Amniotic membrane allografts maintain key biological properties post SCCO₂ and lyophilization processing.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Ophthalmology

Background:

• Amniotic membrane (AM) promotes wound healing due to growth factors and extracellular matrix (ECM).
• Current AM processing and sterilization methods can degrade its beneficial biological components.
• Cryopreserved AM requires specialized storage, limiting its use in resource-limited settings.

Purpose of the Study:

• To evaluate supercritical carbon dioxide (SCCO₂) as a sterilization method for lyophilized AM.
• To compare the biochemical properties and biocompatibility of SCCO₂-sterilized AM with conventional AM products.

Main Methods:

• Lyophilization of AM followed by sterilization using SCCO₂.
• Biochemical analysis to assess ECM protein and growth factor content.
• In vitro biocompatibility assays to evaluate cellular response.

Main Results:

• SCCO₂ sterilization effectively sterilized lyophilized AM without compromising ECM proteins or growth factors.
• Lyophilized AM sterilized with SCCO₂ demonstrated comparable biochemical properties to commercially available cryopreserved AM.
• SCCO₂-treated AM exhibited similar biocompatibility and cellular support as conventional AM.

Conclusions:

• SCCO₂ sterilization is a viable method for processing AM, preserving its inherent therapeutic properties.
• Lyophilized AM sterilized via SCCO₂ offers a stable, room-temperature-storable alternative to cryopreserved AM.
• This technology enhances the clinical accessibility of AM grafts, particularly in austere environments.