Ozone as a method for decontamination of dissolving microneedles for clinical use

Dissolving microneedles (DMNs) is a promising technology for transdermal and intradermal drug delivery. However, effective decontamination protocols are necessary to ensure safety and efficacy in clinical applications. The challenge is to use a technique that preserves mechanical properties, does not introduce chemicals, and can decontaminate DMNs without affecting the drug. With its potent antimicrobial properties and minimal residual effects, ozone presents a novel and safe method for decontaminating DMNs. Specifically, the present study assesses ozone's efficacy in decontaminating DMNs loaded with aminolevulic acid, intended for photodynamic therapy in skin cancer treatment. The results showed that it effectively decontaminates E. coli and S. aureus without compromising the polymer properties or promoting drug degradation. Overall, ozone represents an approach that can be adopted to decontaminate DMNs, offering a safer and effective strategy that enhances their potential to translate to clinical application.