Full-scan accurate mass selectivity of ultra-performance liquid chromatography combined with time-of-flight and orbitrap mass spectrometry in hormone and veterinary drug residue analysis

  • E. van der Heeft
  • Y. J. C. Bolck
  • B. Beumer
  • A. W. J. M. Nijrolder
  • A. A. M. Stolker
  • M. W. F. Nielen
Article

Abstract

The applicability of ultra-performance liquid chromatography (UPLC) combined with full-scan accurate mass time-of-flight (TOF) and Orbitrap mass spectrometry (MS) to the analysis of hormone and veterinary drug residues was evaluated. Extracts from blank bovine hair were fortified with 14 steroid esters. UPLC-Orbitrap MS performed at a resolving power of 60,000 (FWHM) enabled the detection and accurate mass measurement (<3 ppm error) of all 14 steroid esters at low ng/g concentration level, despite the complex matrix background. A 5 ppm mass tolerance window proved to be essential to generate highly selective reconstructed ion chromatograms (RICs) having reduced background from the hair matrix. UPLC-Orbitrap MS at a lower resolving power of 7500 and UPLC-TOFMS at mass resolving power 10,000 failed both to detect all of the steroid esters in hair extracts owing to the inability to mass resolve analyte ions from co-eluting isobaric matrix compounds. In a second application, animal feed extracts were fortified with coccidiostats drugs at levels ranging from 240 to 1900 ng/g. UPLC-Orbitrap MS conducted at a resolving power of 7500 and 60,000 and UPLC-TOFMS detected all of the analytes at the lowest investigated level. Thanks to the higher analyte-to-matrix background ratio, the utilization of very narrow mass tolerance windows in the RIC was not required. This study demonstrates that even when the targeted sample preparation from conventional LC-MS/MS is applied to UPLC with full-scan accurate mass MS, false compliant (false negative) results can be obtained when the mass resolving power of the MS is insufficient to separate analyte ions from isobaric co-eluting sample matrix ions. The current trend towards more generic and less selective sample preparation is expected to aggravate this issue further.

Supplementary material

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Supplementary material, approximately 342 KB.

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Copyright information

© American Society for Mass Spectrometry 2009

Authors and Affiliations

  • E. van der Heeft
    • 1
  • Y. J. C. Bolck
    • 1
  • B. Beumer
    • 1
  • A. W. J. M. Nijrolder
    • 1
  • A. A. M. Stolker
    • 1
  • M. W. F. Nielen
    • 1
    • 2
  1. 1.RIKILT Institute of Food SafetyWageningenThe Netherlands
  2. 2.Laboratory of Organic ChemistryWageningen UniversityWageningenThe Netherlands

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