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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:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2018

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 431 (In Vitro Skin Corrosion: Reconstructed Human Epidermis (RHE) Test Method)
Deviations:
yes
Remarks:
Incorrect project number assigned to study- This deviation was considered not to affect the purpose or integrity of the study as the required study type was performed on each Test Item
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Specific details on test material used for the study:
Identification: OK (640-2) (Furoxy Hydroxy)
CAS number: 56271-94-4
Batch: G316533
Purity: 94.032% w/w
Physical state/Appearance: Cream colored solid
Expiry Date: 25 March 2018
Storage Conditions: Approximately 4 oC in the dark

In vitro test system

Test system:
human skin model
Source species:
human
Cell type:
non-transformed keratinocytes
Cell source:
foreskin from multiple donors
Source strain:
other:
Vehicle:
unchanged (no vehicle)
Details on test system:
RECONSTRUCTED HUMAN EPIDERMIS (RHE) TISSUE
- Model used: Mattrek EpiDerm
- Tissue batch number(s): 25848
- Shipping date:
- Delivery date: 10 -10 2017
- Date of initiation of testing: 11-10-2017

TEMPERATURE USED FOR TEST SYSTEM
- Temperature used during treatment / exposure: 37C
- Temperature of post-treatment incubation (if applicable): 37C

REMOVAL OF TEST MATERIAL AND CONTROLS
-Volume and number of washing steps: Rinsing was
achieved by filling and emptying each tissue under a constant soft stream of Dulbecco’s
Phosphate Buffered Saline (DPBS) to gently remove any residual test item.
- Observable damage in the tissue due to washing: NO
- Modifications to validated SOP: NO

MTT DYE USED TO MEASURE TISSUE VIABILITY AFTER TREATMENT / EXPOSURE
- MTT concentration: 1 mg/mL
- Incubation time: 3 hrs
- Spectrophotometer: Labtech LT-4500 microplate reader.
- Wavelength: 570nm
- Filter: not given
- Filter bandwidth: not given
- Linear OD range of spectrophotometer: not given

FUNCTIONAL MODEL CONDITIONS WITH REFERENCE TO HISTORICAL DATA
The results of the assay are considered acceptable if the following assay acceptance criteria
are achieved:
Negative Control
The absolute OD570 of the negative control treated tissues in the MTT-test is an indicator of
tissue viability obtained in the testing laboratory after the shipping and storing procedure and
under specific conditions of the assay. The mean OD570 of the two negative control tissues
should be ≥ 0.8 and ≤ 2.8 for each exposure time, which ensures that the tissue viability
meets the acceptance criteria.
Positive Control
Potassium Hydroxide 8.0N solution is used as a positive control. An assay meets the
acceptance criterion if mean relative tissue viability of the 60-Minute positive control is
< 15%.
Coefficient of Variation
In the range 20 and 100% viability, the Coefficient of Variation between tissue replicates
should be ≤ 30%.
NUMBER OF REPLICATE TISSUES:

CONTROL TISSUES USED IN CASE OF MTT DIRECT INTERFERENCE
- Fresh tissues / killed tissues
- Procedure used to prepare the killed tissues (if applicable):
- N. of replicates : 2
- Method of calculation used: mean and standard deviation

NUMBER OF INDEPENDENT TEST SEQUENCES / EXPERIMENTS TO DERIVE FINAL PREDICTION: One

PREDICTION MODEL / DECISION CRITERIA (choose relevant statement)
- The test substance is considered to be corrosive to skin if [complete, e.g. the viability after 3 minutes exposure is less than 50%, or if the viability after 3 minutes exposure is greater than or equal to 50 % and the viability after 1 hour exposure is less than 15%.]
- The test substance is considered to be non-corrosive to skin if [complete, e.g. the viability after 3 minutes exposure is greater than or equal to 50% and the viability after 1 hour exposure is greater than or equal to 15%.]
Control samples:
yes, concurrent negative control
yes, concurrent positive control
yes, concurrent MTT non-specific colour control
Amount/concentration applied:
25 mg
Duration of treatment / exposure:
3 minuts and 60 minutes
Number of replicates:
2 (two)

Results and discussion

In vitro

Resultsopen allclose all
Irritation / corrosion parameter:
% tissue viability
Run / experiment:
3 minutes
Value:
ca. 104.2
Vehicle controls validity:
not applicable
Negative controls validity:
valid
Positive controls validity:
valid
Remarks on result:
no indication of irritation
Irritation / corrosion parameter:
% tissue viability
Run / experiment:
60 minutes
Value:
ca. 103.2
Vehicle controls validity:
not applicable
Negative controls validity:
valid
Positive controls validity:
valid
Remarks on result:
no indication of irritation

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Conclusions:
The test item was considered to be non-corrosive to the skin.