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Multiresidue determination of quinolone antibiotics using liquid chromatography coupled to atmospheric‐pressure chemical ionization mass spectrometry and tandem mass spectrometry
Author(s) -
Doerge Daniel R.,
Bajic Steve
Publication year - 1995
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290091108
Subject(s) - chemistry , chromatography , mass spectrometry , tandem mass spectrometry , detection limit , atmospheric pressure chemical ionization , liquid chromatography–mass spectrometry , chemical ionization , analytical chemistry (journal) , quinolone , fragmentation (computing) , analyte , selected reaction monitoring , ionization , ion , antibiotics , organic chemistry , biochemistry , operating system , computer science
Liquid chromatography coupled to atmospheric‐pressure chemical ionization mass spectrometry and tandem mass spectrometry (MS/MS) methods for the determination and quantification of four quinolone antibiotics were adapted from a published procedure for liquid‐liquid extraction from catfish muscle and high‐performance liquid chromatographic analysis. In‐source collision‐induced dissociation was used to optimize fragmentation to produce mass spectra consisting of the protonated molecule and two characteristic fragment ions of nearly equal intensity. Selected ion monitoring of three ions per quinolone yielded sensitive detection in catfish muscle extracts (estimated instrumental detection limits 0.8‐1.7 ppb). The intensity ratios were used to confirm the presence of three of the quinolones based on the accurate agreement (⩽10% deviation) between ratios derived from fortified catfish extracts and those from standard quinolones. MS/MS was used to increase the specificity and sensitivity of analysis. Scans using constant neural loss (CNL) of 18 mass units gave a sensitive response for the quinolones suggesting that CNL scans may be applicable to multiresidue screening for unknown quinolones. MS/MS with multiple reaction monitoring of the [MH18] + transition for each quinolone yielded the highest sensitivity analysis in catfish extracts (estimated instrumental detection limits 0.08–0.16 ppb).