Bacillus subtilis in PVA Microparticles for Treating Open Wounds

Area of Science:

• Biomaterials Science
• Microbiology
• Wound Healing Research

Background:

• Open wound management faces challenges with bacterial contamination, particularly from resistant strains like MRSA.
• Traditional dressings struggle to maintain a moist environment while preventing infection and further damage.

Purpose of the Study:

• To develop and evaluate a novel wound treatment using live Bacillus subtilis (B. subtilis) encapsulated in polyvinyl alcohol (PVA) microparticles.
• To assess the antibacterial efficacy and wound healing potential of B. subtilis-loaded PVA microparticles against Staphylococcus aureus and MRSA.

Main Methods:

• Polyvinyl alcohol (PVA) microparticles loaded with live B. subtilis were fabricated using spray-drying.
• Microparticles were applied directly to open wounds in in vivo experiments.
• Antibacterial activity against MRSA and S. aureus was tested.
• Wound healing time and adverse effects were monitored over 15 days.

Main Results:

• B. subtilis within PVA microparticles exhibited significant antibacterial activity against MRSA and S. aureus.
• Both B. subtilis and empty PVA microparticles reduced wound healing time.
• B. subtilis microparticles demonstrated superior efficacy in the initial week of healing.
• No adverse effects such as skin irritation or infection were observed.

Conclusions:

• Live B. subtilis encapsulated in PVA microparticles represent a promising therapeutic strategy for open wounds.
• This delivery system effectively combats bacterial infections, including those caused by resistant strains.
• The combination of a supportive delivery system with live, secreting bacteria offers a novel approach for infectious skin disorders.