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Research ArticleResearch

Single-Use System Integrity II: Characterization of Liquid Leakage Mechanisms

Saeedeh Aliaskarisohi, Chethan Kumar, Marc Hogreve, Nelly Montenay, Jonathan Cutting, Ashok Mundrigi and Anilkumar Paramathma
PDA Journal of Pharmaceutical Science and Technology May 2021, 75 (3) 258-272; DOI: https://doi.org/10.5731/pdajpst.2020.012088
Saeedeh Aliaskarisohi
1Product Development, Sartorius Stedim Biotech GmbH, Germany;
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Chethan Kumar
2Fluid Management Technology, Sartorius Stedim Pvt. Ltd, India;
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Marc Hogreve
3 Integrity Testing, Sartorius Stedim Biotech GmbH, Germany;
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  • For correspondence: marc.hogreve@sartorius.com
Nelly Montenay
4Sartorius Stedim Biotech, France;
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Jonathan Cutting
5Advanced Materials & Processing, Sartorius Stedim North America, Inc.;
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Ashok Mundrigi
6Sartorius Stedim Pvt. Ltd, India; and
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Anilkumar Paramathma
7Fluid Management Technology, Sartorius Stedim Pvt. Ltd, India
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Abstract

This study investigated the liquid leakage mechanism through microchannels in a flexible single-use packaging system composed of multilayer plastic film. Based on this study, a relationship between the maximum allowable leakage limit (MALL) and the loss of package integrity can be established under different use-case conditions. The MALL is defined as the greatest leak size that does not pose any risk to the product. A specifically designed liquid leak test was used to determine the leakage time, i.e., the time it takes for a package to show leakage. As a result, this method was able to determine the leak size for which no liquid leakage is observed after 30 days. This leak size varied between 2 µm and 10 µm and can be considered the MALL for liquid egress under different use-case conditions. This article also compared the MALL results of this liquid leak test with those of the microbial ingress test, showing a direct correlation between both tests. As test samples, an ethylene vinyl acetate multilayer film (300 µm thick) and a polyethylene multilayer film (400 µm thick) were cut into 50 mm patches. Before the patches were assembled in a filter holder to form a leak-tight seal, artificial leaks in sizes of 2 –25 µm were laser drilled into the center of each patch. The test units were filled aseptically with culture media and mounted vertically on the test setup. Various pressures were applied to each test unit to simulate the constraints that single-use systems may be subject to under real-world conditions. To detect the exact leakage time, electric circuits with timers were attached below each film patch. Microscopic investigations, including light microscopy and computed tomography, were used to interpret and understand the physics and geometries of the microchannels to explain any deviation from the expected results.

  • Single-use system (SUS)
  • Single-use system integrity (SUSI)
  • Liquid leak testing
  • Maximum allowable leakage limit (MALL)
  • Microbial ingress testing
  • Integrity testing
  • © PDA, Inc. 2021
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PDA Journal of Pharmaceutical Science and Technology: 75 (3)
PDA Journal of Pharmaceutical Science and Technology
Vol. 75, Issue 3
May/June 2021
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Single-Use System Integrity II: Characterization of Liquid Leakage Mechanisms
Saeedeh Aliaskarisohi, Chethan Kumar, Marc Hogreve, Nelly Montenay, Jonathan Cutting, Ashok Mundrigi, Anilkumar Paramathma
PDA Journal of Pharmaceutical Science and Technology May 2021, 75 (3) 258-272; DOI: 10.5731/pdajpst.2020.012088

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Single-Use System Integrity II: Characterization of Liquid Leakage Mechanisms
Saeedeh Aliaskarisohi, Chethan Kumar, Marc Hogreve, Nelly Montenay, Jonathan Cutting, Ashok Mundrigi, Anilkumar Paramathma
PDA Journal of Pharmaceutical Science and Technology May 2021, 75 (3) 258-272; DOI: 10.5731/pdajpst.2020.012088
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Keywords

  • Single-use system (SUS)
  • single-use system integrity (SUSI)
  • liquid leak testing
  • maximum allowable leakage limit (MALL)
  • microbial ingress testing
  • Integrity testing

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