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Toxicological information

Skin irritation / corrosion

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Administrative data

Endpoint:
skin corrosion: in vitro / ex vivo
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
September 26, 2017 -November 13, 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2017
Report date:
2017

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
other: Council Regulation (EC) No. 440/2008 laying down test methods pursuant to Regulation (EC) No. 1907/2006. B.40.bis. In vitro skin corrosion: human skin model test
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 431 (In Vitro Skin Corrosion: Reconstructed Human Epidermis (RHE) Test Method)
Version / remarks:
July 29, 2016
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: INVITTOX Protocol SkinEthic Skin Corrosivity Test, April 2012.
Deviations:
no
GLP compliance:
yes (incl. QA statement)

Test material

Constituent 1
Chemical structure
Reference substance name:
4-(Difluoro-(3,4,5-trifluoro-phenoxy)-methyl)-3,5-difluoro-benzaldehyde
EC Number:
942-738-4
Molecular formula:
C14H5F7O2
IUPAC Name:
4-(Difluoro-(3,4,5-trifluoro-phenoxy)-methyl)-3,5-difluoro-benzaldehyde

In vitro test system

Test system:
human skin model
Source species:
human
Cell type:
non-transformed keratinocytes
Cell source:
foreskin from a single donor
Justification for test system used:
standard model
Vehicle:
unchanged (no vehicle)
Remarks:
No vehicle used in this study; The test item was applied neat to the tissues.
Details on test system:
CELL CULTURE
- Supplier: EpiSkin/SkinEthic Laboratories, Lyon, France)
- Source: human keratinocytes cultured on a polycarbonate filter in conditions which permit their terminal differentiation
- Format: 24 well plate
- Batch: 17-RHE-108
- Expires: October 30, 2017

TEMPERATURE USED FOR TEST SYSTEM
- Temperature used during treatment: room temperature
- Temperature of post-treatment incubation: 37°C

REMOVAL OF THE TEST MATERIAL AND CONTROL
At the end of the exposure periods, the test item, positive and negative control was removed immediately by gently rinsing with a minimum volume of 20 mL DPBS using a pipette. Excess DPBS was removed by gently shaking the tissue inserts and blotting the bottom of the tissue inserts with blotting paper.

Control samples:
yes, concurrent negative control
Amount/concentration applied:
TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 20 mg ± 3 mg of solid test material
- Concentration (if solution): n/a

VEHICLE
- Amount(s) applied (volume or weight with unit): n/a
- Concentration (if solution): n/a
- Lot/batch no. (if required): n/a
- Purity: n/a

NEGATIVE CONTROL
- Amount(s) applied (volume or weight): 40 µL ± 3 µl (deionised water )
- Concentration (if solution): n/a

POSITIVE CONTROL
- Amount(s) applied (volume or weight): 40 µL ± 3 µl
- Concentration (if solution): An 8N potassium hydroxide solution dissolved deionised water pure was used as positive control.
Duration of treatment / exposure:
3 min & 1 hour
Number of replicates:
2

Results and discussion

In vitro

Resultsopen allclose all
Irritation / corrosion parameter:
% tissue viability
Run / experiment:
Experiment 1 / Run 1 (3 min)
Value:
98.6
Vehicle controls validity:
not applicable
Remarks:
The test item was applied neat to the tissues
Negative controls validity:
valid
Positive controls validity:
valid
Remarks on result:
other: Non-corrosive
Irritation / corrosion parameter:
% tissue viability
Run / experiment:
Experiment 1 / Run 1 (1 hour)
Value:
99.6
Vehicle controls validity:
not applicable
Remarks:
The test item was applied neat to the tissues
Negative controls validity:
valid
Positive controls validity:
valid
Remarks on result:
other: Non-corrosive
Other effects / acceptance of results:
OTHER EFFECTS:
- Visible damage on test system: none
- Direct-MTT reduction: none
- Colour interference with MTT: none

ACCEPTANCE OF RESULTS:

Acceptability of the Quality Control Data of the Skin Model with Reference to Historical Batch Data:
The negative control OD values were 1.719, 1.745, 1.743 and 1.661 and, thus, in the range of ≥0.8 and ≤3.0.

Acceptability of the Positive and Negative Control Data:
After treatment with the positive control (potassium hydroxide, 8N) the mean viability value was 0.5% and, thus, lower than the historically established threshold of 0.97%.
After treatment with the negative control (deionised water) the mean ODs were 1.731 (3 minute exposure) and 1.703 (1 hour exposure) and, thus, higher than the historically established thresholds of 1.590 and 1.468, respectively.

Negative Control, Positive Control and Test Substance Data Acceptance Criteria:
The range between identically treated tissues with the negative control was less than 30% after 3 minutes exposure (1.4%) and after 1 hour exposure (5.1%).
The range between identically treated tissues with the positive control was higher than 30% after 1 hour exposure (50.0%), but the optical densities measured were <0.3.
The range between identically treated tissues with the test item was less than 30% after 3 minutes exposure (0.3%) and after 1 hour exposure (7.2%).


The study met all acceptance criteria.




Any other information on results incl. tables

 Group Time / [min]  Mean OD  Mean Relative viability / [%]
 Negative Control 3 1.731 100.0 
Negative Control 60

1.703

100.0

 Positive Control

60

0.009

0.5

 Test Material 3 1.706 98.6
 Test Material 60 1.696 99.6

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Conclusions:
This study was performed according to GLP and the methods applied are fully compliant with OECD TG 431. Under the conditions of the present study, the test item is not considered to possess a corrosive potential to skin.
Executive summary:

This study was performed according to GLP and the methods applied are fully compliant with OECD TG 431. Under the conditions of the present study, the test item is not considered to possess a corrosive potential to skin.