Registration Dossier
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Diss Factsheets
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EC number: 202-114-8 | CAS number: 91-99-6
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data

Eye irritation
Administrative data
- Endpoint:
- eye irritation: in vitro / ex vivo
- Remarks:
- in vitro
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2012-11-13 - 2013-01-24
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Referenceopen allclose all
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 013
- Report date:
- 2013
- Reference Type:
- other: amendment
- Title:
- Unnamed
- Year:
- 2 015
- Report date:
- 2015
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- other: MatTek Corporation, Ashland, MA 01721, USA: EpiOcularTM human cell construct: Procedure details, Version 3.1a of February 10, 2010
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- other: Harbell J.W. et al. (2009): COLIPA Program on Optimization of Existing In Vitro Eye Irritation Assays for Entry into Formal Validation: Technology Transfer and Intra/Inter Laboratory Evaluation of EpiOcular Assay for Chemicals.
- Deviations:
- no
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 405 (Acute Eye Irritation / Corrosion)
- Deviations:
- not applicable
- GLP compliance:
- yes (incl. QA statement)
Test material
- Reference substance name:
- Reaction mass of 2,2’-[(4-methylphenyl)imino]bisethanol and Ethanol 2-[[2-(2-hydroxyethoxy)ethyl](4- methylphenyl)amino]-
- IUPAC Name:
- Reaction mass of 2,2’-[(4-methylphenyl)imino]bisethanol and Ethanol 2-[[2-(2-hydroxyethoxy)ethyl](4- methylphenyl)amino]-
- Test material form:
- liquid: viscous
- Details on test material:
- Physical appearance: liquid
Storage conditions: not indicated
Constituent 1
Test animals / tissue source
- Species:
- other: EpiOcular™ OCL-200 kit
- Details on test animals or tissues and environmental conditions:
- TEST SYSTEM
Source: MatTek Corp., Ashland MA, USA
Three dimensional human cornea model
The EpiOcular™ model (OCL-200) is a three-dimensional non-keratinized tissue construct composed of normal human derived epidermal keratinozytes used to model the human corneal epithelium. The EpiOcularTM tissues (surface 0.6 cm²) are cultured on specially prepared cell culture inserts (MILLICELLs, 10 mm ∅) and are commercially available as kits (EpiOcular™ 200), containing 24 tissues on shipping agarose.
Test system
- Vehicle:
- unchanged (no vehicle)
- Controls:
- yes
- Amount / concentration applied:
- TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 50 µL - Duration of treatment / exposure:
- 30 min
- Details on study design:
- EXPERIMENTAL PROCEDURE
Pre-Test
To assess the ability of the test material to directly reduce MTT a pretest was performed as described below. The test substance was added to 0.9 mL of the MTT solution. The mixture was incubated in the dark at about 37 °C for 55 to 65 minutes. A negative control (de-ionized water) was tested concurrently. If the MTT solution color or, in case of water-insoluble test substances the border to the water-phase, turned blue / purple, the test substance was presumed to directly reduce MTT. The direct reduction of MTT by a test substance interferes with the color density produced by metabolic capacity of the tissue and would falsify the test results. In case that direct MTT reduction occurred, two freeze-killed control tissues were treated with, each, the test article and the negative control.
Main Test
Two tissues were treated with the test substance, the PC and NC, respectively. In addition two killed tissues were used for the test substance and NC, respectively, in order to detect direct MTT reduction. There are two separate protocols for liquids and solids, differing in exposure time and postincubation period. Due to the physical condition of the test substance the protocol for liquids was applied.
Pre-incubation of the tissues
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 standard culture conditions for 16 – 24 hours (pre-incubation).
Pretreatment of the tissues
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 substance
Using a pipette, fifty microliter (50 μL) of the undiluted liquid test substance was applied covering the whole tissue surface. Control tissues were concurrently applied with 50 μL of sterile de-ionized water (NC) or with 50 μL of methyl acetate (PC) or test substance (killed tissue control, KC). After application, the tissues were placed into the incubator until the total exposure time of 30 minutes was completed.
