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EC number: 701-388-0 | 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
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- 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:
- 28 October 2013 to 22 May 2014
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 014
- Report date:
- 2014
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 421 (Reproduction / Developmental Toxicity Screening Test)
- Deviations:
- yes
- Remarks:
- The right kidney of one female was identified to have an increased pelvic space, but tissue was not retained for histopathological examination.
- GLP compliance:
- yes
- Limit test:
- no
Test material
- Reference substance name:
- 1,3-bis(2-hydroxyethyl)-5,5-dimethylimidazolidine-2,4-dione
- EC Number:
- 701-388-0
- Cas Number:
- 26850-24-8
- IUPAC Name:
- 1,3-bis(2-hydroxyethyl)-5,5-dimethylimidazolidine-2,4-dione
- Test material form:
- other: pale yellow solid block
- Details on test material:
- - Name of test material (as cited in study report): Dantocol DHE
- Physical state: pale yellow solid block
- Lot/batch No.: M5469330
- Storage condition of test material: room temperature in the dark
Constituent 1
- Specific details on test material used for the study:
- Identification : Dantocol (CAS # 26850-24-8)
Description : Yellow very viscous liquid
Chemical Name : Di-(2-Hydroxyethyl)-5, 5-Dimethylhydantoin
Purity : 99%
Batch Number : M9416741
Label : DANTOCOL (R) DHE Lot No M9416741
Date Received : 05 August 2013
Storage Conditions : Room temperature in the dark
Expiry Date : 22 February 2014
No correction for purity was made.
Test animals
- Species:
- rat
- Strain:
- Wistar
- Details on species / strain selection:
- Wistar Han™:RccHan™:WIST
- Sex:
- male/female
- Details on test animals or test system and environmental conditions:
- The animals were allowed free access to food and water.
The animals were housed in a single air-conditioned room within the laboratories. The rate of air exchange was at least fifteen air changes per hour and the low intensity fluorescent lighting was controlled to give twelve hours continuous light and twelve hours darkness. Environmental conditions were continuously monitored by a computerized system, and print-outs of hourly temperatures and humidities are included in the study records. The Study Plan target ranges for temperature and relative humidity were 22 ± 3 °C and 30 ± 70% respectively; Short term fluctuations from these targets were considered not to have affected the purpose or integrity of the study.
Administration / exposure
- Route of administration:
- oral: gavage
- Vehicle:
- water
- Details on exposure:
- The test item was administered by gavage to three groups, each of twelve male and twelve female Wistar Han™:RccHan™:WIST strain rats, for up to eight weeks (including a two week pre-pairing phase, pairing, gestation and early lactation for females), at dose levels of 30, 300 and 1000 mg/kg bw/day. A control group of twelve males and twelve females was dosed with vehicle alone (Distilled water).
- Analytical verification of doses or concentrations:
- yes
- Details on analytical verification of doses or concentrations:
- Samples of the test item formulation were taken and analyzed for concentration of Dantocol (CAS # 26850-24-8) at Harlan Laboratories Ltd., Shardlow, UK, Analytical Services.
- Duration of treatment / exposure:
- Eight weeks (including a two week pre-pairing phase, pairing, gestation and early lactation for females). Pairing of animals within each dose group was undertaken on a one male: one female basis within each treatment group on Day 15 of the study, with females subsequently being allowed to litter and rear their offspring to Day 5 of lactation. During the lactation phase, daily clinical observations were performed on all surviving offspring, together with litter size and offspring weights and assessment of surface righting reflex. Adult males were terminated on Day 43, and females with litters were sent to necropsy on Day 5 post partum. Female 93 given 1000 mg/kg bw/day which did not achieve pregnancy was terminated on Day 25 post coitum. All animals were subjected to a gross necropsy examination and histopathological evaluation of reproductive tissues was performed.
- Frequency of treatment:
- Daily
Doses / concentrationsopen allclose all
- Dose / conc.:
- 0 mg/kg bw/day (nominal)
- Dose / conc.:
- 30 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:
- Twelve/sex/dose
- Control animals:
- yes, concurrent vehicle
- Positive control:
- No
Examinations
- Parental animals: Observations and examinations:
- Clinical signs, body weight change, dietary intake and water consumption were monitored during the study. Mating, fertility and gestation length were monitored to evaluate the reproductive performance of the parental animals.
