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EC number: 227-876-9 | CAS number: 6021-61-0
- 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 vivo
Administrative data
- Endpoint:
- in vivo mammalian somatic cell study: cytogenicity / bone marrow chromosome aberration
- Type of information:
- experimental study
- Remarks:
- source of read-across
- Adequacy of study:
- key study
- Study period:
- From December 09th, 1997 to January 07th, 1998
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Cross-reference
- Reason / purpose for cross-reference:
- read-across source
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 998
- Report date:
- 1998
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 474 (Mammalian Erythrocyte Micronucleus Test)
- Version / remarks:
- adopted May 26, 1983
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.12 (Mutagenicity - In Vivo Mammalian Erythrocyte Micronucleus Test)
- GLP compliance:
- yes (incl. QA statement)
- Type of assay:
- mammalian erythrocyte micronucleus test
Test material
- Reference substance name:
- Similar Substance 02
- IUPAC Name:
- Similar Substance 02
Constituent 1
Test animals
- Species:
- mouse
- Strain:
- NMRI
- Sex:
- male/female
- Details on test animals or test system and environmental conditions:
- TEST ANIMALS
- Source: BRL, CH-4414 Füllinsdorf.
- Age at the acclimatization: 8-12 weeks.
- Weight at study initiation: males mean value 28.8 g (SD ± 2.6 g); females mean value 25.9 g (SD ± 1.8 g).
- Assigned to test groups randomly: yes.
- Fasting period before study: approximately 18 hours before treatment the animals received no food but water ad libitum.
- Housing: single, in Makrolon Type I, with wire mesh top.
- Diet: pelleted standard diet, ad libitum.
- Water: tap water, ad libitum.
- Acclimation period: minimum 5 days.
- Quarantine: the animals were under quarantine in the animal house of testing facility for a minimum of five days after their arrival. During this period the animals did not show any signs of illness or altered behaviour.
ENVIRONMENTAL CONDITIONS
- Temperature: 21 ± 3 °C
- Humidity: 24 - 70 %
- Photoperiod: artificial light 6.00 a.m. - 6.00 p.m.
Administration / exposure
- Route of administration:
- oral: gavage
- Vehicle:
- - Solvent: on the day of the experiment, the test article was formulated in PEG 400.
- Justification for choice of solvent: the vehicle was chosen due to its relative non-toxicity for the animals. - Details on exposure:
- All animals received a single standard volume of 10 ml/kg body weight orally.
Pre-experiment for toxicity
A preliminary study on acute toxicity was performed with a small group of animals under identical conditions as in the mutagenicity study concerning: animal strain; vehicle; route, frequency, and volume of administration.
The animals were treated orally with the test article and examined for acute toxic symptoms at intervals of 1 h, 6 h, 24 h, and 48 h after administration of the test article. - Frequency of treatment:
- Once and twice at an interval of 24 hours
Doses / concentrationsopen allclose all
- Dose / conc.:
- 200 mg/kg bw/day (actual dose received)
- Remarks:
- at 24 hours
- Dose / conc.:
- 670 mg/kg bw/day (actual dose received)
- Remarks:
- at 24 hours
- Dose / conc.:
- 2 000 mg/kg bw/day (actual dose received)
- Remarks:
- at 24 and48 hours
- No. of animals per sex per dose:
- Six males and six females were assigned to each test group.
- Control animals:
- yes, concurrent vehicle
- Positive control(s):
- - Positive control: cyclophosphamide.
Examinations
- Tissues and cell types examined:
- Polychromatic erythrocytes (PCE) in the bone marrow.
- Details of tissue and slide preparation:
- Sampling of the bone marrow was done 24 and 48 hours after treatment, respectively.
Preparation of the animals
The animals were sacrificed by cervical dislocation. The femora were removed, the epiphyses were cut off and the marrow was flushed out with fetal calf serum, using a syringe. The cell suspension was centrifuged at 1500 rpm (390 x×g) for 10 minutes and the supernatant was discarded. A small drop of the resuspended cell pellet was spread on a slide. The smear was air-dried and then stained with May-Griinwald. Cover slips were mounted with EUKITT. At least one slide was made from each bone marrow sample.
