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Diss Factsheets
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EC number: 617-969-6 | CAS number: 87135-01-1
- 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
- Study period:
- 2009-12-30 - 2010-01-19
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: The study was conducted according to an appropriate EU test method, and in compliance with GLP.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 010
- Report date:
- 2010
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 474 (Mammalian Erythrocyte Micronucleus Test)
- GLP compliance:
- yes
- Type of assay:
- micronucleus assay
Test material
- Reference substance name:
- Reference substance 001
- Cas Number:
- 87135-01-1
- Molecular formula:
- C12H30O6Si2
- Reference substance name:
- 3,3,10,10-tetramethoxy-2,11-dioxa-3,10-disiladodecane
- EC Number:
- 617-969-6
- Cas Number:
- 87135-01-1
- Molecular formula:
- (CH3O)3Si(CH2)6Si(OCH3)3 C12 H30 O6 Si2
- IUPAC Name:
- 3,3,10,10-tetramethoxy-2,11-dioxa-3,10-disiladodecane
- Test material form:
- other: liquid
Constituent 1
Constituent 2
Test animals
- Species:
- rat
- Strain:
- Sprague-Dawley
- Sex:
- male
- Details on test animals or test system and environmental conditions:
- TEST ANIMALS
- Age at study initiation: 6 - 8 weeks old
- Weight at study initiation: 195.0 - 212.1 g
- Assigned to test groups randomly: [no/yes, under following basis: ] yes
- Fasting period before study: no
- Housing: five per Micro-Barrier cage
- Diet (e.g. ad libitum): ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: 5 days
ENVIRONMENTAL CONDITIONS
- Temperature (°C): 72 ± 3ºF
- Humidity (%): 50 ± 20%
- Air changes (per hr): 10 changes of fresh HEPA-filtered air every hour
- Photoperiod (hrs dark / hrs light): 12 hour light/dark cycle
Administration / exposure
- Route of administration:
- oral: gavage
- Vehicle:
- - Vehicle(s)/solvent(s) used: corn oil
- Justification for choice of solvent/vehicle: none given
- Concentration of test material in vehicle: 215, 250 and 500 mg/ml
- Amount of vehicle (if gavage or dermal): 4 ml/kg
- Purity: no information - Details on exposure:
- PREPARATION OF DOSING SOLUTIONS:
Appropriate amount of test substance was weighed into separate containers for each concentration. Vehicle (approximately 80% of final volume) was added, and the formulation vortexed briefly and stirred (magnetic stirrer) for approximately 10 minutes. Remaining volume of vehicle added and stirred for a further 10 minutes. Formulations appeared as yellow solutions.
The route of administration was chosen based on bioavailability data indicating that the substance is well absorbed on oral administration. - Duration of treatment / exposure:
- 24 and 48 hours
- Frequency of treatment:
- Test compound and vehicle control were administered once by oral gavage, positive control was administered by intraperitoneal injection.
- Post exposure period:
- The positive control group was sacrificed 24 hours after administration of the test substance. The vehicle control and test substance groups, except the low and mid dose group which were sacrificed at 24 hours only, were sacrificed 24 and 48 hours after administration of the test substance.
Doses / concentrations
- Remarks:
- Doses / Concentrations:
500, 1000 and 2000 mg/kg bw
Basis:
nominal conc.
- No. of animals per sex per dose:
- Five
- Control animals:
- yes, concurrent vehicle
- Positive control(s):
- - cyclophosphamide (CP)
- Justification for choice of positive control(s): Accuracy of preparation and stability of the CP formulation was demonstrated by the acceptable results that met the criteria for a valid test.
- Route of administration: intraperitoneal injection
- Doses / concentrations: 40 mg/kg
Examinations
- Tissues and cell types examined:
- 2000 Polychromatic erythrocytes (PCEs) per each animal were scored for the presence of micronuclei. The number of normochromatic erythrocytes (NCE's) and micronucleated NCE'S (MNCEs) in the field of 1000 total erythrocytes (ECs) is determined for each animal in order to determine the proportion of polychromatic erythrocytes to total erythrocytes (PCE/EC ratio).
- Details of tissue and slide preparation:
- CRITERIA FOR DOSE SELECTION: limit dose based on toxicity data generated by study Sponsor.
TREATMENT AND SAMPLING TIMES ( in addition to information in specific fields):
DETAILS OF SLIDE PREPARATION: Following centrifugation of bone marrow cells and having drawn off the supernatant, the cells were re-suspended in a small amount of serum and spread onto a clean glass slide. Two slides per animal were air dried and fixed with methanol. Slides were stained with a nucleic acid-specific stain, acridine orange.
METHOD OF ANALYSIS: Following randomised coding, a fluorescent microscope and medium magnification (400X; blue excitation filter in the range of 440-490 nm and barrier filter combination at 520 nm) was used to score cells that were well spread and stained.
OTHER: - Evaluation criteria:
- The test substance would have been considered to induce a positive response if a dose-responsive increase in the incidence of micronucleated polychromatic erythrocytes was observed and one or more doses were statistically elevated relative to the vehicle control at any sampling times.
- Statistics:
- Kastenbaum-Bowman Tables
Results and discussion
Test results
- Sex:
- male
- Genotoxicity:
- negative
- Toxicity:
- no effects
- Vehicle controls validity:
- valid
- Negative controls validity:
- not applicable
- Positive controls validity:
- valid
Any other information on results incl. tables
Summary of bone marrow micronucleus assay
Treatment (4 ml/kg) |
Time (hr) |
Number of animals |
Mean PCE/total erythrocytes |
Change from control (%) |
% mean MPCE |
Number of MPCE/PCE scored |
Solvent control |
24 |
5 |
0.530 |
- |
0.03 |
3 |
500 |
24 |
5 |
0.562 |
6 |
0.04 |
4 |
1000 |
24 |
5 |
0.539 |
2 |
0.02 |
2 |
2000 |
24 |
5 |
0.570 |
8 |
0.05 |
5 |
Positive control |
24 |
5 |
0.435 |
-18 |
1.49 |
149 |
Solvent control |
48 |
5 |
0.499 |
- |
0.05 |
5 |
2000 |
48 |
5 |
0.503 |
1 |
0.06 |
6 |
Applicant's summary and conclusion
- Conclusions:
- Interpretation of results (migrated information): negative
1,6-Bis(trimethoxysilyl)hexane has been tested in an in vivo rat micronucleus assay which was conducted according to OECD 474 and in compliance with GLP. No evidence of test substance related induction of micronuclei was observed following administration of the test substance by oral gavage at doses of 500, 1000 and 2000 mg/kg bw. No reduction in the ratio of PCEs to total erythrocytes was observed. Appropriate vehicle and positive controls were included and gave expected results. It is concluded that the test substance is not clastogenic under the conditions of the test.
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