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EC number: 813-050-0 | CAS number: -
- 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
![](https://echa.europa.eu/o/diss-blank-theme/images/factsheets/A-REACH/factsheet/print_toxicological-information.png)
Genetic toxicity: in vitro
Administrative data
- Endpoint:
- in vitro gene mutation study in bacteria
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2013-05-29 - 2013-09-19
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 013
- Report date:
- 2013
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.13/14 (Mutagenicity - Reverse Mutation Test Using Bacteria)
- Version / remarks:
- Council Regulation No. 440/2008 of 30 May 2008. Official Journal of the European Communities of May 31, 2008, L 142/248 - L142/255. B.13/14. Mutagenicity - Reverse Mutation Test using Bacteria.
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 471 (Bacterial Reverse Mutation Assay)
- Version / remarks:
- OECD Guidelines for Testing of Chemicals No. 471. "Bacterial Reverse Mutation Test". Adopted: 21st July 1997
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 870.5100 - Bacterial Reverse Mutation Test (August 1998)
- Version / remarks:
- Health Effects Test Guidelines; United States Environmental Protection Agency; Prevention, Pesticides and Toxic Substances (7101); EPA712-C-98-247, August 1998. OPPTS 870.5100 -Bacterial Reverse Mutation Test.
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of assay:
- bacterial reverse mutation assay
Test material
- Reference substance name:
- 1,3-diethyl-2,4-diisocyanato-5-methylbenzene
- EC Number:
- 813-050-0
- Cas Number:
- 2162-70-1
- Molecular formula:
- C13H14N2O2
- IUPAC Name:
- 1,3-diethyl-2,4-diisocyanato-5-methylbenzene
- Reference substance name:
- 1,3-diisocyanato-4,6-diethyl-2-methyl-benzene
- Cas Number:
- 93187-13-4
- Molecular formula:
- C13H14N2O2
- IUPAC Name:
- 1,3-diisocyanato-4,6-diethyl-2-methyl-benzene
- Test material form:
- liquid
- Details on test material:
- - Analytical purity: 99.8% of the isomeric mixture
Constituent 1
impurity 1
- Specific details on test material used for the study:
- SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: Sponsor
STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: at room temperature, light protected
- Solubility and stability of the test substance in the solvent/vehicle: stable for al least 24 hours at room temperature, only used at the same day within the time range of stability data
The batch used was analytically examined prior to study initiation and was approved for use for the test period. A stability test in the solvent did not reveal significant degradation of the active ingredient
Method
- Target gene:
- his-
Species / strain
- Species / strain / cell type:
- S. typhimurium TA 1535, TA 1537, TA 98, TA 100 and TA 102
- Details on mammalian cell type (if applicable):
- CELLS USED
- Source of cells: The original strains were obtained from Prof. Bruce Ames (Berkeley, CA, USA).
- Suitability of cells: Histidinc-deficient mutants of Salmonella typhimurium LT2 served as indicators to demonstrate point mutagenic effects. These strains were selected specifically for the Salmonella/ microsome test. Since point mutations can be divided into two basic classes, base-pair substitutions and frameshift mutations, several strains were used which cover both types.
These included the strains Salmonella typhimurium TA1535, TA1537, TA100, TA98 and TA102 (Gatehouse etal. (1994), Levin et al. (1982)). TA 1535 and TA100 bear the base-pair substitution, his G 46, and TA100 additionally contains the plasmid pKM 101. This R factor also contained in TA98 and TA102, codes for an ampicillin resistance and should raise the sensitivity of the strains' TA102 carries the ochre mutation his G 428 on the multicopy plasmid pAQl, which codes in addition for tetracycline resistance. TA1537 and TA98 bear frameshift markers. TA1537 exhibits the +1 mutant, his C 3076, while TA98 bears the +2 type, his D 3052.
Furthermore, the strains have other properties, which should increase their sensitivity. They arc all deep rough, i.e. partly deficient in lipopolysaccharide side chains in their cell walls, enabling larger molecules to penetrate the bacterial cell wall and produce mutations. With the exception of TA102, all strains have reduced capability to repair DNA-damage which increases the likelihood that such damage results in mutations.
- Metabolic activation:
- with and without
- Metabolic activation system:
- Aroclor 1254-induced male Sprague Dawley rat liver S9
- Test concentrations with justification for top dose:
- 0, 10, 25, 50, 160, 500, 1600, 5000 µg/plate
The highest dose tested should cause toxicity or should correspond to the substance's precipitation range (visible precipitates on the plates ) but should not exceed 5 mg/plate or 5 µL/plate, at least six doses were routinely used. - Vehicle / solvent:
- - Vehicle(s)/solvent(s) used: EDGE, 1,2-Dimethoxyethane
- Justification for choice of solvent/vehicle: A stability test in the solvent did not reveal significant degradation of the active ingredient.
Controls
- Untreated negative controls:
- yes
- Remarks:
- solvent control
- Negative solvent / vehicle controls:
- yes
- Remarks:
- EDGE
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- 2-nitrofluorene
- sodium azide
- cumene hydroperoxide
- mitomycin C
- other: 4-Nitro-1,2-phenylene diamine (4-NPDA); 2-Aminoanthracene (2-AA)
- Remarks:
- Sodium azide, mitomycin C and cumene hydroperoxide were dissolved in phosphate buffer. The other positive controls were dissolved in DMSO.
