1-(4-tert-butylphenyl)-3-(4-methoxyphenyl)propane-1,3-diol

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2011-04-19 to 2011-08-31

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2011

Report date:

2011

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method B.46 (In Vitro Skin Irritation: Reconstructed Human Epidermis Model Test)

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 439 (In Vitro Skin Irritation: Reconstructed Human Epidermis Test Method)

Version / remarks:

Adopted: 22 July 2010

Test guideline 3

Qualifier:

according to guideline

Guideline:

other: Skinethic skin irritation test -42bis Standard operating procedure (SOP) 2009

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

R,R-1-(4-tert-butyl-phenyl)-3-(4-methoxy-phenyl)-propane-1,3-diol

Molecular formula:

C20H26O3

IUPAC Name:

R,R-1-(4-tert-butyl-phenyl)-3-(4-methoxy-phenyl)-propane-1,3-diol

Constituent 2

Reference substance name:

R,S-1-(4-tert-Butyl-phenyl)-3-(4-methoxy-phenyl)-propane-1,3-diol

Molecular formula:

C20H26O3

IUPAC Name:

R,S-1-(4-tert-Butyl-phenyl)-3-(4-methoxy-phenyl)-propane-1,3-diol

Constituent 3

Reference substance name:

S,S-1-(4-tert-Butyl-phenyl)-3-(4-methoxy-phenyl)-propane-1,3-diol

Molecular formula:

C20H26O3

IUPAC Name:

S,S-1-(4-tert-Butyl-phenyl)-3-(4-methoxy-phenyl)-propane-1,3-diol

Constituent 4

Reference substance name:

S,R-1-(4-tert-Butyl-phenyl)-3-(4-methoxy-phenyl)-propane-1,3-diol

Molecular formula:

C20H26O3

IUPAC Name:

S,R-1-(4-tert-Butyl-phenyl)-3-(4-methoxy-phenyl)-propane-1,3-diol

Test material form:

solid

Details on test material:

Minimum purity 95% w/w

Specific details on test material used for the study:

Designation: Art. 132720
Synonym: Avodiol
Chem. Name: 1-(4-tert-Butyl-phenyl)-3-(4-methoxy-phenyl)-propane-1,3-diol
CAS-No.: 955359-35-0
Batch: 11/LE/016 K1
Purity: 95.1% (w/w)
Appearance: White, solid
Released until: May 18, 2012
Storage: Tightly closed, dark at room temperature (15 to 25°C)

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: SkinEthic Laboratories, Lyon, France)
- Source: human keratinocytes cultured on a polycarbonate filter in conditions which permit their terminal differentiation
- Format: 24 well plate
- Batch: 11 022A 0401


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
After the end of the treatment interval, the residual test item was removed immediately by gently rinsing with a minimum volume of 25 mL DPBS using a pipette. Excess DPBS was removed by gently shaking the inserts and blotting the bottom with blotting paper.

Control samples:

yes, concurrent negative control

Amount/concentration applied:

TEST MATERIAL: 16 mg of solid test material
NEGATIVE CONTROL: 16 µL (Dulbecco`s Phosphate-Buffered Saline)
POSITIVE CONTROL: 16 µL (5% aqueous solution of sodium dodecyl sulfate in deionised water)

Duration of treatment / exposure:

42 min (± 1 minute)

Duration of post-treatment incubation (if applicable):

42 hours (± 1 hour)

Number of replicates:

3

Results and discussion

In vitro

Results

Irritation / corrosion parameter:

% tissue viability

Run / experiment:

Experiment 1 / Run 1

Value:

2.53

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:

positive indication of irritation

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:

Negative Control:
The negative control (DPBS-buffer) OD values were 2.274, 2.217 and 2.297 (mean: 2.263, Standard Deviation: 1.80%) and, thus, in the range of ≥1.2 and ≤2.5.

After treatment with the positive control (5% aqueous solution of sodium dodecyl sulfate) the mean relative viability value was 1.02% (standard deviation: 6.01%) and fulfilled the acceptance criteria (<40%)
The standard deviation of the negative control and the positive control was ≤18%, respectively.

Test Substance Data Acceptance Criteria:
The standard deviation of the three tissues treated with the test item was 1.13% and, thus, ≤18%.

Therefore, the study fulfilled the validity criteria.

Any other information on results incl. tables

Group	Time / [min]	Mean OD	Mean Relative viability / [%]
Negative Control	42	2.263	100
Positive Control	42	0.028	1.26
Test Material	42	0.057	2.53

Applicant's summary and conclusion

Interpretation of results:

Category 2 (irritant) based on GHS criteria

Remarks:

UN GHS: No Caterory (according to OECD TG 439)

Conclusions:

This study was performed according to GLP and the methods applied are fully compliant with OECD TG 439. The test material is considered to be irritating to the skin based on the results of this in vitro assay.

Executive summary:

This study was performed according to GLP and the methods applied are fully compliant with OECD TG 439. The test material is considered to be irritating to the skin  based on the results of this in vitro assay.