Removal of the test substance and postincubation period
To remove the test substance, the tissues were washed with sterile PBS. For this purpose the tissues were immersed and swiveled three times in each of three beakers filled with PBS. Washed tissues were immediately immersed into 12-well plates, pre-filled with 5 mL/well prewarmed medium (post-soak immersion) in order to remove residual test substance. After 12 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. Subsequently, the tissues were incubated at standard culture conditions for 2 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.
DATA EVALUATION
Principle
The OD570 values determined for the various tissues are measures of their viability. The quotient of the OD570 of tissues treated with the test material and the mean OD570 values of the NC (percent of control) is used for evaluating whether or not a test material is an irritant.
Calculation of individual and mean optical densities
The individual tissue OD570 is calculated by subtracting the mean blank value of the respective microtiter plate from the respective individual tissue OD570 value. The mean OD570 for a test group of two tissues treated in the same way is calculated.
Application of measurements using killed control tissues
In case of direct reduction of MTT by the test substance, the OD570 values measured in the freeze-killed control tissues (KC) will be used to correct the mean OD570 of the test substance treated tissues (mean OD570 KC corrected). Since killed tissue might still have a residual enzyme activity that is able to produce some formazan net OD570 KC is calculated by subtracting the mean OD570 KC of the NC from the mean OD570 KC of the test substance. In case the mean net OD570 KC is greater than 0.1 it is subtracted from the respective mean OD570 to result in the mean OD570 KC corrected. The mean OD570 KC corrected represents the formazan production linked to the tissue viability and therefore indicates the cytotoxic potency of the test substance.
Tissue viability
The quantification of tissue viability is presented as the quotient of the mean OD570 (or mean OD570 KC corrected, if applicable) divided by the respective OD570 NC value in percent.
ACCEPTANCE CRITERIA
Assay acceptance criterion for the NC
The absolute OD570 of the NC-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. Tissue viability is acceptable if the mean OD570 of the NC is ≥ 1.0. The mean OD570 of the NC should not exceed 2.5.
Acceptance criteria for the PC
Methyl acetate used as PC usually leads to a tissue viability of approx. 25%. A viability of < 50% is acceptable.
Assay acceptance criterion for tissue variability
Two tissues were treated under the same conditions. A variability between the tissues is considered to be acceptable if the difference of the viability is ≤ 20%.
Acceptance criteria for the KC
The OD570 of the killed control tissues treated as negative control should be ≤ 0.35. The value for direct MTT-reduction of a test substance should be ≤ 30% of the NC.
EVALUATION OF RESULTS
The irritation potential of the test materials is predicted from the mean relative tissue viabilities compared to the negative control tissues concurrently treated with sterile water. A chemical is considered as "irritant", if the mean relative tissue viability with a test material is less than or equal to 50%. At present no prediction is performed if the mean relative tissue viability with a test material is > 50 ≤ 60% as the cut off value is currently being evaluated to lie in this range.
Results and discussion
In vitro
Results
- Irritation parameter:
- other: Mean tissue viability (%)
- Value:
- 10
- Vehicle controls validity:
- not applicable
- Negative controls validity:
- valid
- Remarks:
- 100% (OD570: 1.856)
- Positive controls validity:
- valid
- Remarks:
- 29% (OD570: 0.534)
- Remarks on result:
- other: OD570: 0.187
- Other effects / acceptance of results:
- Based on the observed results and applying the evaluation criteria cited in chapter 3.8 it was concluded, that Diethanol-para-toluidine shows an eye irritation potential in the EpiOcular™ eye irritation test under the test conditions chosen.
Applicant's summary and conclusion
- Interpretation of results:
- study cannot be used for classification
- Conclusions:
- In a GLP-compliant EpiOcular test, the test substance Accelerator produced a positive response (mean tissue viability 10%). As EpiOcular test does not allow distinguishing between Category 1 and Category 2 eye irritants, the results of the study cannot be used for classification purposes.
- Executive summary:
In a GLP-compliant EpiOcular test, the test substance Accelerator produced a positive response. The mean tissue viability, measured as a mean of two tissues, was 10%. The acceptability criteria were met, and the positive and negative controls produced satisfactory response, confirming the sensitivity of the assay. As EpiOcular test does not allow distinguishing between Category 1 and Category 2 eye irritants, the results of the study cannot be used for classification purposes.
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