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Research ArticleResearch

Comparative Extractables Study of Autoclavable Polyethersulfone Filter Cartridges for Sterile Filtration

Roberto Menzel, Ina Pahl, Thomas Loewe and Armin Hauk
PDA Journal of Pharmaceutical Science and Technology May 2018, 72 (3) 298-316; DOI: https://doi.org/10.5731/pdajpst.2017.008367
Roberto Menzel
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  • For correspondence: roberto.menzel@sartorius.com
Ina Pahl
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Thomas Loewe
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Armin Hauk
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Abstract

Sterile filters are ubiquitous in biopharmaceutical manufacturing processes. Because such filters are in direct contact with the process fluid, profiling of the extractables is of utmost importance. The work presented here reveals the extractables profile from filter cartridges for sterilizing-grade filtration, which were obtained from six different vendors. All filters contain a 0.2 μm polyethersulfone membrane for sterile filtration combined with a polyethersulfone pre-filter with retention rates spanning from 0.4 to 0.6 μm. These filter cartridges are designed for use in stainless steel housings which allow for in-line steam sterilization. A combination of different analytical techniques such as (headspace) gas chromatography-mass spectrometry, ultra-performance liquid chromatography–high-resolution mass spectrometry (electrospray ionization), inductively coupled plasma mass spectrometry, total organic carbon, non-volatile residue, conductivity, and pH value were applied to develop a comprehensive extractables profile on a qualitative and semi-quantitative basis. Pure ethanol and purified water were used as extraction media. The extractables profile consisted of various polyolefin-related extractables, additives such as antioxidants and degradation products thereof, hydrocarbons, and processing aids in addition to membrane-related extractables.

LAY ABSTRACT: Filter cartridges or other filter products for sterile filtration are currently most commonly made of polymeric materials such as polypropylene, and a filter membrane material such as polyethersulfone. These materials will usually release chemical substances upon extraction in the laboratory (extractables), or upon application in biopharmaceutical processing (leachables). Potential extractables and leachables are additives used to tailor the physicochemical properties and to protect the polymeric materials, or degradants of these substances, or they arise from substances used during the manufacturing of the filter cartridges. Multiple analytical techniques were applied here to investigate the concentration and chemical nature of extractables obtained upon application of two distinct extraction solvents. Typical extractables found were antioxidants or releasing agents in addition to compounds originating from the polyethersulfone membrane.

  • Filter cartridges
  • Sterilizing-grade filtration
  • Extractables profile
  • Plastic additives
  • Polyethersulfone membrane
  • UPLC-HRMS (QToF)
  • Antioxidant degradation
  • © PDA, Inc. 2018
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PDA Journal of Pharmaceutical Science and Technology: 72 (3)
PDA Journal of Pharmaceutical Science and Technology
Vol. 72, Issue 3
May/June 2018
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Comparative Extractables Study of Autoclavable Polyethersulfone Filter Cartridges for Sterile Filtration
Roberto Menzel, Ina Pahl, Thomas Loewe, Armin Hauk
PDA Journal of Pharmaceutical Science and Technology May 2018, 72 (3) 298-316; DOI: 10.5731/pdajpst.2017.008367
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Keywords

  • Filter cartridges
  • Sterilizing-grade filtration
  • Extractables profile
  • Plastic Additives
  • Polyethersulfone Membrane
  • UPLC-HRMS (QTOF)
  • Antioxidant Degradation

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Comparative Extractables Study of Autoclavable Polyethersulfone Filter Cartridges for Sterile Filtration
Roberto Menzel, Ina Pahl, Thomas Loewe, Armin Hauk
PDA Journal of Pharmaceutical Science and Technology May 2018, 72 (3) 298-316; DOI: 10.5731/pdajpst.2017.008367

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