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EC number: 305-586-4 | CAS number: 94733-07-0 A complex combination of hydrocarbons obtained by distillation of residual oils from the cracking of petroleum or natural gas. It consists of hydrocarbons having carbon numbers predominantly in the range of C9 through C10 and boiling in the range of 150°C to 210°C (302°F to 410°F).
- 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 vivo
Administrative data
- Endpoint:
- in vivo mammalian somatic cell study: cytogenicity / erythrocyte micronucleus
- Remarks:
- Type of genotoxicity: chromosome aberration
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: GLP, guideline study available as unpublished report, no restrictions, fully adequate for assessment.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 004
- Report date:
- 2004
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 474 (Mammalian Erythrocyte Micronucleus Test)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 870.5395 (In Vivo Mammalian Cytogenetics Tests: Erythrocyte Micronucleus Assay)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.12 (Mutagenicity - In Vivo Mammalian Erythrocyte Micronucleus Test)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of assay:
- micronucleus assay
Test material
- Reference substance name:
- 68478-10-4
- Cas Number:
- 68478-10-4
- IUPAC Name:
- 68478-10-4
- Reference substance name:
- Dicyclopentadiene/Codimer Concentrate (DCPD/Codimer Concentrate)
- IUPAC Name:
- Dicyclopentadiene/Codimer Concentrate (DCPD/Codimer Concentrate)
- Details on test material:
- - Name of test material (as cited in study report): Dicyclopentadiene/Codimer Concentrate
- Synonyms: DCPD/Codimer Concentrate, DCP97, H-25430
- CA Index name: Naphtha (petroleum), light steam-cracked, debenzenized, C8-16-cycloalkadiene concentrate
- Lot number: 121302
- Substance type: a distillate from a C8+ fraction of thermally processed pyrolysis gasoline obtained from ethylene production
- Physical state: colourless liquid
- Purity: Not applicable (The test substance was within specifications and the occurrence and distribution of isomers was as expected).
- Stability under test conditions: stable at room temperature below 70°F, protected from light and air
- Composition of test material, percentage of components:
29.175 wt % endo- and exo-DCPD
18.726 wt % C4-MCPD and C5-MCPD codimers
13.210 wt % MCPD dimer
12.903 wt % CPD-MCPD codimer
8.129 wt % C8 aliphatic and aromatic hydrocarbons
7.144 wt % C4-CPD and C5-CPD codimers
3.625 wt % MCPD-C7 dimer
2.771 wt % Tetrahydroindene
1.917 wt % Trimers
0.927 wt % C7 cyclic hydrocarbon
0.697 wt % C5 acyclic hydrocarbon dimer
0.634 wt % MCPD monomer
0.078 wt % CPD monomer
0.063 wt % C6 acyclic hydrocarbons
Constituent 1
Constituent 2
Test animals
- Species:
- mouse
- Strain:
- other: Crl:CD-1®(ICR)BR
- Sex:
- male/female
- Details on test animals or test system and environmental conditions:
- - Source: Charles River Breeding Laboratories, Raleigh, North Carolina, USA (males); Charles River Canada, St. Constant, Canada (females)
- Age at study initiation: approximately 8 weeks
- Weight at study initiation: approximately 28.7-35.6 g (males), 21.6-26.8 g (females)
- Assigned to test groups randomly: yes (by computerised stratified randomisation)
- Fasting period before study: No
- Housing: 3 same sex per cage in stainless steel, wire-mesh suspended cages.
