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Research ArticleResearch

Comparison of a Lyophilized Drug Product to Other Solid and Liquid Media for the Extraction of Elastomeric Oligomers from a Butyl Rubber Stopper

Steven A. Zdravkovic
PDA Journal of Pharmaceutical Science and Technology November 2017, 71 (6) 488-501; DOI: https://doi.org/10.5731/pdajpst.2016.007468
Steven A. Zdravkovic
1Pharmaceutical Product Development, Inc., Middleton, WI, USA
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Abstract

Lyophilization is commonly used to extend the shelf life of pharmaceutical products that are otherwise unstable when stored as a liquid formulation. However, the ability of a lyophilized drug, or other solid medium, to leach or extract substances from a pharmaceutical packaging material is not well characterized. To provide insight into this area of uncertainty, the extraction properties of a lyophilized drug product, the lyophilized drug product reconstituted in water, and several other solid and liquid media of varying polarity were determined using a glass vial with a butyl rubber stopper as a representative pharmaceutical packaging system. The results obtained in this study show that the extracting power of a medium, whether solid or liquid, was primarily a function of polarity. Thus, the amount of each extractable observed for the lyophilized and reconstituted drug product were in trend with the other solid and liquid media, respectively. Nevertheless, it was notable that the lyophilized drug product was able to leach substances from the stopper in quantifiable amounts, whereas the reconstituted drug product contained no detectable leachables. Using a mathematical relationship, it was determined that the extraction power of the lyophilized drug product was equivalent to a 50/50 isopropanol/water solution.

LAY ABSTRACT: Freeze drying is commonly used to extend the shelf life of pharmaceutical products that are otherwise unstable when stored as a liquid formulation. However, the propensity for substances to migrate from a pharmaceutical packaging material and into a solid drug formulation is not well characterized. To provide insight into this area of uncertainty, the migration of substances from a glass vial with a butyl rubber stopper and into a lyophilized drug product, the drug product reconstituted with water, as well as several solid and liquid media of varying polarity were assessed. The results obtained in this study show that the extracting power of a medium, whether solid or liquid, was primarily a function of polarity and thus could be related to one another. Furthermore, the results for the freeze-dried and reconstituted drug products were in trend with the other solid and liquid media tested, respectively, and showed that the freeze-dried drug was able to leach substances from the stopper in measureable amounts, whereas the reconstituted drug product contained no substances that had originated from the stopper.

  • Extractables
  • Leachables
  • Lyophilized
  • Parenteral
  • Butyl rubber oligomer
  • © PDA, Inc. 2017
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PDA Journal of Pharmaceutical Science and Technology: 71 (6)
PDA Journal of Pharmaceutical Science and Technology
Vol. 71, Issue 6
November/December 2017
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Comparison of a Lyophilized Drug Product to Other Solid and Liquid Media for the Extraction of Elastomeric Oligomers from a Butyl Rubber Stopper
Steven A. Zdravkovic
PDA Journal of Pharmaceutical Science and Technology Nov 2017, 71 (6) 488-501; DOI: 10.5731/pdajpst.2016.007468

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Comparison of a Lyophilized Drug Product to Other Solid and Liquid Media for the Extraction of Elastomeric Oligomers from a Butyl Rubber Stopper
Steven A. Zdravkovic
PDA Journal of Pharmaceutical Science and Technology Nov 2017, 71 (6) 488-501; DOI: 10.5731/pdajpst.2016.007468
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Keywords

  • Extractables
  • Leachables
  • Lyophilized
  • Parenteral
  • Butyl rubber oligomer

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