Dağsuyu, Eda

ABSTRACT Biofilms hinder wound infection healing, making wound infections a healthcare challenge for which innovative treatments are needed. A 1.77 cm 2 electrochemical bandage (e-bandage), which generates the biocide hypochlorous acid (HOCl), has shown promising anti-biofilm activity in vitro , ex vivo , and in vivo . The e-bandage is a three-electrode system operationalized by a hydrogel. In addition to providing a conductive electrolyte for the electrodes, the hydrogel provides a protective barrier for the wound. How different hydrogels impact e-bandage functionality is not completely defined. Here, the in vitro activity of seven clinically available hydrogels (xanthan gum, 3M, Duoderm, Prontosan, Purilon, Skintegrity, and Solosite) was evaluated with 1.77 cm 2 HOCl-generating e-bandages using a potentiostat with a multiplexer in a membrane biofilm model against methicillin-resistant Staphylococcus aureus IDRL-6169 and Acinetobacter baumannii ATCC-17978. When applied with polarized HOCl-producing e-bandages, all evaluated hydrogels except Solosite yielded ≥5.5 log 10 CFU/cm 2 reductions in bacterial quantities after 6 h of treatment, with most being below the detection limit at that time point. Prontosan exhibited antibacterial activity independent of e-bandage. Results of this study inform the selection of clinically available hydrogels that may be suitable for use with a 1.77 cm 2 HOCl-producing e-bandage. IMPORTANCE In this study, it was shown that some clinically available hydrogels, combined with a 1.77 cm 2 HOCl-generating electrochemical bandage, deliver time-dependent antimicrobial activity against methicillin-resistant Staphylococcus aureus and Acinetobacter baumannii biofilms, offering a potential approach to treat wound infections, including those caused by antimicrobial-resistant bacteria.

ABSTRACT An electrochemical bandage (e‐bandage) that generates hydrogen peroxide (H 2 O 2 ) through a combination of working, counter and reference electrodes used with an electrolyte‐providing hydrogel is being developed for wound infection management. e‐Bandage biocidal activity was previously demonstrated using Xanthan gum hydrogel. For clinical use, clinically used hydrogels would be ideal, but their use with the described e‐bandage has not been shown. The goal of this work was to evaluate the biocidal activity of off‐the‐shelf, clinically used hydrogels when used with a 1.77 cm 2 H 2 O 2 ‐producing e‐bandage. e‐Bandage electrochemical parameters and activity against methicillin‐resistant Staphylococcus aureus IDRL‐6169 and Acinetobacter baumannii ATCC‐17978 biofilms were assessed with six off‐the‐shelf hydrogels. Variations in hydrogel composition affected electrochemical parameters, which was associated with differences in biocidal activity. Results of this study inform the selection of off‐the‐shelf hydrogels for use with H 2 O 2 ‐producing e‐bandages.