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An ultra-sensitive online SPE-LC-MS/MS method for the quantification of levonorgestrel released from intrauterine devices

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Abstract

A selective and sensitive liquid chromatography-tandem mass spectrometry method for the determination of very low levonorgestrel (d-(−)-norgestrel) serum levels such as those found in patients using levonorgestrel-releasing intrauterine devices (IUDs) was developed. To achieve the sub-nanomolar sensitivity needed to measure such serum levels, a diethyl ether extraction sample preparation protocol was applied prior to the online solid-phase extraction-liquid chromatography-tandem mass spectrometry (SPE-LC-MS/MS) assay. Analyte quantification from the selected reaction monitoring experiments relied on the use of sixfold deuterated norgestrel as internal standard. The final method was linear up to 1.50 ng/ml with a lower limit of quantification (LLOQ) of 0.05 ng/ml. It was found to be precise and accurate with imprecision <8% and bias <6% assessed at three control levels. Total analyte recovery measured in patient pools at three concentration levels was found to exceed 92%. Matrix interferences were excluded by post-column analyte infusion experiments. As a proof of concept, a set of IUD patient serum samples was screened for their levonorgestrel content. A total of 97.5% (n = 94) of the samples did show serum levels exceeding the LLOQ, proving the applicability of the assay in relevant clinical cohorts. This method must not be used for diagnostic or therapeutic purposes, since it did not undergo formal performance evaluation in the sense of the in vitro diagnostic directive (98/79/EG) of the European community.

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Acknowledgment

The authors thank Gernot Franz and Hartwig Pfisterer for excellent technical assistance in the mass spectrometry laboratory.

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Authors and Affiliations

  1. Division of Mass Spectrometry and Chromatography, Institute of Medical and Chemical Laboratory Diagnostics (ZIMCL), University Hospital Innsbruck, Anichstr. 35, 6020, Innsbruck, Austria

    Christina Moser, Andrea Griesmacher & Christoph Seger

  2. Department of Gynecologic Endocrinology and Reproductive Medicine, Medical University of Innsbruck, 6020, Innsbruck, Austria

    Verena Mattle & Ludwig Wildt

  3. Department of Gynecology and Obstetrics, Medical University of Innsbruck, 6020, Innsbruck, Austria

    Andreas Gschließer

Authors
  1. Christina Moser
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  2. Andreas Gschließer
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  3. Verena Mattle
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  4. Ludwig Wildt
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  5. Andrea Griesmacher
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  6. Christoph Seger
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Corresponding author

Correspondence to Christoph Seger.

Additional information

Published in the special issue Analytical Sciences in Austria with Guest Editors G. Allmaier, W. Buchberger, and K. Francesconi.

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Moser, C., Gschließer, A., Mattle, V. et al. An ultra-sensitive online SPE-LC-MS/MS method for the quantification of levonorgestrel released from intrauterine devices. Anal Bioanal Chem 400, 2655–2662 (2011). https://doi.org/10.1007/s00216-011-4790-0

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  • DOI: https://doi.org/10.1007/s00216-011-4790-0

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