Diesters of alcohols, C7-9-iso-, C8-rich, 2-ethylhexyl and nonanedioic acid

Endpoint summary

Description of key information

Diesters of alcohols, C7-9-iso-, C8-rich, 2-ethylhexyl and nonanedioic acid was tested for skin irritation in the EpiDermTM model according to OECD 439. 30 uL of the substance, positive control (5% SDS) and negative control (PBS) was applied to the tissue for 60 minutes (25 minutes at room temperature and 35 minutes at 37°C, 5% CO2) and thereafter tissues were incubated for 42 hour post-dose at 37°C, 5% CO2. The substance did not interfere by colour or by direct MTT reduction. Tissue viability was 92.3% of negative controls, while validity criteria were evaluated to be met. The substance is concluded to be non-irritant (XcellR8, 2017).

Diesters of alcohols, C7-9-iso-, C8-rich, 2-ethylhexyl and nonanedioic acid was tested for eye irritation in the EpiOcular TM  Eye Irritation model according to OECD 492. 50 uL of the substance, positive control (methyl acetate) and negative control (H2O) was applied to the tissue for 30 minutes, followed by a 12 minutes post-treatment immersion at 37°C, 5% CO2 and thereafter tissues were incubated for 2 hour post-dose at 37°C, 5% CO2. The substance did not interfere by colour or by direct MTT reduction. Tissue viability was 94.1% of negative controls, while validity criteria were met. The substance is concluded to be non-irritant (XcellR8, 2017).

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Endpoint:

skin irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

04 April 2017 to 28 April 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

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

GLP compliance:

yes (incl. QA statement)

Test system:

human skin model

Source species:

human

Cell type:

other: reconstructed human skin

Cell source:

other: EpiDerm TM (EPI-200-MatTek Corporation)

Vehicle:

unchanged (no vehicle)

Details on test system:

RECONSTRUCTED HUMAN EPIDERMIS (RHE) TISSUE
- Model used: EpiDerm TM (EPI-200-MatTek Corporation)
- Tissue batch number(s): Lot# 25809
- Delivery date: 25 April 2017
- Date of initiation of testing: no data

TEMPERATURE USED FOR TEST SYSTEM
- Temperature used during treatment / exposure: 60 minutes (25 minutes at room temperature and 35 minutes at 37°C, 5% CO2)
- Temperature of post-treatment incubation: 42 hour post-dose incubation at 37°C, 5% CO2

REMOVAL OF TEST MATERIAL AND CONTROLS
- Volume and number of washing steps: not indicated (according to MatTEek SOP)

MTT DYE USED TO MEASURE TISSUE VIABILITY AFTER TREATMENT / EXPOSURE: no data (according to MatTEek SOP)
- MTT concentration: not specified
- Incubation time: no data
- Spectrophotometer: not identified measured at 570 nm
- Wavelength: 570 nm
- Filter: none
- Linear OD range of spectrophotometer: no data

FUNCTIONAL MODEL CONDITIONS WITH REFERENCE TO HISTORICAL DATA
- Viability: yes (1.51 ± 0.101 (mean and SD of MTT value of 3 tissues exposed to H2O)
- Barrier function: yes (ET 50% of tissues exposed to 100 µL Triton X-100 1% (n=3): 6.27h)
- Morphology: yes ( Histological examination demonstrates human epidermis-like structure: including multiple layers (at least 4) of viable epithelial cells (basal layer, stratum spinosum, stratum granulosum) which are present under multilayered stratum corneum ; Tissue thickness: 97.3 µm )
- Contamination: No contamination reported
- Reproducibility: yes (The mean OD of the 6 wells containing extraction solvent alone (blanks) should be ≤ 0.1., but was 0.1452 evaluated not to have affected the measurements)

NUMBER OF REPLICATE TISSUES: 3 for negative controls, positive controls and substance treated tissues

Control samples:

yes, concurrent negative control

yes, concurrent positive control

Amount/concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 30 µl

NEGATIVE CONTROL
- Amount(s) applied (volume or weight): 30 µl PBS

POSITIVE CONTROL
- Amount(s) applied (volume or weight): 30 µl SDS
- Concentration (if solution): 5% in water

Duration of treatment / exposure:

60 minutes (25 minutes at room temperature and 35 minutes at 37°C, 5% CO2)

Duration of post-treatment incubation (if applicable):

42 hour post-dose incubation at 37°C, 5% CO2

Number of replicates:

3/treatment

Irritation / corrosion parameter:

% tissue viability

Value:

92.3

Negative controls validity:

valid

Positive controls validity:

valid

Remarks:

mean viability 4.6%

Remarks on result:

no indication of irritation

Other effects / acceptance of results:

No colour interference or interference with MTT reduction as tested in a pre-test

