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EC number: 948-046-9 | CAS number: -
- 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
Toxicity to reproduction
Administrative data
- Endpoint:
- screening for reproductive / developmental toxicity
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 08 February 2017 to 10 November 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Cross-reference
- Reason / purpose for cross-reference:
- reference to same study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 017
- Report date:
- 2017
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 422 (Combined Repeated Dose Toxicity Study with the Reproduction / Developmental Toxicity Screening Test)
- Deviations:
- no
- GLP compliance:
- yes
- Limit test:
- no
Test material
- Reference substance name:
- Reaction mass of benzenamine, 2-ethyl-N-(2-ethyl-nonylphenyl) nonyl-, branched and benzenamine, 2-ethyl-N-(2-ethyl-nonylphenyl)-, branched
- Molecular formula:
- Not applicable
- IUPAC Name:
- Reaction mass of benzenamine, 2-ethyl-N-(2-ethyl-nonylphenyl) nonyl-, branched and benzenamine, 2-ethyl-N-(2-ethyl-nonylphenyl)-, branched
- Test material form:
- liquid
- Details on test material:
- CAS number: Not yet known
EC Number: Not yet known
Constituent 1
- Specific details on test material used for the study:
- Physical Description: Dark brown, clear liquid
Purity: 91%
Test animals
- Species:
- rat
- Strain:
- other: Crl:CD(SD)
- Sex:
- male/female
Administration / exposure
- Route of administration:
- oral: gavage
- Vehicle:
- corn oil
- Details on exposure:
- The test substance formulations were prepared approximately weekly as single formulations for each dosage level, divided into aliquots in corn oil for daily dispensation, and stored refrigerated (2°C to 8°C), protected from light. The test substance formulations were stirred continuously throughout the preparation, sampling, and dose administration procedures.
- Details on mating procedure:
- Males and females were paired on a 1:1 basis within each treatment group following 14 days of treatment and were cohabitated in a solid-bottom cage containing bedding material until positive evidence of mating was confirmed by the presence of a vaginal copulatory plug or the presence of sperm following vaginal lavage. Each mating pair was examined daily. The day when evidence of mating was identified was termed Gestation Day 0 and the animals were separated.
- Analytical verification of doses or concentrations:
- yes
- Details on analytical verification of doses or concentrations:
- Test material formulations prepared at concentrations of 20, 60, and 200 mg/mL were analyzed by a validated high performance liquid chromatography method using ultraviolet absorbance detection at a wavelength of 260 nm. The analytical results met the applicable protocol-specified acceptance criteria. No test substance was detected in the analyzed vehicle administered to the control group.
- Duration of treatment / exposure:
- Males were dosed throughout the mating period through 1 day prior to euthanasia for a total of 28 doses.
Females received 14 daily doses prior to pairing and were dosed through Lactation Day 13 for a total of 49–53 doses. - Frequency of treatment:
- Once daily
- Details on study schedule:
- Time of Necropsy
- F0 males: After final investigations completed (after at least five weeks of treatment).
- F0 females failing to produce a viable litter: Day 25 after mating.
- F0 females: Day 14 of lactation (following terminal blood sampling)
Doses / concentrationsopen allclose all
- Dose / conc.:
- 0 mg/kg bw/day (nominal)
- Dose / conc.:
- 100 mg/kg bw/day (nominal)
- Dose / conc.:
- 300 mg/kg bw/day (nominal)
- Dose / conc.:
- 1 000 mg/kg bw/day (nominal)
- No. of animals per sex per dose:
- 10
- Control animals:
- yes, concurrent vehicle
- Details on study design:
- The dose selection was based upon a range-finding study (please see RSS section 7.5.1 Supporting study, Charles River, 2017 (range-finding)).
Examinations
- Parental animals: Observations and examinations:
- Detailed observations were performed to establish and confirm a pattern of signs in association with dosing according to the following schedule:
F0 Males
Weeks 1-3: Twice daily
Last week of dosing (Study Day 26): 5 males/group only
F0 Females
Weeks 1-4:Twice daily
Last week of dosing (Lactation Day 13): 5 females/group only
Lactation Day 14
Detailed observations were recorded at the following times in relation to dose administration: Approximately 1.5 hours after dosing - Oestrous cyclicity (parental animals):
- Vaginal lavages were performed daily and evaluated microscopically to determine the stage of the estrous cycle of each female for 14 days prior to randomization, continuing until evidence of copulation was observed. The average cycle length was calculated and reported for complete estrous cycles beginning with the first day of dose administration. Vaginal lavages were also performed on the day of necropsy to determine the stage of the estrous cycle.
- Sperm parameters (parental animals):
- The weight of the testis were examined. The testes with epididymides were collected, treated, fixed and stained for microcopic examination.
