A hand immersion test under laboratory-controlled usage conditions: the need for sensitive and controlled assessment...

Area of Science:

• Dermatology
• Cosmetic Science
• Biotechnology

Background:

• Historically, exaggerated test conditions were used for detergent product cutaneous tolerance.
• Advancements in biometric methods necessitate more realistic testing protocols.

Purpose of the Study:

• To describe a hand immersion test under controlled, realistic usage conditions.
• To evaluate the cutaneous tolerance of two different hand dishwashing liquids.

Main Methods:

• Panelists performed a 4-day hand immersion test (2x daily, 10 min each) with diluted detergent products.
• Skin assessments included visual scoring, Corneometer CM800, Skicon 200, and tape stripping (squamometry).
• Products were randomized between dominant and non-dominant hands.

Main Results:

• Visual scoring of erythema and dryness did not differentiate between products.
• Dominant hands showed significantly higher susceptibility to skin alterations.
• Skin electrical measurements and squamometry revealed significant product differences.

Conclusions:

• A realistic hand immersion test can effectively discriminate between detergent products.
• Sensitive biometric methods are crucial for detecting subtle skin changes.
• The study highlights the importance of considering hand dominance in skin tolerance testing.