- Litter observations:
- For each litter the following was recorded:
i. Number of offspring born
ii. Number of offspring alive recorded daily and reported on Days 1 and 4 post partum
iii. Sex of offspring on Days 1 and 4 post partum
iv. Clinical condition of offspring from birth to Day 5 post partum
v. Individual offspring weights on Days 1 and 4 post partum (litter weights were calculated retrospectively from this data) - Postmortem examinations (parental animals):
- For all females, the uterus was examined for signs of implantation and the number of uterine implantations in each horn was recorded. All adult animals including those dying during the study, were subjected to a full external and internal examination, and any macroscopic abnormalities were recorded. Organ weights and histopathology of the following were undertaken:
Coagulating gland
Prostate
Epididymides
Seminal vesicles
Ovaries
Testes
Mammary gland (females only)
Uterus/Cervix
Pituitary
Vagina - Postmortem examinations (offspring):
- All offspring were subjected to a full external and internal examination, and any macroscopic abnormalities were recorded.
- Statistics:
- Where considered appropriate, quantitative data was subjected to statistical analysis to detect the significance of intergroup differences from control; statistical significance was achieved at a level of p<0.05. The homogeneity of variance from mean values was analyzed using Bartlett’s test. Intergroup variance were assessed using suitable ANOVA, or if required, ANCOVA with appropriate covarities. Any transformed data were analyzed to find the lowest treatment level that showed a significant effect using the Williams Test for parametric data or the Shirley Test for nonparametric data. If no dose response was found but the data shows non-homogeneity of means, the data were analyzed by a stepwise Dunnett’s (parametric) or Steel (non-parametric) test to determine significant difference from the control group. Where the data were unsuitable for these analyses, pair-wise tests was performed using the Student t-test (parametric) or the Mann-
Whitney U test (non-parametric). - Reproductive indices:
- Mating performance, pregnancy and parturition
- Offspring viability indices:
- Implantation Losses (%), Live Birth and Viability Indices, Sex Ratio (% males)
Results and discussion
Results: P0 (first parental generation)
General toxicity (P0)
- Clinical signs:
- no effects observed
- Description (incidence and severity):
- There were no treatment-related clinical signs for any of the animals throughout the study.
Male 76 receiving 1000 mg/kg bw/day showed pilo-erection and hunched posture between Days 21 and 39 of the study. Given the isolated nature of these observations, they were considered not to be related to treatment with the test item. - Dermal irritation (if dermal study):
- not examined
- Mortality:
- no mortality observed
- Description (incidence):
- There were no unscheduled deaths on the study.
- Body weight and weight changes:
- no effects observed
- Description (incidence and severity):
- There was no effect of treatment with the test item at any dose level on body weight development in males. For the treated females, group mean body weight gains during the pre-pairing, gestation and lactation phases remained similar to controls indicating no effect of treatment with the test item.
- Food consumption and compound intake (if feeding study):
- no effects observed
- Description (incidence and severity):
- There was no effect of treatment with the test item on dietary intake and food conversion efficiency in males when compared with controls. Treated females also did not show any effect of treatment on food intake and food conversion efficiency (only measured during the pre-pairing phase) as indicated by similar group mean values across all groups including controls.
- Food efficiency:
- not specified
- Water consumption and compound intake (if drinking water study):
- no effects observed
- Description (incidence and severity):
- Daily visual inspection of water bottles did not indicate any intergroup differences between water consumption in treated and control animals of both sexes.
- Ophthalmological findings:
- not examined
- Haematological findings:
- not examined
- Clinical biochemistry findings:
- not examined
- Urinalysis findings:
- not examined
- Behaviour (functional findings):
- not examined
- Immunological findings:
- not examined
- Organ weight findings including organ / body weight ratios:
- no effects observed
- Histopathological findings: non-neoplastic:
- no effects observed
- Description (incidence and severity):
- Qualitative examination of the stages of spermatogenesis in the testis did not reveal any treatment-related abnormalities in the integrity of the various cell types present within the different stages of the sperm cycle. No treatment-related microscopic abnormalities were observed in the evaluation of the ovarian follicles and corpora lutea of the ovaries.
