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A rapid method for determining recent sunscreen use in field studies.

David C Whiteman1, Robyn M Brown, Chunxia Xu

  • 1Division of Population and Clinical Sciences, Queensland Institute of Medical Research, P.O. Royal Brisbane Hospital, Brisbane, Herston QLD 4029, Australia. davew@qimr.edu.au

Journal of Photochemistry and Photobiology. B, Biology
|January 28, 2003
PubMed
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Researchers developed a new method to detect sunscreen on skin using swabs and spectrophotometry. This technique reliably identifies sunscreen application for up to two hours, aiding skin cancer prevention studies.

Area of Science:

  • Dermatology
  • Public Health
  • Analytical Chemistry

Background:

  • Sunscreens are crucial for preventing skin cancer and melanoma.
  • Current methods for verifying sunscreen application in studies are indirect (e.g., questionnaires).
  • An objective, non-invasive method is needed for field studies.

Purpose of the Study:

  • To develop a rapid, non-invasive method for detecting sunscreen on skin.
  • To enable objective assessment of sunscreen use in epidemiological studies.

Main Methods:

  • Skin swabbing to collect residues.
  • Elution of residues in ethanol.
  • Spectrophotometric analysis of eluted washings.
  • Validation in controlled and field studies with volunteers and children.

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Main Results:

  • Sunscreen was detectable up to 2 hours post-application for all tested brands.
  • Marginal detection was observed at 4 hours.
  • The method accurately identified sunscreen status in a field study with children.

Conclusions:

  • Spectrophotometric analysis of skin swabs is a reliable method for detecting sunscreen presence.
  • This technique can be used for up to 2 hours after application.
  • The method supports objective assessment in epidemiological research on sun protection.