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Related Experiment Videos

Threshold responses in cinnamic-aldehyde-sensitive subjects: results and methodological aspects

J D Johansen1, K E Andersen, S C Rastogi

  • 1Department of Dermatology, Gentofte Hospital, University of Copenhagen, Denmark.

Contact Dermatitis
|March 1, 1996
PubMed
Summary

Cinnamic aldehyde, a common fragrance allergen, can trigger eczema even at low cosmetic concentrations. Longer use tests are needed to accurately assess risks for sensitive individuals.

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Area of Science:

  • Dermatology
  • Toxicology
  • Allergology

Background:

  • Cinnamic aldehyde is a widely used fragrance ingredient.
  • It is also recognized as a significant contact allergen.
  • Quantitative data on its eliciting capacity is crucial for health hazard assessment.

Purpose of the Study:

  • To provide quantitative data on the eliciting capacity of cinnamic aldehyde.
  • To assess the clinical relevance and health hazard of cinnamic aldehyde exposure.
  • To determine safe usage concentrations in cosmetic products.

Main Methods:

  • Serial dilution patch tests and 6-week graded use tests were conducted.
  • Tests involved 0.02%, 0.1%, and 0.8% cinnamic aldehyde in ethanol.
  • Participants were eczema patients sensitive to cinnamic aldehyde.

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Main Results:

  • Minimum eliciting concentrations were 0.02% (patch test) and 0.1% (use test).
  • 72% of subjects developed eczema during the use test.
  • Delayed reactions (after 7 days) were observed in 46% of positive cases, suggesting standard test durations may be insufficient.

Conclusions:

  • Cinnamic aldehyde can elicit reactions at concentrations permitted in cosmetics.
  • Standard 7-day use tests may underestimate risk for volatile substances like cinnamic aldehyde.
  • A correlation exists between patch test sensitivity and use test outcomes, informing future study design and patient advice.