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Diss Factsheets
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EC number: 201-484-8 | CAS number: 83-53-4
- 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
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Skin sensitisation
Administrative data
- Endpoint:
- skin sensitisation: in vitro
- Remarks:
- Keratinosens
- 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:
- 2 018
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 442D (In Vitro Skin Sensitisation: ARE-Nrf2 Luciferase Test Method)
- Deviations:
- no
- GLP compliance:
- yes
- Type of study:
- activation of keratinocytes
- Justification for non-LLNA method:
- Alternative in vitro methods are recommended in first intention by ECHA.
Test material
- Reference substance name:
- 1,4-dibromonaphthalene
- EC Number:
- 201-484-8
- EC Name:
- 1,4-dibromonaphthalene
- Cas Number:
- 83-53-4
- Molecular formula:
- C10H6Br2
- IUPAC Name:
- 1,4-dibromonaphthalene
Constituent 1
In vitro test system
- Details on the study design:
- 1. Cell seeding
The cells were trypsinized according to the current working instruction IL 09. Cells suspension were adjusted to a density of 8.104 cells/ml in seeding medium.
125 µl of the cell suspension at 8.104 cells/ml (i.e. 104 cells per well) were distributed in three white plates for the induction measurement and two transparent plates to assess the cytotoxicity. The seeded plates were incubated 24 hours ± 1 hour at 37°C, 5% CO2.
Note: the H12 wells were left without cells and allowed the measurement of blanks.
2. Preparation of test item and positive control dilutions
Preparation of the test item stock solution:
The test item was diluted in DMSO. The stock solution was prepared at 200 mM. A volume of DMSO was calculated according to the following formula: V=(5*[(p/100)*w)/MW) - (w/1000)
where V is the volume of DMSO in ml to be added, p is the purity of the test item in %, MW is the molecular weight of the test item in g/mol, w is the exact weight of the test item in mg.
Preparation of the positive control stock solution:
The positive control stock solution was prepared at 200 mM in DMSO according to the formula above then diluted to 6.4 mM.
Preparation of the 100 X plate:
A 100-fold concentrated dilutions series was prepared in 96-well plate.
Test item
The test item was placed in one of the rows B to F.
100 µl of DMSO were distributed from columns 1 to 11. 200 µl of the 200 mM stock solution were placed in column 12 then the series dilutions were prepared by transferring 100 µl of the column 12 in the column 11 and so on until the column 1. Dilutions were mixed by repeated pipetting, at least 3 times, between each concentration.
Positive control
100 µl of DMSO were distributed in row G from columns 7 to 10. 200 µl of the 6.4 mM stock solution were placed in column 11 then the series dilutions were prepared by transferring 100 µl of the column 11 in the column 10 and so on until the column 7. Dilutions were mixed by repeated pipetting, at least 3 times, between each concentration.
Negative control
100 µl of DMSO were distributed in row G columns 1 to 6 and 12 and in the well H12.
Preparation of the 4 X dilution plate:
The 100 X DMSO plate was diluted 25 fold in a new plate (4 X).
3. Contact between the cells and the test and reference items
In the 5 seeded plates, the medium was aspirated and replaced with 150 µl of treatment medium. Then the 4 X plate was replicated 5 times: 50 µl from the 4 X plate were placed in each of the three white plates and in the two transparent plates. The plates (1 X) were covered with an adhesive plastic foil to prevent evaporation and incubated for 48 hours ± 1 hour (37°C, 5% CO2).
4. Luciferase activity
After 48 hours, the medium was aspirated and each well was gently washed once with 200 µl of PBS. Then 100 µl of luciferase substrate (luciferine + ATP + lysing agent) were then added in each well. The plates were incubated at least 15 minutes at room temperature to ensure cells lysis.
The plates were placed in the luminometer then the luciferase activity was measured with an integration time of 2 seconds.
5. Cell viability assessment with MTT method
After 48 hours, the medium was aspirated and each well was gently washed once with 200 µl of PBS. Then, 225 µl of staining solution diluted at 0.6 mg/ml in treatment medium (from the 5 mg/ml stock solution) were distributed in each well. The plates were covered with an adhesive plastic foil and incubated for 4 hours ± 30 minutes (37°C, 5% CO2).
After this contact time, the staining solution was eliminated and the cells were treated with 200 µl of 10% SDS a week-end (repetition 1) or one night (repetition 2) in the dark (37°C, 5% CO2). After a 10 minutes homogenization, the absorbances were measured at 540 nm.
Results and discussion
In vitro / in chemico
Results
- Key result
- Parameter:
- other: EC1.5 (uM)
- Remarks on result:
- not measured/tested
- Remarks:
- Given that Imax was less than 1.5, the EC1.5 could not be determined
Any other information on results incl. tables
Imax = 1.21 (1st assay) and Imax = 1.13 (2nd assay). Therefore, the mean Imax was 1.17, which is lower than 1.5. No EC1.5 was thus determined.
Applicant's summary and conclusion
- Interpretation of results:
- GHS criteria not met
- Conclusions:
- Under the retained experimental conditions 1,4-DIBROMONAPHTHALENE may be classified as not skin sensitizer.
The test method KeratinoSensTM is considered scientifically valid to be used as part of an integrated approaches to testing and assessment, to support the identification of the sensitization potential of test item for hazard classification and labeling purposes.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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