Analysis of cells
Evaluation of the slides was performed using NIKON microscopes with 100x oil immersion objectives. At least 2000 polychromatic erythrocytes (PCE) were analysed per animal for micronuclei. To describe a cytotoxic effect the ratio between polychromatic and normochromatic erythrocytes was determined in the same sample and expressed in normochromatic erythrocytes per 2000 the PCEs. The analysis was performed with coded slides.
Five animals per sex and group were evaluated as described. - Evaluation criteria:
- A test article is classified as mutagenic if it induces either a dose-related increase in the number of micronucleated polychromatic erythrocytes or a statistically significant positive response for at least one of the test points.
A test article producing neither a dose-related increase in the number of micronucleated polychromatic erythrocytes nor a statistically significant positive response at any of the test points is considered non-mutagenic in this system.
This can be confirmed by means of the nonparametric Mann-Whitney test.
However, both biological and statistical significance should be considered together.
Results and discussion
Test results
- Sex:
- male/female
- Genotoxicity:
- negative
- Toxicity:
- yes
- Remarks:
- slight toxic reactions
- Vehicle controls validity:
- valid
- Negative controls validity:
- valid
- Positive controls validity:
- valid
- Additional information on results:
- The animals expressed slight toxic reactions.
The mean number of normochromatic erythrocytes was increased after treatment with the test article as compared to the mean value of NCEs of the vehicle controls, indicating that test item had cytotoxic properties in the bone marrow.
In comparison to the corresponding vehicle controls there was no statistically significant or biologically relevant enhancement in the frequency of the detected micronuclei at any preparation interval and dose level after administration of the test article. The mean values of micronuclei observed after treatment with test item were close to the vehicle control value.
POSITIVE CONTROL
40 mg/kg b.w. cyclophosphamide administered per os was used as positive control which showed a statistically significant increase of induced micronucleus frequency.
Applicant's summary and conclusion
- Conclusions:
- The substance is considered to be non-mutagenic in the micronucleus assay.
- Executive summary:
The study was performed to investigate the potential of test item to induce micronuclei in polychromatic erythrocytes (PCE) in the bone marrow of the mouse. The test article was formulated in polyethylene glycol 400 (PEG 400). PEG 400 was used as vehicle control. The volume administered orally (gavage) was 10 ml/kg b.w.. 24 h and 48 h after a single administration of the test article the bone marrow cells were collected for micronuclei analysis. Ten animals (5 males, 5 females) per test group were evaluated for the occurrence of micronuclei. At least 2000 polychromatic erythrocytes (PCE) per animal were scored for micronuclei.
To describe a cytotoxic effect due to the treatment with the test article the ratio between polychromatic and normochromatic erythrocytes (NCE) was determined in the same sample and reported as the number of NCE per 2000 PCE.
The following dose levels of the test article were investigated: at 24 h preparation interval 200, 670 and 2000 mg/kg b.w.; at 48 h preparation interval 2000 mg/kg b.w..
The highest guideline-recommended dose (2000 mg/kg) was estimated by a pre-experiment to be suitable. The animals expressed slight toxic reactions. After treatment with the test article the mean number of NCEs was increased as compared to the corresponding vehicle controls thus indicating that test item had cytotoxic effectiveness.
In comparison to the corresponding vehicle controls there was no statistically significant or biologically relevant enhancement in the frequency of the detected micronuclei at any preparation interval after administration of the test article and with any dose level used.
40 mg/kg b.w. cyclophosphamide administered per os was used as positive control which showed a statistically significant increase of induced micronucleus frequency.
Conclusion
In conclusion, it can be stated that during the study described and under the experimental conditions reported, the test article did not induce micronuclei as determined by the micronucleus test with bone marrow cells of the mouse.
Therefore, the substance is considered to be non-mutagenic in the micronucleus assay.
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