title: Analysis of polycyclic aromatic hydrocarbons in metered dose inhaler drug formulations by isotope dilution gas chromatography/mass spectrometry.
abstract: Organic compounds extracted into metered dose inhalers (MDIs) from the rubber components of the metering valve are of increasing interest in the development of these formulations. Polycyclic aromatic hydrocarbons (PAHs) are a class of extractable organic compounds whose source is the carbon black commonly used as a reinforcing agent in rubber. The analytical method for PAHs described in this report employs "cold filtration" to remove the suspended drug substance and excipients, and gas chromatography/mass spectrometry (GC/MS) for separation and detection of individual PAHs. After filtration, stable isotope labelled analogues of target PAHs are spiked into the drug product to act as internal standards, correcting for recovery (termed "isotope dilution GC/MS"). Validation of the method was accomplished with respect to linearity, precision, limit of detection/quantitation, selectivity and ruggedness. Application to a variety of MDI drug product formulations revealed that certain PAHs are present at the ng/inhaler level.
authors.affiliation: Analytical Sciences Department, Glaxo Research Institute, Research Triangle Park, North Carolina 27709, USA.
authors.forename: D L
authors.initials: DL
authors.lastname: Norwood
authors.forename: D
authors.initials: D
authors.lastname: Prime
authors.forename: B P
authors.initials: BP
authors.lastname: Downey
authors.forename: J
authors.initials: J
authors.lastname: Creasey
authors.forename: S K
authors.initials: SK
authors.lastname: Sethi
authors.forename: P
authors.initials: P
authors.lastname: Haywood
mesh_terms: D008401:Gas Chromatography-Mass Spectrometry; D007202:Indicators and Reagents; D009330:Nebulizers and Vaporizers; D011083:Polycyclic Compounds / Q000032:analysis*; D011865:Radioisotope Dilution Technique; D012015:Reference Standards; D012996:Solutions
chemical_list: D007202:Indicators and Reagents; D011083:Polycyclic Compounds; D012996:Solutions