期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1218, 期 15, 页码 2098-2105出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2010.10.104
关键词
Liquid chromatography-mass spectrometry; Doping analysis; Ephedrines; Electrospray ionisation (ESI); Atmospheric pressure chemical ionisation (APCI); High pH mobile phase
资金
- Waters Corporation
Solvent systems for use with LC-MS often result in a compromise between chromatographic performance and mass spectrometric detection, exemplified here by a LC-MS/MS method development for the analysis of ephedrines in doping control. Ephedrines, frequently found in therapeutic and nutritional preparations, are among the most commonly administered doping agents in competitive sport. Improved separation of these hydrophilic, basic compounds, some of which are diastereoisomers, is achieved in reversed-phase LC by the use of a high pH mobile phase in order to suppress analyte ionisation, and thus alter their polarity, resulting in reduced peak tailing and enhanced retention. However, when coupled to an ESI-MS detector, this eluent composition generated a non-linear and poorly reproducible signal. APCI yielded greater stability and reproducibility and is here presented as an ion source for the analysis of basic compounds under conditions that suppress their ionisation. Errors as large as 49.3% were observed with ESI, compared with 15.4% generated using APCI, for pseudoephedrine over the calibration range (25-400 mu g/mL) in urine with a simple dilution and injection of samples. These data highlight the importance of suitable MS conditions for stable performance, necessary for accurate quantification, without undue compromise to the LC separation. (C) 2010 Elsevier B.V. All rights reserved.
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