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Validating a low dose gamma irradiation process for sterilizing allografts using ISO 11137 method 2B.

Thomas F Baker1, Chad J Ronholdt, Simon Bogdansky

  • 1AlloSource, 6278, S. Troy Circle, Centennial, CO 80111, USA. tbaker@allosource.org

Cell and Tissue Banking
|November 26, 2005
PubMed
Summary

This study validated a sterilization method for human allografts using gamma irradiation. A minimum dose of 9.2 kGy is required to achieve sterility (10^-6 SAL) for allograft tissues.

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Area of Science:

  • Biomedical Engineering
  • Sterilization Science
  • Tissue Banking

Background:

  • Sterilization of allografts is crucial for patient safety.
  • Established methods must be validated for specific processing environments.
  • AlloSource utilizes specific processing methods requiring tailored validation.

Purpose of the Study:

  • To validate an allograft sterilization method at AlloSource.
  • To determine the minimum effective radiation dose for sterilizing human allografts.
  • To comply with ISO Standard 11137 for sterilization validation.

Main Methods:

  • Followed ISO Standard 11137, Method 2B.
  • Dosed 300 allografts across five incremental doses (1-5 kGy).
  • Performed sterility testing on dosed allografts to detect viable microorganisms.

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Main Results:

  • Calculated a verification dose of 1.27 kGy based on sterility test results.
  • Verified the dose with an additional batch of 100 allografts.
  • Determined that a minimum dose of 9.2 kGy ensures sterility (10^-6 SAL) for human allografts using gamma 60Co radiation.

Conclusions:

  • The validated sterilization method ensures the safety and efficacy of human allografts.
  • Gamma irradiation at 9.2 kGy is effective for sterilizing allograft tissue.
  • The study provides critical data for AlloSource's allograft processing protocols.