Validation and assessment of an antibiotic-based, aseptic decontamination manufacturing protocol for therapeutic,...

Area of Science:

• Ophthalmology
• Microbiology
• Biomaterials Science

Background:

• Amniotic membrane (AM) is a valuable therapeutic agent for ophthalmic conditions.
• Natural microbial contamination in AM from caesarean sections necessitates effective decontamination during processing.
• Current processing methods must ensure the sterility of AM for clinical use.

Purpose of the Study:

• To evaluate the efficacy of antibiotic decontamination during low-temperature vacuum-drying of AM.
• To assess the removal of microbial bioburden at various processing stages.
• To determine the antibacterial activity of the processed AM against a panel of clinically relevant bacteria.

Main Methods:

• Assessed baseline bioburden of caesarean section-derived AM.
• Artificially inoculated AM with Staphylococcus epidermidis at different processing steps.
• Evaluated decontamination efficiency of the vacuum-drying process.
• Determined antibacterial activity using minimum inhibitory/biocidal concentrations (MIC/MBC) and disc diffusion assays.

Main Results:

• Caesarean section AM exhibited low levels of natural bioburden.
• The vacuum-drying process, particularly antibiotic treatment and drying steps, was highly effective in removing introduced microbial contamination.
• Non-antibiotic treated AM showed minimal antibacterial activity.
• Vacuum-dried AM with antibiotic treatment demonstrated broad-spectrum antibacterial capacity against Gram-positive and Gram-negative bacteria, including resistant strains.

Conclusions:

• Antibiotic decontamination is a reliable method for sterilizing AM.
• The vacuum-drying process effectively removes microbial contamination from AM.
• The resulting vacuum-dried amniotic membrane (VDAM) possesses significant and broad-spectrum antibacterial properties, making it suitable for ophthalmic applications.