Related Experiment Video
Updated: Aug 5, 2026
06:30
Generation of a Simplified Three-Dimensional Skin-on-a-chip Model in a Micromachined Microfluidic Platform
Published on: May 17, 2021
Animal-Free Skin Sensitization Testing: In Chemico and In Silico Integrated Approach
Gabriella Lisboa Dos Santos1, Gabriela de Oliveira Prado Corrêa2, Franciane de Oliveira Cortez2
1Department of Pharmaceutical Sciences, Federal University of São Paulo, Diadema Campus, Diadema 09913-030, Brazil.
Toxics
|July 28, 2026
Summary
This study introduces an Integrated Testing Strategy (ITS) combining in chemico and in silico methods for cosmetic ingredient safety. The approach revealed complex mixtures require integrated data for accurate skin sensitization assessment, avoiding animal testing.
Area of Science:
- Toxicology
- Computational Chemistry
- Dermatology
Background:
- Cosmetic industry faces increasing bans on animal testing for product safety.
- Skin sensitization is a critical toxicological endpoint for cosmetic ingredients.
- Need for reliable, animal-free safety assessment methods is paramount.
Purpose of the Study:
- To propose and validate an Integrated Testing Strategy (ITS) for evaluating skin sensitization potential.
- To combine in chemico (Direct Peptide Reactivity Assay-DPRA) and in silico (computational panel) methods.
- To assess the sensitization potential of *Baccharis trimera* extract and its marker, 3-Caffeoylquinic acid (3-CQA).
Main Methods:
- Validated the Direct Peptide Reactivity Assay (DPRA) for experimental reliability.
- Applied a six-platform computational panel for in silico analysis.
- Integrated DPRA and in silico data to assess a botanical extract and its major component.
Main Results:
- DPRA alone was insufficient for classifying the sensitization potential of complex mixtures.
- In silico data integration was essential for interpreting the botanical matrix's reactivity.
- Sensitization in the extract likely arises from synergistic effects of lipophilic caffeoylquinic acid isomers, not solely 3-CQA.
Conclusions:
- An integrated approach combining experimental and computational methods ensures robust safety assessments.
- This animal-free strategy enables efficient early screening of cosmetic ingredients.
- The ITS refines toxicological data interpretation for complex chemical environments.
