: Tae
authors.initials: T
authors.lastname: Higuchi
authors.forename: Fumio
authors.initials: F
authors.lastname: Okada
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Iguchi
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Yoshimura
authors.forename: Atsushige
authors.initials: A
authors.lastname: Sato
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nakazawa
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004051:Diethylhexyl Phthalate / Q000032:analysis* / Q000493:pharmacokinetics*; D004864:Equipment and Supplies / Q000592:standards; D007262:Infusions, Intravenous; D019999:Pharmaceutical Solutions / Q000032:analysis / Q000493:pharmacokinetics; D011143:Polyvinyl Chloride / Q000032:analysis* / Q000493:pharmacokinetics*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods
chemical_list: D019999:Pharmaceutical Solutions; D011143:Polyvinyl Chloride; D004051:Diethylhexyl Phthalate