A practical clinical device for evaluating changes to the skin's sebum from ozone.

Area of Science:

• Dermatology
• Environmental Science
• Cosmetic Science

Background:

• Tropospheric ozone (O3) causes skin oxidative stress and lipid peroxidation.
• Increasing pollution necessitates advanced methods for evaluating cosmetic ingredients' protective capabilities.
• Existing methods for ozone exposure studies are often cumbersome.

Purpose of the Study:

• To develop a compact, user-friendly Ozone Exposure Module (OEM) for localized skin exposure.
• To validate the OEM for assessing topical product efficacy against ozone-induced skin damage.
• To provide a safe and efficient tool for clinical testing of cosmetic formulations.

Main Methods:

• An OEM was engineered to generate ozone levels exceeding 1000 ppb, simulating polluted environments.
• Squalene depletion in sebum was measured using D-squame discs post-exposure.
• Squalene monohydroperoxide (SQOOH) levels were quantified as an indicator of oxidative stress.

Main Results:

• Ozone exposure led to significant decreases in skin squalene levels.
• A tested topical formulation demonstrated a protective effect against ozone-induced squalene depletion.
• The OEM successfully simulated environmental ozone exposure conditions.

Conclusions:

• The developed OEM is a valuable research tool for controlled ozone exposure studies.
• This device facilitates the assessment of cosmetic ingredients' ability to mitigate pollution effects on skin.
• The OEM offers a safe, small, and effective method for clinical testing related to environmental skin damage.