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EC number: 249-320-4 | CAS number: 28940-11-6
- 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
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:
- From November 22 to December 13, 2007
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 008
- Report date:
- 2008
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 471 (Bacterial Reverse Mutation Assay)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.13/14 (Mutagenicity - Reverse Mutation Test Using Bacteria)
- Deviations:
- no
- Principles of method if other than guideline:
- Not applicable
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- UK GLP Compliance Programme (inspected on August 21, 2007/ signed on October 15, 2007)
- Type of assay:
- bacterial reverse mutation assay
Test material
- Reference substance name:
- 7-methyl-2H-benzo-1,5-dioxepin-3(4H)-one
- EC Number:
- 249-320-4
- EC Name:
- 7-methyl-2H-benzo-1,5-dioxepin-3(4H)-one
- Cas Number:
- 28940-11-6
- Molecular formula:
- C10H10O3
- IUPAC Name:
- 7-methyl-3,4-dihydro-2H-1,5-benzodioxepin-3-one
- Test material form:
- solid: crystalline
- Details on test material:
- - Physical state: White crystalline solid
- Storage condition of test material: Approximately 4 ºC in the dark under nitrogen
Constituent 1
Method
- Target gene:
- Histidine and tryptophan gene
Species / strain
- Species / strain / cell type:
- S. typhimurium TA 1535, TA 1537, TA 98, TA 100 and E. coli WP2
- Additional strain / cell type characteristics:
- other: TA 100, TA1535 and E Coli WP2 sensitive to agents inducing base pair mutation. TA1537 and TA98 sensitive to agents inducing frame-shift mutations.
- Metabolic activation:
- with and without
- Metabolic activation system:
- 10 % S9 mix; S9 from liver of male Sprague- Dawley rats orally received three consecutive daily doses of phenobarbitone/β-naphthoflavone (80/100 mg/kg bw/day prior to S9 preparation on Day 4
- Test concentrations with justification for top dose:
- Preliminary toxicity study: 0.15, 0.5, 1.5, 5, 15, 50, 150, 500, 1500 and 5000 µg/plate in TA 100 and WP2 uvr A strains, with or without S9-mix using the direct plate incorporation method.
Mutation Test (direct plate incorporation method):
Experiment 1 (Range-finding Test)
Salmonella strains and E.coli strain WP2uvrA- (with and without S9): 50, 150, 500, 1500 and 5000 μg/plate, with or without S9-mix. (up to maximum recommended concentration).
Experiment 2 (Main Test)
Salmonella strains and E.coli strain WP2uvrA- (with and without S9): 50, 150, 500, 1500 and 5000 μg/plate, with or without S9-mix. (up to maximum recommended concentration). - Vehicle / solvent:
- - Vehicle(s)/solvent(s) used: Dimethyl sulphoxide (DMSO)
- Justification for choice of solvent/vehicle: Test material was insoluble in sterile distilled water at 50 mg/mL , but was fully soluble in DMSO at 50 mg/mL. Therefore, DMSO was selected as vehicle.
- Preparation of test materials: The test material was accurately weighed and approximate half-log dilutions prepared in dimethyl sulphoxide by mixing on a vortex mixer and sonication for 10 minutes at 40 °C on the day of each experiment. Prior to use, the solvent was dried using molecular sieves (sodium alumino-silicate) ie 2 mm pellets with a nominal pore diameter of 4 x 10-4 microns.
Controlsopen allclose all
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous mutation rates
- Negative solvent / vehicle controls:
- yes
- Remarks:
- DMSO
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- 4-nitroquinoline-N-oxide
- 9-aminoacridine
- N-ethyl-N-nitro-N-nitrosoguanidine
- Remarks:
- Without S9-mix
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous mutation rates
- Negative solvent / vehicle controls:
- yes
- Remarks:
- DMSO
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- benzo(a)pyrene
- other: 2-Aminoanthracene
- Remarks:
- With S9-mix
- Details on test system and experimental conditions:
- SOURCE OF TEST SYSTEM: Salmonella typhimurium strains were obtained from the University of California at Berkeley whilst Escherichia coli strain WP2uvrA- was obtained from the British Industrial Biological Research Association.
METHOD OF APPLICATION: in agar (plate incorporation)
DURATION
- Exposure duration: Approximately 48 h at 37 °C
NUMBER OF REPLICATIONS:
- Preliminary toxicity study: One plate/dose
- Mutation study: 3 plates/dose
DETERMINATION OF CYTOTOXICITY
- Method: Evaluation of the toxicity was performed on the basis of growth of the bacterial background lawn. - Rationale for test conditions:
- Experiment 1 & 2: tested up to 5000 μg/plate (maximum recommended concentration)
- Evaluation criteria:
- - There are several criteria for determining a positive result, such as a dose-related increase in revertant frequency over the dose range tested and/or a reproducible increase at one or more concentrations in at least one bacterial strain with or without metabolic activation. Biological relevance of the results will be considered first, statistical methods, as recommended by the UKEMS (Kirkland, 1989) can also be used as an aid to evaluation, however, statistical significance will not be the only determining factor for a positive response.