Name (code)	mean of OD	SD of OD	Mean of viability (%)	SD of viability (%)	CV %	Classification
BS (NC)	1.721	0.112	100.0	6.50	6.50	Non-Irritant
DS 5% (PC)	0.080	0.005	4.6	0.31	6.72	Irritant
Substance (TA1)	1.588	0.178	92.3	10.36	11.23	Non-Irritant

 

Interpretation of results:

GHS criteria not met

Conclusions:

The substance is non-irritant in the EpiDermTM model

Executive summary:

The substance was tested for skin irritation in the EpiDermTM model according to OECD 439. 30 uL of the substance, positive control (5% SDS) and negative control (PBS) was applied to the tissue for 60 minutes (25 minutes at room temperature and 35 minutes at 37°C, 5% CO2) and thereafter tissues were incubated for 42 hour post-dose at 37°C, 5% CO2. The substance did not interfere by colour or by direct MTT reduction. Tissue viability was 92.3% of negative controls, while validity criteria were evaluated to be met. The substance is concluded to be non-irritant.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Eye irritation

Link to relevant study records

Reference

Endpoint:

eye irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

04 April 2017 to 27 April 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 492 (Reconstructed Human Cornea-like Epithelium (RhCE) Test Method for Identifying Chemicals Not Requiring Classification and Labelling for Eye Irritation or Serious Eye Damage)

GLP compliance:

yes (incl. QA statement)

Species:

human

Details on test animals or tissues and environmental conditions:

- Tissue :Reconstructed human Cornea-like Epithelium (RhCE)
- Model used: ‘EpiOcularTM irritation test ( MatTek Corporation EpiOcularTM EIT (OCL-200) Reconstituted Human Ocular Epithelium )
- Tissue batch number(s): Lot# 23777
- Delivery date: 25 April 2017
- Date of initiation of testing: no data

TEMPERATURE USED FOR TEST SYSTEM
- Temperature used during treatment / exposure: 30 minutes ± 2 minutes, followed by a 12 ± 2 minutes post-treatment immersion at 37°C, 5% CO2
- Temperature of post-treatment incubation: 2 hours ± 15 minutes’ post-treatment incubation at 37°C, 5% CO2

REMOVAL OF TEST MATERIAL AND CONTROLS
- Volume and number of washing steps: not indicated (according to MatTEek SOP)

MTT DYE USED TO MEASURE TISSUE VIABILITY AFTER TREATMENT / EXPOSURE: no data (according to MatTEek SOP)
- MTT concentration: not specified
- Incubation time: no data
- Spectrophotometer: not identified measured at 570 nm

Vehicle:

unchanged (no vehicle)

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 50 µl

Duration of treatment / exposure:

30 minutes ± 2 minutes, followed by a 12 ± 2 minutes’ post-treatment immersion at 37°C, 5% CO2

Number of animals or in vitro replicates:

3 replicates

Details on study design:

tisues were wetted with 20 uL PBS before application of the substance or controls

negative control: sterile H2O
positive control: methyl acetate (neat)

number of replicates: 3

Irritation parameter:

other: viability (%)

Value:

94.1

Negative controls validity:

valid

Remarks:

OD570 1.7

Positive controls validity:

valid

Remarks:

viability 33.3%

Remarks on result:

no indication of irritation

Other effects / acceptance of results:

Acceptance criteria passed

Acceptance criterion 1 The mean OD570 of the negative control(treated with PBS) tissues is > 0.8 and < 2.8
 
Acceptance criterion 2 The mean of the positive control relative percentage viability must be below 50% of the mean of the negative controls.
 
Acceptance criterion 3 The standard deviationof OD values between three replicates in each experimental condition must be ≤ 18%
 

Name (Code)	mean of OD	SD of OD	Mean of viability(%)	SD of viability (%)	CV %	Classification
Sterile wate (NC)	1.705	0.012	100.000	0.71	0.706	Non-Irritant
Methyl Acetate (PC)	0.569	0.091	33.343	5.310	15.924	Irritant
Substance (TA1)	1.605	0.158	94.135	9.255	9.832	Non-Irritant

Interpretation of results:

GHS criteria not met

Conclusions:

The substance is not irritant when tested in the EpiOcular TM Eye Irritation Test

Executive summary:

The substance was tested for eye irritation in the EpiOcular TM  Eye Irritation model according to OECD 492. 50 uL of the substance, positive control (methyl acetate) and negative control (H2O) was applied to the tissue for 30 minutes, followed by a 12 minutes post-treatment immersion at 37°C, 5% CO2 and thereafter tissues were incubated for 2 hour post-dose at 37°C, 5% CO2. 

The substance did not interfere by colour or by direct MTT reduction. Tissue viability was 94.1% of negative controls, while validity criteria were met. The substance is concluded to be non-irritant.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Justification for classification or non-classification

Based on the outcome of in vitro tests for skin and eye irritation diesters of alcohols, C7-9-iso-, C8-rich, 2-ethylhexyl and nonanedioic acid does not need to be classified for irritation according to EC No 1272/2008.