title: Determination of cysteinyl leukotrienes in exhaled breath condensate: method combining immunoseparation with LC-ESI-MS/MS.
abstract: A rapid and precise method for the identification and quantification of cysteinyl leukotrienes (leukotriene C(4), leukotriene D(4) and leukotriene E(4)), essential markers of bronchial asthma, in exhaled breath condensate was developed. The protocol consists of immunoaffinity separation and a detection step, liquid chromatography combined with electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS). In particular, the selected reaction monitoring mode was used for its extremely high degree of selectivity and the stable-isotope-dilution assay for its high precision of quantification. The developed method was characterized with a high precision (≤ 7.7%, determined as RSD), an acceptable accuracy (90.4-93.7%, determined as recovery), a low limit of detection (≤ 2 pg/ml EBC) and a low limit of quantification (≤ 10 pg/ml EBC). It was compared to other simple, clinically appropriate combinations of pre-treatment methods (solid phase extraction and lyophilization) with LC/MS. Finally, the method (a combination of immunoaffinity separation with LC-MS) was successfully tested in a clinical study where a significant difference was found in the concentration levels of cysteinyl leukotrienes between patients with occupational bronchial asthma and healthy subjects.
authors: Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic.
authors: Kamila
authors: K
authors: Syslová
authors: Petr
authors: P
authors: Kačer
authors: Beáta
authors: B
authors: Vilhanová
authors: Marek
authors: M
authors: Kuzma
authors: Petra
authors: P
authors: Lipovová
authors: Zdenka
authors: Z
authors: Fenclová
authors: Jindřiška
authors: J
authors: Lebedová
authors: Daniela
authors: D
authors: Pelclová
mesh_terms: D000293:Adolescent; D001249:Asthma / Q000175:diagnosis*; D001944:Breath Tests / Q000379:methods*; D002853:Chromatography, Liquid / Q000379:methods*; D003545:Cysteine / Q000032:analysis*; D045853:Exhalation; D005260:Female; D006801:Humans; D007118:Immunoassay / Q000379:methods*; D015289:Leukotrienes / Q000032:analysis*; D008297:Male; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D055815:Young Adult
chemical_list: D015289:Leukotrienes; C112381:cysteinyl-leukotriene; D003545:Cysteine