Capacitive Biosensing of Skin Irritants Using a Lanolin-Based Artificial Stratum Corneum Model

Area of Science:

• Biomedical Engineering
• Materials Science
• Toxicology

Background:

• Traditional skin irritation testing relies heavily on animal models, raising ethical concerns and limiting scalability.
• There is a growing need for non-animal alternatives that accurately mimic the human stratum corneum (SC) for reliable irritation assessment.

Purpose of the Study:

• To develop a rapid, indicator-free capacitive biosensing platform for detecting chemical irritants.
• To utilize a lanolin-based artificial stratum corneum (aSC) as a functional mimic of the human SC.
• To establish a physicochemical screening method for assessing skin irritation potential.

Main Methods:

• A capacitive biosensing platform was designed, integrating a lanolin-based artificial SC (aSC) membrane.
• The platform detects changes in interfacial capacitance caused by chemical exposure to the aSC.
• Skin irritation potential was quantified by monitoring the capacitance change rate (ΔC/Δt) during short exposure periods.

Main Results:

• Lanolin demonstrated effectiveness as an SC mimic, exhibiting stable baseline performance and responsive dielectric shifts.
• The biosensing platform showed sensitivity to barrier-compromising agents through real-time capacitance measurements.
• The capacitance change rate (ΔC/Δt) served as a reliable indicator of irritation potential.

Conclusions:

• The developed capacitive biosensing platform with lanolin-based aSC offers a promising non-animal alternative for skin irritation testing.
• This physicochemical screening approach enables rapid, ethical, and scalable assessment of chemical irritants.
• The technology reduces reliance on animal and cellular models while maintaining sensitivity to skin barrier disruption.