- Details on test system and experimental conditions:
- METHOD OF APPLICATION: in agar (plate incorporation) and preincubation
DURATION
- Preincubation period: 1h (preincubation method)
- Exposure duration: 48 hours (TA102) or 72 hours (TA1535, TA100, TA1537, TA98)
SELECTION AGENT (mutation assays): his minimal agar
NUMBER OF REPLICATIONS: All plates were prepared in triplicate, two independent experiments were performed
DETERMINATION OF CYTOTOXICITY
- Method: relative total growth
- Any supplementary information relevant to cytotoxicity: The toxicity of the substance was assessed by a gross appraisal of background growth on the plates for mutant determination. Moreover, a toxic effect of the substance was assumed when there was a marked and dose-dependent reduction in the mutant count per plate, compared to the solvent controls. - Rationale for test conditions:
- as set out in the guideline
- Evaluation criteria:
- Assessment Criteria
A reproducible and dose-related increase in mutant counts of at least one strain is considered to be a positive result. For TA1535, TA 100, TA1537 and TA98 this increase should be about twice that of solvent controls. For TA102 an increase of about 100 mutants should be reached. Otherwise, the result is evaluated as negative. However, these criteria may be overruled by good scientific judgment.
In case of questionable results, investigations should continue, possibly with modifications, until a final evaluation is possible.
Results and discussion
Test resultsopen allclose all
- Key result
- Species / strain:
- S. typhimurium TA 1535
- Metabolic activation:
- with and without
- Genotoxicity:
- negative
- Cytotoxicity / choice of top concentrations:
- cytotoxicity
- Vehicle controls validity:
- valid
- Untreated negative controls validity:
- not applicable
- Positive controls validity:
- valid
- Key result
- Species / strain:
- S. typhimurium TA 100
- Metabolic activation:
- with and without
- Genotoxicity:
- negative
- Cytotoxicity / choice of top concentrations:
- cytotoxicity
- Vehicle controls validity:
- valid
- Untreated negative controls validity:
- not applicable
- Positive controls validity:
- valid
- Key result
- Species / strain:
- S. typhimurium TA 1537
- Metabolic activation:
- with and without
- Genotoxicity:
- negative
- Cytotoxicity / choice of top concentrations:
- cytotoxicity
- Vehicle controls validity:
- valid
- Untreated negative controls validity:
- not applicable
- Positive controls validity:
- valid
- Key result
- Species / strain:
- S. typhimurium TA 98
- Metabolic activation:
- with and without
- Genotoxicity:
- negative
- Cytotoxicity / choice of top concentrations:
- cytotoxicity
- Vehicle controls validity:
- valid
- Untreated negative controls validity:
- not applicable
- Positive controls validity:
- valid
- Key result
- Species / strain:
- S. typhimurium TA 102
- Metabolic activation:
- with and without
- Genotoxicity:
- negative
- Cytotoxicity / choice of top concentrations:
- cytotoxicity
- Vehicle controls validity:
- valid
- Untreated negative controls validity:
- not applicable
- Positive controls validity:
- valid
- Additional information on results:
- TEST-SPECIFIC CONFOUNDING FACTORS
- Precipitation: none in the plate incorporation; started at 5000 µg/plate in the preincubation test
ADDITIONAL INFORMATION ON CYTOTOXICITY:
Cytotoxicity was observed, but plates were assessable up to higher ranges (see tables) - Remarks on result:
- other: negative for gene mutation in both plate incorporation and preincubation test
Applicant's summary and conclusion
- Conclusions:
- The study was performed scientifically reasonably according to OECD TG 471 under GLP and is well documented. Positive and negative controls gave the appropriate response. Hence, the results can be considered as sufficiently reliable to assess the mutagenic potential of the test item in bacteria. Under the experimental conditions reported (direct plate incorporation procedure and preincubation modification) the test item did not induce gene mutations by base-pair changes or frame-shifts in the genome of the S. typhimurium strains used, when tested up to a maximum recommended dose of 5000 µg/plate in the absence and presence of S9 mix. Hence, the test item does not need to be considered as mutagenic in bacteria.
- Executive summary:
Diethyltolyldiisocyanat, was initially investigated for point mutagenic effects in the plate incorporation test. The test item, dissolved in EGDE, was administered in doses of up to and including 5000 µg per plate without and with S9 mix on the five Salmonella typhimurium LT2 mutant strains TA1535, TA100, TA1537, TA98 and TA102, according to the OECD guideline 471 under GLP. Doses up to and including 0.05 mg per plate did not cause any bacteriotoxic effects. At higher doses, the substance had a strain-specific bacteriotoxic effect, however, ranges up to 5000 µg per plate could be used for assessment purposes. Substance precipitation did not occur.
The test item was investigated in an independent repeat using the preincubation modification. Other experimental conditions remained unchanged. Doses up to and including 0.05 mg per plate did not cause any bacteriotoxic effects. At higher doses, the substance had a strain-specific bacteriotoxic effect. This range could be used up to 5000 µg per plate for assessment purposes. Substance precipitation occurred at the dose of 5000 µg per plate.
In both experiments, the employed positive controls had a marked mutagenic effect, as was seen by a biologically relevant increase in mutant colonics compared to the corresponding solvent controls.
Evidence of mutagenic activity of the test item was not seen. No biologically relevant increase in the mutant count, in comparison to the solvent controls, was observed in any of the strains tested, without and with S9 mix, in the plate incorporation as well in the preincubation modification, under the experimental conditions applied.
Therefore, the test item was considered to be non-mutagenic without and with S9 mix in the plate incorporation as well as in the preincubation modification of the Salmonella/microsome test.
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