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Skin irritation / corrosion

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Administrative data

skin corrosion: in vitro / ex vivo
Type of information:
experimental study
Adequacy of study:
key study
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
Experimental study based on guideline OECD 431

Data source

Reference Type:
study report
Report Date:

Materials and methods

Test guideline
according to
OECD Guideline 431 (In Vitro Skin Corrosion: Reconstructed Human Epidermis (RHE) Test Method)
Version / remarks:
29th July 2016
GLP compliance:
yes (incl. certificate)

Test material

Details on test material:
- Name of test material (as cited in study report): Benzylidenchlorid
No more data available

In vitro test system

Test system:
human skin model
Source species:
Cell type:
non-transformed keratinocytes
Cell source:
other: Not specified
Source strain:
not specified
Details on animal used as source of test system:
The test was carried out with the reconstituted three-dimensional human skin model EpiDerm (MatTek). This skin model consists of normal (non-cancerous), human-derived epidermal keratinocytes (NHEK) which have been cultured to form a multilayered, highly differentiated model of the human epidermis. The NHEK are cultured on chemically modified, collagen-coated cell culture inserts (Millicell). The EpiDerm skin model exhibits in vivo-like morphological and growth characteristics which are uniform and highly reproducible. It consists of organised basal, spinous, granular and cornified layers analogous to those found in vivo.
other: The NHEK are cultured on chemically modified, collagen-coated cell culture inserts (Millicell).
Control samples:
yes, concurrent negative control
yes, concurrent positive control
yes, concurrent MTT non-specific colour control
Amount/concentration applied:
6-well plates containing 0.9 mL pre-warmed assay medium per well. The 6-well plates were pre-incubated in a humidified incubator at 37 ± 1°C, 5.0% CO2 / 95% air for at least 1 h. Then the medium was replaced by 0.9 mL fresh assay medium and the surface was dried using a sterile cotton tip.
Duration of treatment / exposure:
60min experiment and 3 min experiment
Duration of post-treatment incubation (if applicable):
Number of replicates:

Results and discussion

In vitro

Irritation / corrosion parameter:
% tissue viability
Run / experiment:
60 min experiment
> 0.2 - < 1.3
Vehicle controls validity:
Negative controls validity:
Positive controls validity:
Remarks on result:
no indication of irritation

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
In this study under the given conditions the test item showed no corrosive effects. The test item is classified as “non-corrosive“.
Executive summary:

In the present study the skin corrosivity potential of Benzal chloride was analysed. Since corrosive chemicals are cytotoxic after a short time exposure to the stratum corneum of the epidermis the cytotoxic effects of the test item on EpiDerm, a reconstituted three-dimensional human epidermis model, were determined. Hereby, the test item was applied topically. Cytotoxicity is expressed as the reduction of mitochondrial dehydrogenase activity measured by formazan production from MTT after a 3 min and 60 min exposure period and compared to those of the concurrent negative controls.

The mixture of 50 μL test item per 1 mL MTT medium showed no reduction of MTT as compared to the solvent. The mixture did not turn blue/purple. Therefore, NSMTT equaled 0%.

The mixture of 50 μL test item per 300 μL Aqua dest. and per 90 μL isopropanol showed no colouring as compared to the solvent. Therefore NSC equaled 0%.

The test item showed no non-specific reduction of MTT and no relevant colouring potential after mixture with aqua dest. and with isopropanol. Therefore, no additional controls for correction of possible false-negative results were necessary.

The test item showed no corrosive effects. The mean relative tissue viability (% negative control) was ≥ 50% (101.5%) after 3 min treatment and ≥ 15% (91.6%) after 60 min treatment.