- Diet: Certified Rodent LabDiet® 5002 (PMI Nutrition International, Inc.,) ad libitum
- Water: tap water ad libitum
- Acclimation period: 6 days
ENVIRONMENTAL CONDITIONS
- Temperature: 22 ± 3ºC
- Humidity: 30-70%
- Air changes (per hr): Not reported
- Photoperiod: 12hrs dark / 12hrs light
IN-LIFE DATES: Not reported
Administration / exposure
- Route of administration:
- oral: gavage
- Vehicle:
- - Vehicle(s)/solvent(s) used: corn oil
- Details on exposure:
- PREPARATION OF DOSING SOLUTIONS: The dosing solutions were prepared daily in corn oil. A correction factor was not used for preparation of the dosing solutions. Prior to dosing, aliquots were taken from each DCPD/Codimer Concentrate dosing preparation, and the homogeneity/concentration and stability of the vehicle control, high, intermediate, and low test substance dosing preparations were confirmed.
- Duration of treatment / exposure:
- 2 days
- Frequency of treatment:
- At approximately 24-hour interval
- Post exposure period:
- 24 hours
Doses / concentrations
- Remarks:
- Doses / Concentrations:
0, 437.5, 875, or 1750 mg/kg body weight
Basis:
other: nominal in corn oil
- No. of animals per sex per dose:
- 5/sex/group (0, 437.5, or 875 mg/kg body weight and positive controls), 7/sex/group (1750 mg/kg body weight).
- Control animals:
- yes, concurrent vehicle
- Positive control(s):
- 5/sex (cyclophosphamide, 30 mg/kg once by oral intubation)
Examinations
- Tissues and cell types examined:
- bone marrow erythrocytes
- Details of tissue and slide preparation:
- The mice were sacrificed approximately 24 hours after administration of the second dose and smears of bone marrow erythrocytes were prepared and stained.
- Evaluation criteria:
- 2000 PCEs per animal were scored for the presence of micronuclei. The proportion of PCEs among 1000 total erythrocytes was determined for each animal, and expressed as the PCE/NCE ratio.
- Statistics:
- Total polychromatic erythrocytes (PCEs), micronucleated polychromatic erythrocytes, normochromatic erythrocytes (NCEs) were compared to the
control using Dunnett’s and Dunn’s test (p < 0.05).
Results and discussion
Test results
- Key result
- Sex:
- male/female
- Genotoxicity:
- negative
- Toxicity:
- yes
- Remarks:
- Clinical signs and decreased body weights at 1750 mg/kg
- Vehicle controls validity:
- valid
- Positive controls validity:
- valid
Any other information on results incl. tables
An 18% and 14% decrease in terminal body weight was observed for the high dose males and females, respectively, as compared with their initial body weights. The terminal body weight loss for the high dose groups, as compared with the controls, was 18% for males and 13% for females. Both observed body weight reductions are considered test substance-related signs of systemic toxicity. The body weight loss in males is also considered biologically significant.
No statistically significant or biologically relevant effects on micronuclei frequencies were observed in the bone marrow cells in any dose group treated with DCPD/Codimer Concentrate. Although not statistically significant, a depression of approximately 30% in the PCE/NCE ratio was seen at 1750 mg/kg in females and demonstrates exposure of target cells to the test substance.
The vehicle and positive control groups exhibited a response consistent with the laboratory’s historical control data. The positive control, cyclophosphamide, induced a significant increase in the frequency of micronucleated PCEs (p < 0.05).
Applicant's summary and conclusion
- Conclusions:
- Interpretation of results: negative
DCPD/Codimer Concentrate gave a negative response in this mouse micronucleus assay. - Executive summary:
DCPD/Codimer Concentrate was evaluated for its ability to induce micronuclei in bone marrow polychromatic erythrocytes (PCEs) in male and female mice using groups of 5-7 mice/sex. Animals received 2 doses at 24 hour intervals and were assessed 24 hours after the second dose.
DCPD/Codimer Concentrate did not induce a statistically significant increase in micronucleated polychromatic erythrocytes in male or female mouse bone marrow. The highest dose administered on the study (1750 mg/kg body weight) gave clear evidence of clinical signs (both sexes) and exposure of the bone marrow to the substance (decreased PCE/NCE ratio) in females.
Based on these findings, DCPD/Codimer Concentrate (CAS 68478-10-4) was considered negative in this in vivo assay.
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