Bacterial surface structures and wound eschar matrix

Bacterial surface structures and wound eschar matrix refers to the combined pathological components found in chronic, non-healing wounds, such as pressure ulcers and diabetic foot ulcers. The eschar matrix consists of necrotic tissue, fibrin, and denatured collagen that forms a physical barrier, preventing wound contraction and epithelialization [2]. Bacterial surface structures include the peptidoglycan cell wall, lipopolysaccharides, and the extracellular polymeric substance (EPS) matrix of biofilms, which shield pathogens from host immune responses and systemic antibiotics [3]. Therapeutic agents like cadexomer iodine target this complex by physically absorbing wound fluid to collapse the eschar matrix while simultaneously releasing antimicrobial agents to disrupt bacterial membranes [1, 4]. Enzymatic debriders, such as collagenase, specifically target the collagen anchors of the eschar to facilitate its removal and promote the formation of healthy granulation tissue [2]. Effective management of these structures is critical for reducing bioburden and transitioning a wound from a chronic inflammatory state to an active healing phase [3, 4].

Other names

Wound bed componentsNecrotic tissue and biofilmSlough and bacterial cell wallEschar-biofilm complex

Topical agents target this complex by absorbing wound exudate to physically disrupt the eschar matrix, enzymatically digesting necrotic collagen fibers that anchor dead tissue, and releasing antimicrobial ions or molecules (such as iodine or silver) that denature bacterial surface proteins and disrupt cell wall integrity [1, 2].