- Litter observations:
- - On the day parturition was initiated (PND 0), pups were sexed and examined for gross malformations, and the numbers of stillborn and live pups were recorded. Individual gestation length was calculated using the date delivery started.
- Litters were examined daily for survival and any adverse changes in appearance or behavior. Each pup received a clinical examination on PND 1, 4, 7, 10, and 13
- The anogenital distance of all F1 pups was measured on PND 1.
- To reduce variability among the litters, 8 pups/litter, 4 pups/sex when possible, were randomly selected on PND 4. - Postmortem examinations (parental animals):
- Necropsy
All F0 adults were euthanized by carbon dioxide inhalation and were subject to a detailed necropsy. Males were euthanized following completion of the mating period. Females that delivered were euthanized on Lactation Day 14; one vehicle control female that failed to deliver was euthanized on Postcohabitation Day 25.
Macroscopic Examination
A complete necropsy was conducted on all F0 parental animals at the scheduled termination. Blood samples were collected for thyroid hormone analysis immediately prior to euthanasia for males and on Lactation Day 13 for females. Uteri with no macroscopic evidence of implantation were opened and subsequently placed in 10% ammonium sulphide solution for detection of early implantation loss. Necropsy included examination of the external surface, all orifices, the cranial cavity, the external surface of the brain, and the thoracic, abdominal, and pelvic cavities, including viscera.
Organ Weights
The following organs were weighed from all F0 animals at the scheduled necropsies:
Adrenal glands
Brain
Epididymides (paired organs were weighed separately)
Heart
Kidneys
Liver
Ovaries with oviducts
Pituitary gland
Prostate gland
Seminal vesicles (with coagulating gland and fluid)
Spleen
Testes (paired organs were weighed separately)
Thymus gland
Thyroids with parathyroids
Histology and Microscopic Examinations
After fixation, specified tissues were trimmed, processed into paraffin blocks, sectioned, mounted on glass microscope slides, and stained with hematoxylin and eosin. PAS staining was used for the testes and epididymides. Microscopic examination was performed on all tissues from 5 animals/sex in the vehicle control and 1000 mg/kg/day groups at the scheduled necropsies. Gross lesions were examined from all animals in all groups. - Postmortem examinations (offspring):
- Each litter was examined daily for survival, and all deaths were recorded and a daily record of litter size was maintained. Intact offspring that were found dead from PND 0 to 4 were necropsied using a fresh dissection technique, which included examination of the heart and major vessels. Tissues were preserved in 10% neutral-buffered formalin for gross findings.
- Statistics:
- Data obtained from nongravid females were excluded from statistical analyses following the mating period. Where applicable, the litter was used as the experimental unit.
Analyses were conducted using two-tailed tests for minimum significance levels of 1% and 5%, comparing each test substance-treated group to the vehicle control group by sex. Parental mating, fertility, conception, and copulation indices were analyzed using the Chi-square test with Yates’ correction factor. Parental body weights (weekly, gestation, and lactation), body weight changes, and food consumption, offspring body weights and body weight changes, estrous cycle length, precoital intervals, gestation length, numbers of former implantation sites, and unaccounted-for sites, number of pups born, live litter size on PND 0, absolute and relative organ weights, clinical pathology values, thyroid hormone values, anogenital distance (absolute and relative to the cube root of body weight), number of nipples/areolae, and FOB data values were subjected to a parametric one-way ANOVA to determine intergroup differences. If the ANOVA revealed significant (p < 0.05) intergroup variance, Dunnett's test was used to compare the test substance-treated groups to the vehicle control group. FOB parameters that yield scalar or descriptive data in the test substance-treated groups were compared to the vehicle control group using Fisher’s Exact test. Mean litter proportions (percent per litter) of males at birth and postnatal survival were subjected to the Kruskal-Wallis nonparametric ANOVA to determine intergroup differences. If the nonparametric ANOVA revealed significant (p < 0.05) intergroup variance, Dunn’s test was used to compare the test substance-treated groups to the vehicle control group.
Results and discussion
Results: P0 (first parental generation)
General toxicity (P0)
- Clinical signs:
- effects observed, non-treatment-related
- Description (incidence and severity):
- Clinical observations noted in the test substance-treated groups, including red and yellow material on various body surfaces and hair loss on the forelimbs, were noted infrequently, similarly in the vehicle control group, and/or in a manner that was not dose-related.
- Dermal irritation (if dermal study):
- not examined
- Mortality:
- no mortality observed
- Body weight and weight changes:
- no effects observed
- Food consumption and compound intake (if feeding study):
- no effects observed
- Food efficiency:
- not examined
- Water consumption and compound intake (if drinking water study):
- not examined
- Ophthalmological findings:
- not examined
- Haematological findings:
- no effects observed
- Clinical biochemistry findings:
- effects observed, non-treatment-related
- Description (incidence and severity):
- The statistically significant differencse from the vehicle control group were an increased mean potassium level and decreased mean sodium level in the 100 mg/kg/day group F0 males and a lower mean bile acid level in the 300 mg/kg/day group F0 males. There was no dose-response relationship, no similar occurrence in the opposite sex, and/or the changes were of minimal magnitude. These differences from the vehicle control group were considered to be the result of normal biological variation and were not considered to be of toxicological significance.
