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EC number: 202-181-3 | CAS number: 92-71-7
- 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 cell study: DNA damage and/or repair
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- Not specified
- Reliability:
- 3 (not reliable)
- Rationale for reliability incl. deficiencies:
- significant methodological deficiencies
Data source
Reference
- Reference Type:
- publication
- Title:
- Gentoxic and radioprotective properties of 2,5-Diphenyloxazole derivatives on mouse DNA structure
- Author:
- Zhizhina et al
- Year:
- 2 005
- Bibliographic source:
- Russian Academy of Sciences, Radiation Biology Radioecology, 45(1), 56-62
Materials and methods
Test guideline
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- The study was primarily conducted on Balb/c female mice. each control or experimental group consisted of 8-10 animals. The mice were exposed to a 12 cGy X-ray in a RUM-17 X-ray unit (210 kV voltage, 15 mA current) with a dose rate of 44 cGy/min. To study the genotoxic properties of the compounds, they were administered intraperitoneally to the animals in one of four concentrations 30 minutes prior to sacrificing the animals and removing the spleen. To study the radioprotective properties of the compounds, they were administered to the animals in the same doses 30 minutes prior to a 12cGy irradiation dose, and the mice were sacrificed and the spleen removed 60 min after irradiation. Measurement of the DNA characteristics was therefore regarded as corresponding to 30 and 90 min after administration of the compounds.Since all the compounds are hydrophobic, they were administered as a suspension in a mixture: Tween 80 – acetone-water = 0.3 : 1.0 : 8.7.
DNA was extracted from the spleen by the Marmur method and enzymatically purified from RNA and protein impurities by incubation with RNAase (100 μg/ml) 60 min and pronase E (150 μg/ml) 90 min at 37°C.. Final RNA and protein impurity content did not exceed 1-2%.
Standard conditions were used for 0.7% agarose gel electrophoresis in a neutral buffer. The gels, stained with ethidium bromide (0.5 μg/ml, Serva), were photographed in ultraviolet light. - GLP compliance:
- not specified
- Type of assay:
- mammalian comet assay
Test material
- Reference substance name:
- 2,5-diphenyloxazole
- EC Number:
- 202-181-3
- EC Name:
- 2,5-diphenyloxazole
- Cas Number:
- 92-71-7
- Molecular formula:
- C15H11NO
- IUPAC Name:
- 2,5-diphenyl-1,3-oxazole
- Test material form:
- solid: crystalline
- Details on test material:
- Expiry date:01 February 2021
Storage conditions: Room temperature in the dark
Batch 21-16131
1
Test animals
- Species:
- mouse
- Strain:
- Balb/c
- Sex:
- female
Administration / exposure
- Route of administration:
- intraperitoneal
- Vehicle:
- Tween 80 – acetone-water = 0.3 : 1.0 : 8.7.
- Duration of treatment / exposure:
- Administered intraperitoneally to the animals in one of four concentrations (Table 1) 30 minutes prior to sacrificing the animals and removing the spleen.
- Frequency of treatment:
- Single exposure.
- Post exposure period:
- 30 minutes and 90 minutes.
Doses / concentrationsopen allclose all
- Dose / conc.:
- 1 mg/kg bw/day
- Dose / conc.:
- 10 mg/kg bw/day
- Dose / conc.:
- 30 mg/kg bw/day
- Dose / conc.:
- 60 mg/kg bw/day
- No. of animals per sex per dose:
- 8 - 10 animals/dose.
- Control animals:
- yes
Examinations
- Tissues and cell types examined:
- Spleen cells.
Results and discussion
Test results
- Key result
- Sex:
- female
- Genotoxicity:
- positive
- Toxicity:
- not examined
- Vehicle controls validity:
- valid
- Negative controls validity:
- not specified
- Positive controls validity:
- not specified
- Additional information on results:
- The substance affected the structural characteristics of mouse spleen DNA. The dose-dependence of these characteristics was nonlinear (often extreme).
Any other information on results incl. tables
Dose (mg/kg bw) | Number of double strand breaks |
0 | 0.03±0.02 |
1 | 0.40±0.05 |
10 | 0.54±0.06 |
30 | 0.45±0.04 |
60 | 0.90±0.09 |
Applicant's summary and conclusion
- Conclusions:
- The substance has been shown to cause DNA double strand breaks and DNA damage (as evidenced by binding of DNA to nitrocellulose membrane) in mice administered intraperitoneal doses of 1, 10, 30 and 60 mg/kg bw/day. Therefore, the substance is expected to be a genotoxin.
- Executive summary:
The substance was administered as a single dose of 1, 10, 30 or 60 mg/kg bw/day to mice via intraperitoneal injection. The animals were sacrificed 30 minutes post-exposure and the spleen was removed for examination. DNA extracted from the spleen was run on agarose gel under electrophoresis to assess DNA strand breaks. To evaluate the conformational state of DNA the solutions were filtered through nitrocellulose filters to provide inforamtion about the extent of DNA damage caused by the substance. The substance affected the structural characteristics of mouse spleen DNA in a dose-dependent manner, however the dose-dependency was non-linear. The substance was shown to cause DNA double strand breaks at all doses administered. Therefore, the substance is expected to be a genotoxin.
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