Wound environment pH

The wound environment pH refers to the hydrogen ion concentration in the microenvironment of a skin wound, which shifts from slightly acidic in healthy skin (pH 4.5–5.5) to neutral or alkaline (pH 7.4–8.9) upon injury, particularly in chronic wounds. This alkaline shift impairs healing by enhancing protease activity, bacterial growth, biofilm formation, and reducing oxygen release via the Bohr effect, while slowing fibroblast proliferation, re-epithelialization, and angiogenesis. As healing progresses in acute wounds, pH naturally decreases toward acidity (optimally around pH 4–6), promoting antimicrobial effects, collagen synthesis, and immune cell activity like macrophages. Chronic wounds remain alkaline due to factors like infection, necrosis, and impaired epithelialization, leading to stalled repair and higher infection risk. Although not a molecular target like a receptor or enzyme, modulating wound pH via acidic buffers (e.g., citric or phosphoric acid at pH 4) or pH-neutral dressings accelerates closure, reduces inflammation, and improves outcomes in preclinical models, suggesting therapeutic potential in wound management. Monitoring pH serves as a biomarker for wound chronicity and treatment response.

Other names

Wound pHwound microenvironment pHsurface wound pH