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Research ArticleTechnology/Application

Automated Solid Phase Extraction (SPE) LC/NMR Applied to the Structural Analysis of Extractable Compounds from a Pharmaceutical Packaging Material of Construction

Daniel L. Norwood, James O. Mullis, Mark Davis, Scott Pennino, Thomas Egert and Nina C. Gonnella
PDA Journal of Pharmaceutical Science and Technology May 2013, 67 (3) 267-287; DOI: https://doi.org/10.5731/pdajpst.2013.00920
Daniel L. Norwood
Boehringer Ingelheim Pharmaceuticals, Inc.
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  • For correspondence: daniel.norwood@boehringer-ingelheim.com
James O. Mullis
Boehringer Ingelheim Pharmaceuticals, Inc.
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Mark Davis
Boehringer Ingelheim Pharmaceuticals, Inc.
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Scott Pennino
Boehringer Ingelheim Pharmaceuticals, Inc.
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Thomas Egert
Boehringer Ingelheim Pharmaceuticals, Inc.
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Nina C. Gonnella
Boehringer Ingelheim Pharmaceuticals, Inc.
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Abstract

The structural analysis (i.e., identification) of organic chemical entities leached into drug product formulations has traditionally been accomplished with techniques involving the combination of chromatography with mass spectrometry. These include gas chromatography/mass spectrometry (GC/MS) for volatile and semi-volatile compounds, and various forms of liquid chromatography/mass spectrometry (LC/MS or HPLC/MS) for semi-volatile and relatively non-volatile compounds. GC/MS and LC/MS techniques are complementary for structural analysis of leachables and potentially leachable organic compounds produced via laboratory extraction of pharmaceutical container closure/delivery system components and corresponding materials of construction. Both hyphenated analytical techniques possess the separating capability, compound specific detection attributes, and sensitivity required to effectively analyze complex mixtures of trace level organic compounds. However, hyphenated techniques based on mass spectrometry are limited by the inability to determine complete bond connectivity, the inability to distinguish between many types of structural isomers, and the inability to unambiguously determine aromatic substitution patterns. Nuclear magnetic resonance spectroscopy (NMR) does not have these limitations; hence it can serve as a complement to mass spectrometry. However, NMR technology is inherently insensitive and its ability to interface with chromatography has been historically challenging. This article describes the application of NMR coupled with liquid chromatography and automated solid phase extraction (SPE-LC/NMR) to the structural analysis of extractable organic compounds from a pharmaceutical packaging material of construction. The SPE-LC/NMR technology combined with micro-cryoprobe technology afforded the sensitivity and sample mass required for full structure elucidation. Optimization of the SPE-LC/NMR analytical method was achieved using a series of model compounds representing the chemical diversity of extractables. This study demonstrates the complementary nature of SPE-LC/NMR with LC/MS for this particular pharmaceutical application.

LAY ABSTRACT: The identification of impurities leached into drugs from the components and materials associated with pharmaceutical containers, packaging components, and materials has historically been done using laboratory techniques based on the combination of chromatography with mass spectrometry. Such analytical techniques are widely recognized as having the selectivity and sensitivity required to separate the complex mixtures of impurities often encountered in such identification studies, including both the identification of leachable impurities as well as potential leachable impurities produced by laboratory extraction of packaging components and materials. However, while mass spectrometry–based analytical techniques have limitations for this application, newer analytical techniques based on the combination of chromatography with nuclear magnetic resonance spectroscopy provide an added dimension of structural definition. This article describes the development, optimization, and application of an analytical technique based on the combination of chromatography and nuclear magnetic resonance spectroscopy to the identification of potential leachable impurities from a pharmaceutical packaging material. The complementary nature of the analytical techniques for this particular pharmaceutical application is demonstrated.

  • Extractables
  • Leachables
  • Structural analysis
  • LC/NMR
  • PQRI
  • Solid phase extraction
  • LC/MS
  • © PDA, Inc. 2013
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PDA Journal of Pharmaceutical Science and Technology: 67 (3)
PDA Journal of Pharmaceutical Science and Technology
Vol. 67, Issue 3
May/June 2013
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Automated Solid Phase Extraction (SPE) LC/NMR Applied to the Structural Analysis of Extractable Compounds from a Pharmaceutical Packaging Material of Construction
Daniel L. Norwood, James O. Mullis, Mark Davis, Scott Pennino, Thomas Egert, Nina C. Gonnella
PDA Journal of Pharmaceutical Science and Technology May 2013, 67 (3) 267-287; DOI: 10.5731/pdajpst.2013.00920

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Automated Solid Phase Extraction (SPE) LC/NMR Applied to the Structural Analysis of Extractable Compounds from a Pharmaceutical Packaging Material of Construction
Daniel L. Norwood, James O. Mullis, Mark Davis, Scott Pennino, Thomas Egert, Nina C. Gonnella
PDA Journal of Pharmaceutical Science and Technology May 2013, 67 (3) 267-287; DOI: 10.5731/pdajpst.2013.00920
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Keywords

  • Extractables
  • Leachables
  • Structural analysis
  • LC/NMR
  • PQRI
  • Solid phase extraction
  • LC/MS

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