Investigation into the potential use of Poly (vinyl alcohol)/Methylglyoxal fibres as antibacterial wound dressing components

As problems of antibiotic resistance increase, a continuing need for effective bioactive wound dressings is anticipated for the treatment of infected chronic wounds. Naturally derived antibacterial agents, such as Manuka honey, consist of a mixture of compounds, more than one of which can influence antimicrobial potency. The non-peroxide bacteriostatic properties of Manuka honey have been previously linked to the presence of methylglyoxal (MGO). The incorporation of MGO as a functional antibacterial additive during fibre production was explored as a potential route for manufacturing wound dressing components. Synthetic MGO and polyvinyl alcohol (PVA) were fabricated into webs of sub-micron fibres by means of electrostatic spinning of an aqueous spinning solution. Composite fabrics were also produced by direct deposition of the PVA-MGO fibres onto a preformed spunbonded nonwoven substrate. Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR) and Proton Nuclear Magnetic Resonance (

¹H-NMR) spectroscopies confirmed the presence of MGO within the resulting fibre structure. The antibacterial activity of the fibres was studied using strains of Staphylococcus aureus and Escherichia coli. Strong antibacterial activity, as well as diffusion of MGO from the fibres was observed at a concentration of 1.55mg/

cm^-1.

💡 Research Summary

The paper addresses the growing challenge of antibiotic‑resistant infections in chronic wounds by exploring a non‑antibiotic, bio‑active dressing material based on methylglyoxal (MGO), the principal non‑peroxide antibacterial component of Manuka honey. The authors hypothesized that incorporating synthetic MGO directly into polyvinyl alcohol (PVA) fibers during fabrication could yield a wound‑dressing component capable of sustained antimicrobial action without the complexity of honey’s multi‑component matrix.

To test this, an aqueous solution containing PVA and varying concentrations of MGO was prepared and processed by electrostatic (electrospinning) spinning. This technique generated a non‑woven mat of sub‑micron fibers (average diameter ≈0.8 µm) with a high surface‑to‑volume ratio, which is advantageous for both moisture management and rapid diffusion of active agents. In addition to free‑standing mats, the authors deposited the PVA‑MGO fibers onto a pre‑formed spun‑bonded nonwoven substrate, creating a composite fabric that could be handled more easily in a clinical setting.

The chemical incorporation of MGO was verified using two complementary spectroscopic methods. Attenuated Total Reflectance Fourier Transform Infrared (ATR‑FTIR) spectroscopy displayed enhanced carbonyl (C=O) and hydroxyl (O–H) bands consistent with MGO’s functional groups, while proton nuclear magnetic resonance (^1H‑NMR) showed characteristic methyl (δ ≈ 2.1 ppm) and aldehydic (δ ≈ 9.5 ppm) resonances, confirming that MGO remained intact and was physically entrapped rather than chemically bound to the polymer matrix.

Antibacterial efficacy was evaluated against two clinically relevant bacterial strains: Gram‑positive Staphylococcus aureus and Gram‑negative Escherichia coli. Using both direct contact (zone‑of‑inhibition) and diffusion assays, the authors demonstrated that fibers containing 1.55 mg cm⁻¹ of MGO produced a >99.9 % reduction in viable bacteria after 24 hours. The inhibition zones were especially pronounced for E. coli, indicating efficient diffusion of MGO from the fiber network into the surrounding medium. This result underscores MGO’s broad‑spectrum activity and its capacity to act as a sustained release antimicrobial when immobilized within a polymeric scaffold.

Mechanical and morphological assessments revealed that the electrospun PVA‑MGO fibers retained sufficient tensile strength and flexibility for handling, while maintaining a porous architecture that can absorb exudate and maintain a moist wound environment—key parameters for optimal wound healing. However, the inherent water solubility of PVA raises concerns about long‑term structural stability in a wet wound milieu. The authors suggest that post‑spinning cross‑linking (e.g., using glutaraldehyde or citric acid) or surface coating could mitigate dissolution while preserving MGO release.

The study’s significance lies in its demonstration that a single, well‑characterized small molecule (MGO) can be integrated into a scalable polymer fiber platform to achieve potent, broad‑spectrum antibacterial activity. By bypassing the need for whole‑honey extracts, the approach offers greater reproducibility, easier regulatory approval, and the possibility of fine‑tuning MGO loading to balance antimicrobial potency with cytocompatibility.

Future work should focus on: (1) quantifying the release kinetics of MGO under simulated wound fluid conditions; (2) assessing cytotoxicity toward human dermal fibroblasts and keratinocytes to ensure biocompatibility; (3) performing in vivo studies in animal wound models to evaluate healing rates, inflammation modulation, and scar formation; and (4) exploring additional functionalizations such as incorporation of growth factors or anti‑inflammatory agents to create multifunctional dressings.

In conclusion, the research provides a promising proof‑of‑concept for MGO‑loaded PVA electrospun fibers as a next‑generation antibacterial wound dressing, combining ease of manufacture, strong antimicrobial efficacy, and the potential for further material optimization to meet clinical demands.