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Título

Determination of estrogens and progestogens by mass spectrometric techniques (GC/MS, LC/MS and LC/MS/MS)

AutorDíaz-Cruz, M. Silvia; López de Alda, Miren; López, Ramón; Barceló, Damià
Palabras claveSteroid sex hormones
Estrogens
Progestogens
Mass spectrometric techniques
Aquatic environment
Fecha de publicación8-ago-2003
EditorWiley-Blackwell
CitaciónJournal of Mass Spectrometry 38(9): 917-923 (2003)
ResumenSteroid sex hormones and related synthetic compounds have been shown to provoke alarming estrogenic effects in aquatic organisms, such as feminization, at very low concentrations (ng/L or pg/L). In this work, different chromatographic techniques, namely, gas chromatography/mass spectrometry (GC/MS), liquid chromatography/mass spectrometry (LC/MS) and liquid chromatography/tandem mass spectrometry (LC/MS/MS), are discussed for the analysis of estrogens, both free and conjugated, and progestogens, and the sensitivities achieved with the various techniques are inter-compared. GC/MS analyses are usually carried out after derivatization of the analytes with bis(trimethylsilyl)trifluoroacetamide (BSTFA). For LC/MS and LC/MS/MS analyses, different instruments, ionization techniques (electrospray (ESI) and atmospheric pressure chemical ionization (APCI)), ionization modes (negative ion (NI) and positive ion (PI)) and monitoring modes (selected ion monitoring (SIM) and selected reaction monitoring (SRM)) are generally employed. Based on sensitivity and selectivity, LC/ESI-MS/MS is generally the method of choice for determination of estrogens in the NI mode and of progestogens in the PI mode (instrumental detection limits (IDLs) 0.1-10 ng/mL). IDLs achieved by LC/ESI-MS in the SIM mode and by LC/ESI-MS/MS in the SRM mode were, in general, comparable, although the selectivity of the latter is significantly higher and essential to avoid false positive determinations in the analysis of real samples.
Descripción7 pages, 3 figures, 4 tables.-- PMID: 14505318 [PubMed].-- Printed version published Sep 2003.
Versión del editorhttp://dx.doi.org/10.1002/jms.529
URIhttp://hdl.handle.net/10261/19707
DOI10.1002/jms.529
ISSN1076-5174 (Print)
1096-9888 (Online)
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