Rapid blister formation in human skin with ammonium hydroxide

Area of Science:

• Dermatology
• Toxicology
• Biomedical Engineering

Background:

• The stratum corneum's barrier function is crucial for skin health.
• Assessing cutaneous irritability is vital for product safety and dermatological research.
• Existing methods for evaluating skin irritation can be invasive or time-consuming.

Purpose of the Study:

• To introduce a novel, minimally invasive method for inducing intra-epidermal blisters on human skin.
• To establish the Minimal Blistering Time (MBT) as a reliable indicator of cutaneous irritability.
• To explore the utility of induced blisters for subsequent analyses.

Main Methods:

• Topical application of a 1:1 ammonium hydroxide solution to human skin.
• Utilizing a well-drilled into a plastic block to standardize the application area.
• Measuring the time required to provoke an intra-epidermal blister (Minimal Blistering Time).
• Correlating MBT with sodium lauryl sulphate-induced dermatitis intensity.

Main Results:

• Ammonium hydroxide reliably induced intra-epidermal blisters in an average of 13 minutes.
• Minimal Blistering Time (MBT) ranged from 3 to 57 minutes, increasing with stratum corneum thickness.
• MBT showed a strong correlation with the intensity of sodium lauryl sulphate-induced dermatitis.
• Induced blisters were virtually painless, with slight inflammation and rapid healing without scarring.

Conclusions:

• The ammonium hydroxide-induced blister model provides a reproducible and minimally invasive method for assessing skin.
• Minimal Blistering Time (MBT) is a validated, objective measure of cutaneous irritability.
• This technique facilitates physico-chemical analysis of the stratum corneum and studies on wound healing and infections.