Prion inactivation using a new gaseous hydrogen peroxide sterilisation process.

Area of Science:

• Microbiology
• Infectious Diseases
• Biochemistry

Background:

• Prions are resistant to standard decontamination, posing risks for surgical instrument reprocessing.
• Extreme chemical or heat treatments are typically required for prion inactivation.
• Low-temperature sterilization methods are needed as alternatives.

Purpose of the Study:

• To investigate the efficacy of a novel gaseous hydrogen peroxide sterilization process for prion inactivation.
• To evaluate gaseous hydrogen peroxide as a low-temperature alternative for surgical instrument decontamination.

Main Methods:

• In vitro and in vivo assays were employed to assess prion inactivation.
• The study compared the effects of gaseous hydrogen peroxide versus liquid hydrogen peroxide.
• Mechanisms of action were explored, including protein unfolding and susceptibility to proteolysis.

Main Results:

• Gaseous hydrogen peroxide demonstrated significant prion inactivation in both in vitro and in vivo models.
• Liquid hydrogen peroxide showed no effectiveness in prion inactivation.
• Gaseous peroxide induced protein unfolding and fragmentation, increasing susceptibility to protease digestion, while liquid peroxide caused protein clumping and resistance to proteases.

Conclusions:

• Gaseous hydrogen peroxide is an effective low-temperature method for prion inactivation.
• This process offers a viable alternative for decontaminating surgical instruments, especially in prion disease cases.
• The findings suggest a potential improvement in sterilization protocols for medical devices exposed to prions.