- Urinalysis findings:
- not examined
- Behaviour (functional findings):
- no effects observed
- Immunological findings:
- not examined
- Organ weight findings including organ / body weight ratios:
- no effects observed
- Histopathological findings: non-neoplastic:
- no effects observed
- Histopathological findings: neoplastic:
- not examined
- Other effects:
- no effects observed
- Description (incidence and severity):
- There were no test substance-related effects on thyroid hormone values in the F0 males at any dosage level. Differences from the vehicle control group were considered to be the result of normal biological variation and were not considered to be of toxicological significance.
Reproductive function / performance (P0)
- Reproductive function: oestrous cycle:
- no effects observed
- Description (incidence and severity):
- The mean lengths of estrous cycles in these groups were also comparable to the vehicle control group value.
- Reproductive function: sperm measures:
- no effects observed
- Reproductive performance:
- no effects observed
- Description (incidence and severity):
- No test substance-related effects on reproductive performance were observed at any dosage level. One male in the vehicle control group did not sire a litter and one female in this group was determined to be nongravid.
Effect levels (P0)
- Key result
- Dose descriptor:
- NOAEL
- Effect level:
- 1 000 mg/kg bw/day (nominal)
- Based on:
- test mat.
- Sex:
- male/female
- Basis for effect level:
- clinical signs
- mortality
- body weight and weight gain
- food consumption and compound intake
- haematology
- clinical biochemistry
- organ weights and organ / body weight ratios
- gross pathology
- histopathology: non-neoplastic
- reproductive function (oestrous cycle)
- reproductive function (sperm measures)
- reproductive performance
Target system / organ toxicity (P0)
- Key result
- Critical effects observed:
- no
Results: F1 generation
Effect levels (F1)
- Remarks on result:
- not measured/tested
Overall reproductive toxicity
- Key result
- Reproductive effects observed:
- not specified
Applicant's summary and conclusion
- Conclusions:
- No adverse effects were noted in F0 adults or F1 pups at any dosage level, therefore, 1000 mg/kg/day was considered to be the no-observed-adverse-effect level (NOAEL) for F0 reproductive and systemic toxicity and F1 neonatal toxicity of the test substance when administered orally by gavage to Crl:CD(SD) rats.
- Executive summary:
The potential toxic effects of the test substance at dosage levels of 100, 300 and 1000 mg/kg bw/day were investigated in an OECD 422 study, performed under GLP conditions. The test substance or vehicle control (corn oil) was administered to rats via gavage once daily to 4 groups of Crl:CD(SD) rats, each group consisting of 10 males and 10 females.
All F0 males and females in the vehicle control, 100, 300, and 1000 mg/kg/day groups survived to the scheduled necropsies. No test substance-related clinical observations were noted for the 100, 300, and 1000 mg/kg/day group F0 males and females during the weekly detailed physical examinations, at the daily examinations, or approximately 1.5 hours following dose administration.
No test substance-related effects were noted on F0 male and female body weights, body weight gains, or food consumption at any dosage level throughout the study. Mean F0 male and female reproductive performance (mating, fertility, and copulation/conception indices) and the process of parturition in the 100, 300, and 1000 mg/kg/day groups were unaffected by test substance administration. The mean number of days between pairing and coitus, gestation length, and estrous cycle length were unaffected by test substance administration. There were no test substance-related effects noted on the mean numbers of former implantation sites and unaccounted-for sites in F0 females at any dosage level. There were no test substance-related effects noted during the FOB or motor activity evaluations for F0 animals at any dosage level.
There were no test substance-related effects on F0 organ weights, hematology and serum chemistry parameters, and serum T4 levels (males only) in the 100, 300, and 1000 mg/kg/day groups. No test substance-related gross necropsy observations or microscopic findings were noted for F0 males and females at any dosage level.
Mean numbers of F1 pups born, live litter size, and percentage of males at birth were unaffected by parental test substance administration. There were no test substance-related effects on postnatal survival and no test substance-related clinical observations were noted for F1 pups at any dosage level. F1 pup body weights and body weight gains in the 100, 300, and 1000 mg/kg/day groups were unaffected by parental test substance administration.
Under the conditions of this screening study, no adverse effects were noted in F0 adults or F1 pups at any dosage level. Therefore, 1000 mg/kg/day was considered to be the no-observed-adverse-effect level (NOAEL) for F0 reproductive and systemic toxicity and F1 neonatal toxicity of the test substance when administered orally by gavage to Crl:CD(SD) rats.
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