Non-specific hydrated biomolecules in biofilms and necrotic tissue

Non-specific hydrated biomolecules in biofilms and necrotic tissue represent a complex, heterogeneous target consisting of extracellular polymeric substances (EPS), proteins, lipids, and extracellular DNA (eDNA) (Flemming et al., Nature Reviews Microbiology, 2010). These components form a protective matrix for microbial colonies and a physical barrier in non-healing wounds, such as eschar or slough (Schultz et al., Wound Repair and Regeneration, 2003). The high water content (hydration) of these matrices is a key physical characteristic often exploited by medical devices, such as Er:YAG lasers, for selective ablation (Parker, British Dental Journal, 2007). Pharmacological intervention typically involves enzymatic debriding agents like collagenase or bromelain, which catalyze the breakdown of structural proteins to facilitate tissue clearance (FDA, Santyl Label; EMA, NexoBrid Summary). Additionally, surfactants and oxidative agents are used to disrupt the molecular integrity of the biofilm matrix, enhancing the penetration of antimicrobial therapies (Percival et al., Journal of Wound Care, 2017). Targeting these biomolecules is essential for transitioning a chronic, stalled wound into an active healing phase and for eradicating persistent infections.

Other names

Extracellular polymeric substances (EPS)Biofilm matrixNecrotic debrisSloughEscharWound bed slough

The mechanism of action involves the proteolytic degradation of structural proteins (e.g., collagen) by enzymes like collagenase (FDA, Santyl Label), the oxidative disruption of molecular bonds by agents like hydrogen peroxide (Finnegan et al., Journal of Wound Care, 2010), and the reduction of surface tension by surfactants to detach biofilms (Percival et al., Journal of Wound Care, 2017). Physical modalities like lasers target the high water content of these biomolecules to achieve selective photothermal ablation (Parker, British Dental Journal, 2007).