Amines, C10-14-branched and linear alkyl, bis[2-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]benzoato(2-)]chromate(1-)

Eye irritation

Administrative data

Endpoint:

eye irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

08 Mar 2016 to 03 Aug 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2016

Report date:

2016

Materials and methods

Test guideline

Test guideline 1

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)

Version / remarks:

28 July 2015

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU method B.47 (Bovine corneal opacity and permeability test method for identifying ocular corrosives and severe irritants)

Version / remarks:

8 December 2010

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

Amines, C10-14-branched and linear alkyl, bis[2-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]benzoato(2-)]chromate(1-)

EC Number:

285-083-3

EC Name:

Amines, C10-14-branched and linear alkyl, bis[2-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]benzoato(2-)]chromate(1-)

Cas Number:

85029-58-9

Molecular formula:

C34H24CrN8O6.C10-14H21-29NH2

IUPAC Name:

reaction mass of: branched and linear(C10-C14)ammonium , bis[2-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]benzoato(2-)]chromate(1-)

Details on test material:

The substance was formerly identified as: 73297-13-9 / 615-953-3 / Chromate(1-), bis[2-[2-[4,5-dihydro-3-methyl-5-(oxo-κO)-1-phenyl-1H-pyrazol-4-yl]diazenyl-κN1]benzoato(2-)-κO]-, hydrogen, compd. with 1-tridecanamine (1:1:1)

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
- Name of test substance: Orasol Yellow 157
- Test-substance No.: 16/0017-1
- Source and lot/batch No. of test material: 003-142715
- Purity test date: c 98 area-% (LC)
- Content: 98.4 g/100 g

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Homogeneity: The test substance was homogeneous by visual inspection.
- Storage condition of test material: Room temperature
- Solubility and stability of the test substance in the solvent/vehicle: no vehicle
- Reactivity of the test substance with the solvent/vehicle of the cell culture medium: no reactivity

OTHER SPECIFICS:
- pH: Ca. 5
- Physical state / color: Solid / brown

Test animals / tissue source

Species:

human

Strain:

other: EpiOcularTM model (OCL-200)

Details on test animals or tissues and environmental conditions:

- EpiOcularTM model (OCL-200): A three-dimensional non-keratinized tissue construct composed of normal human derived epidermal keratinocytes used to model the human corneal epithelium
- Cell course: All cells used to produce EpiOcularTM are purchased or derived from tissue obtained by MatTek Corporation from accredited institutions.In all cases consent was obtained by these institutions from the donor or the donor's legal next of kin, for the use of the tissues or derivatives of the tissue for research purposes.
- Tissue model: OCL-200
- Tissue Lot Number: 23700 (Certificate of Analysis see appendix)
- Supplier: MatTek In Vitro Life Science Laboratories, Bratislava, Slovakia

Test system

Vehicle:

unchanged (no vehicle)

Controls:

yes, concurrent positive control

yes, concurrent negative control

Amount / concentration applied:

- Amount of test item: 50 µL
- Amount of positive control: 50 µL
- Amount of negative control: 50 µL

Duration of treatment / exposure:

Total exposure time: 6 h

Duration of post- treatment incubation (in vitro):

Postincubation period: 18 h

Number of animals or in vitro replicates:

2 tissue replicates for a single test is sufficient. In case of borderline results a second test is performed. In case of discordant test results between the 2 tests, a third is performed.

Details on study design:

MATERIAL AND TECHNICAL EQUIPMENT
- Laminar flow bench: HERAsafe KS 18 (Thermo ELECTRON CORPORATION)
- CO2 incubator: Heraeus BBD 6220
- Incubation conditions: 37°C ± 1°C, 5% ± 1% CO2, 90% ± 5% humidity
- Spectrophotometer: SunriseTM Absorbance Reader
- Wavelength: 570 nm without reference filter
- Assay medium: OCL-200-ASY
- Detection agent: 3-[4.5-dimethylthiazol-2-yl]-2.5-diphenyltetrazolium bromide (MTT)
- Extracting agent: Isopropanol p.a

TISSUE PREPARATION:
Preincubation: On the day of arrival in the laboratory, the tissues were transferred to sterile 6-well plates with 1 mL assay medium and preconditioned in the incubator at 37°C. After 1 h, the preincubation medium was replaced with fresh medium and preconditioning continued in the incubator at standard culture conditions for 16 – 24 h.
Pretreatment: After the pre-incubation, the tissues were pre-treated with 20 μL of PBS in order to wet the tissue surface. The tissues were incubated at standard culture conditions for 30 minutes.

APPLICATION OF THE TEST ITEM:
Using a sharp spoon, approx. 50 μL of the undiluted test material was applied covering the whole tissue surface. Control tissues were applied with 50 μL of negative and of positive control. After application, the tissues were placed into the incubator until the total exposure time of 6 h.

REMOVAL AND POSTINCUBATION PERIOD:
To remove the test item, the tissues were washed with sterile PBS. Tissues were immersed and swiveled three times in each of three beakers filled with PBS. Washed tissues were immediately immersed into 12-well plates and pre-filled with 5 mL/well prewarmed medium (post-soak immersion) in order to remove residual test substance. After 25 minutes of post-soak immersion, each tissue was dried on absorbent paper and transferred to fresh 6-well plates filled with 1 mL/well pre-warmed medium.
The tissues were incubated at standard culture conditions for 18 hours (postincubation period).

MTT INCUBATION:
After the post-incubation period, the assay medium was replaced by 0.3 mL MTT solution and the tissues were incubated in the incubator for 3 hours. After incubation, the tissues were washed with PBS to stop the MTT-incubation. The formazan that was metabolically produced by the tissues was extracted by incubation of the tissues in isopropanol at room temperature overnight or for at least 2 hours on a plate shaker. The optical density at a wavelength of 570 nm (OD570) of the extracts was determined spectrophotometrically. Blank values were established of 4 microtiter wells filled with isopropanol for each microtiter plate.

EVALUATION CRITERIA:
A chemical is considered as "irritant", if the mean relative tissue viability with a test material is ≤ 60%.
However a borderline range is statistically determined. Therefore, mean percent tissue viability equal to ± 5% of the cut-off value is considered to be discordant.

Results and discussion

In vitro

Results

Results 1

Irritation parameter:

other: tissue viability (%)

Run / experiment:

1

Value:

115.7

Vehicle controls validity:

valid

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

Results 2

Irritation parameter:

other: tissue viability (%)

Run / experiment:

2

Value:

100.7

Vehicle controls validity:

valid

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

Results 3

Irritation parameter:

other: tissue viability (%)

Run / experiment:

mean

Value:

108.2

Vehicle controls validity:

valid

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

Other effects / acceptance of results:

OTHER EFFECTS:
- Visible damage on test system: Yellowish discoloration of the test substance-treated tissues was observed after the washing procedure.

ACCEPTANCE OF RESULTS:
- Acceptance criteria met for negative control: yes
- Acceptance criteria met for positive control: yes

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met