- A test material will be considered non-mutagenic (negative) in the test system if the above criteria are not met.
- Although most experiments will give clear positive or negative results, in some instances the data generated will prohibit a definitive judgement about the test material activity. Results of this type will be reported as equivocal. - Statistics:
- Statistical analysis recommended by UKEMS (Kirkland, 1989)
Results and discussion
Test results
- Key result
- Species / strain:
- S. typhimurium TA 1535, TA 1537, TA 98, TA 100 and E. coli WP2
- Metabolic activation:
- with and without
- Genotoxicity:
- negative
- Cytotoxicity / choice of top concentrations:
- no cytotoxicity
- Vehicle controls validity:
- valid
- Untreated negative controls validity:
- not applicable
- Positive controls validity:
- valid
- Additional information on results:
- TEST-SPECIFIC CONFOUNDING FACTORS
- Effects of pH: Not applicable
- Effects of osmolality: Not applicable
- Evaporation from medium: Not expected
- Water solubility: Not soluble in water
- Precipitation: None
- Other confounding effects: None
PRELIMINARY TOXICITY STUDY:
The test material was non-toxic to the strains TA 100 and WP2uvrA-.
COMPARISON WITH HISTORICAL CONTROL DATA:
All tester strain cultures exhibit a characteristic number of spontaneous revertants per plate in the untreated controls.
ADDITIONAL INFORMATION ON CYTOTOXICITY:
- The test material caused no visible reduction in the growth of the bacterial background lawn at any dose level.
OTHERS:
- Prior to use, the master strains were checked for characteristics, viability and spontaneous reversion rate and found to be satisfactory.
- Test material formulation, amino acid supplemented top agar and the S9 mix used in the experiments were shown to be sterile.
Any other information on results incl. tables
Table 7.6.1/2: Preliminary Toxicity Test
S9 mix |
Strain |
Dose (µg/plate) |
||||||||||
0 |
0.15 |
0.5 |
1.5 |
5 |
15 |
50 |
150 |
500 |
1500 |
5000 |
||
- S9 |
TA 100 |
114 |
91 |
95 |
110 |
113 |
100 |
102 |
99 |
110 |
84 |
73 |
+ S9 |
TA 100 |
76 |
69 |
82 |
85 |
68 |
76 |
80 |
81 |
73 |
78 |
62 |
- S9 |
WP2 uvr A |
26 |
26 |
18 |
15 |
35 |
27 |
37 |
18 |
13 |
23 |
18 |
+ S9 |
WP2 uvr A |
30 |
36 |
26 |
36 |
36 |
34 |
32 |
38 |
33 |
42 |
15 |
See the attached document for information on tables of results – mutagenicity test
Applicant's summary and conclusion
- Conclusions:
- Under the test conditions, the test material is not mutagenic with and without metabolic activation in S. typhimurium (strains TA 1535, TA 1537, TA 98 and TA 100) and E. coli WP2 uvr A.
- Executive summary:
In a reverse gene mutation assay performed according to the OECD test guideline No. 471 and in compliance with GLP, strains of Salmonella typhimurium (TA 1535, TA 1537, TA 98 and TA 100) and Escherichia coli WP2 uvr A were exposed to the test material diluted in DMSO using the plate incorporation method. The dose range for the range-finding test was determined in a preliminary toxicity assay and was 50 to 5000 µg/plate. The experiment was repeated on a separate day using the same dose range as the range-finding test, fresh cultures of the bacterial strains and fresh test material formulations. Negative, vehicle (DMSO) and positive control groups were also included in mutagenicity tests.
The vehicle control plates gave counts of revertant colonies within the normal range. All of the positive control chemicals used in the test induced marked increases in the frequency of revertant colonies, both with or without metabolic activation. Thus, the sensitivity of the assay and the efficacy of the S9-mix were validated. The test material caused no visible reduction in the growth of the bacterial background lawn at any dose level. The test material was tested up to the maximum recommended dose level of 5000 μg/plate. No test material precipitate was observed on the plates at any of the doses tested in either the presence or absence of S9-mix. No significant increases in the frequency of revertant colonies were recorded for any of the bacterial strains, at any dose level either with or without metabolic activation.
Under the test condition, the test material is not classified as mutagenic with and without metabolic activation to S. typhimurium (TA 1535, TA 1537, TA 98 and TA 100) and E. coli WP2 uvr A according to the criteria of the Annex VI of the Regulation (EC) No. 1272/2008 (CLP) and to the GHS.
This study is considered as acceptable and satisfies the requirement for reverse gene mutation endpoint.
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