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Composition of Brazilian and Chinese Propolis for Patch Testing.
Evelyn Calta1, Anton de Groot2, Emma M van Oers3
1Kurt Kitzing GmbH, Wallerstein, Germany.
Contact Dermatitis
|April 2, 2025
Summary
Patch testing reveals significant differences in reactivity between Brazilian and Chinese propolis. Chemical analysis confirms distinct volatile compositions, suggesting this may explain varying allergic responses.
Area of Science:
- Analytical Chemistry
- Dermatology
- Natural Products Chemistry
Background:
- Patch testing in Amsterdam (2024) showed high positive reactions (>20%) to Brazilian propolis versus low reactivity (3.5%) to Chinese propolis.
- Differences in propolis composition were hypothesized as the cause for varying patch test results.
Purpose of the Study:
- To analyze the chemical composition of Brazilian and Chinese propolis samples used in commercial allergy testing.
- To investigate how different enrichment times affect the qualitative and quantitative composition of Brazilian propolis.
Main Methods:
- Volatile components of propolis samples were analyzed using gas chromatography-mass spectrometry/flame ionization detection (GC-MS/FID).
- Headspace solid-phase microextraction (SPME) was employed to obtain volatile compounds for analysis.
Main Results:
- Significant compositional differences were identified between Brazilian and Chinese propolis samples.
- Brazilian propolis was rich in hydrocinnamic acid (16.9%), (E)-nerolidol (7.41%), spathulenol (5.45%), and junenol (4.01%).
- Chinese propolis contained major compounds such as (E)-cinnamyl alcohol (8.08-24.96%), 2-phenethyl alcohol (8.93-11.25%), α-curcumene (8.77-8.81%), and guaiol (5.96-5.72%).
Conclusions:
- The volatile chemical profiles of Brazilian and Chinese propolis used in patch testing are markedly different.
- Further research is required to determine if these compositional variations are responsible for the observed differences in patch test reactivity.
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