- Histopathological findings: neoplastic:
- no effects observed
- Other effects:
- no effects observed
Reproductive function / performance (P0)
- Reproductive function: oestrous cycle:
- not examined
- Reproductive function: sperm measures:
- no effects observed
- Reproductive performance:
- no effects observed
- Description (incidence and severity):
- Mating performance remained unaffected by treatment with the test item at all dose levels. With the exception of one control pair, all animals mated within the first four days of pairing. There was no appreciable difference in pre-coital interval in treated animals with respect to controls. No treatment-related effects on fertility were seen in animals given the test item when compared with controls. Female 93 given 1000 mg/kg bw/day did not achieve pregnancy following evidence of mating. There was no effect of treatment on gestation length; all littering females showed gestation length between 22 to 23½ days.
In total twelve females from the control, 30, and 300 mg/kg bw/day dose groups and eleven females from 1000 mg/kg bw/day dose group gave birth to a live litter and successfully reared young to Day 5 of age. In the absence of any histopathological correlates in the reproductive organs of the one non-pregnant female (No.93) or in the male partner (No.81) to elucidate the cause of the non-pregnancy this intergroup difference was considered to be incidental and of no toxicological importance.
There were no differences for corpora lutea, implantation sites and pre- or post-implantation sites between treated and control animals. Litter size, viability and sex ratio were similar across all groups including controls.
Effect levels (P0)
- Key result
- Dose descriptor:
- NOEL
- 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
- gross pathology
- reproductive performance
Target system / organ toxicity (P0)
- Key result
- Critical effects observed:
- no
Results: F1 generation
General toxicity (F1)
- Clinical signs:
- no effects observed
- Description (incidence and severity):
- There were no clinical signs for the offspring at any dose level considered to be related to treatment with the test item.
- Dermal irritation (if dermal study):
- not examined
- Mortality / viability:
- no mortality observed
- Description (incidence and severity):
- Litter size, viability and sex ratio were similar across all groups including controls.
- Body weight and weight changes:
- no effects observed
- Description (incidence and severity):
- There was no effect of treatment with the test item on litter weights or offspring body weight development when compared with controls.
- Food consumption and compound intake (if feeding study):
- not examined
- Food efficiency:
- not examined
- Water consumption and compound intake (if drinking water study):
- not examined
- Ophthalmological findings:
- not examined
- Haematological findings:
- not examined
- Clinical biochemistry findings:
- not examined
- Urinalysis findings:
- not examined
- Sexual maturation:
- not examined
- Anogenital distance (AGD):
- not examined
- Nipple retention in male pups:
- not examined
- Organ weight findings including organ / body weight ratios:
- no effects observed
- Gross pathological findings:
- no effects observed
- Description (incidence and severity):
- There were no treatment-related macroscopic abnormalities for interim death or terminal kill offspring.
- Histopathological findings:
- no effects observed
- Description (incidence and severity):
- There were no treatment-related microscopic findings.
- Other effects:
- no effects observed
- Description (incidence and severity):
- Litter size, viability and sex ratio were similar across all groups including controls. The results of surface righting reflex were similar across all groups including controls.
Developmental neurotoxicity (F1)
- Behaviour (functional findings):
- not examined
Developmental immunotoxicity (F1)
- Developmental immunotoxicity:
- not examined
Effect levels (F1)
- Key result
- Dose descriptor:
- NOEL
- Generation:
- F1
- Effect level:
- > 1 000 mg/kg bw/day (nominal)
- Based on:
- test mat.
- Sex:
- male/female
- Basis for effect level:
- viability
- clinical signs
- mortality
- body weight and weight gain
- gross pathology
- histopathology: non-neoplastic
- histopathology: neoplastic
Target system / organ toxicity (F1)
- Key result
- Critical effects observed:
- no
Overall reproductive toxicity
- Key result
- Reproductive effects observed:
- no
- Lowest effective dose / conc.:
- 1 000 mg/kg bw/day (nominal)
- Treatment related:
- no
Applicant's summary and conclusion
- Conclusions:
- The oral (gavage) administration of the test substance to male and female rats at dose levels of 30, 300 and 1000 mg/kg bw/day did not elicit any treatment related systemic or reproductive effects. A ‘No Observed Effect Level’ (NOEL) for systemic and reproductive toxicity was considered to be greater than 1000 mg/kg bw/day (highest dose tested).
- Executive summary:
In a reproductive and developmental toxicity study the substance was administered to rats (12/sex/dose) by oral gavage at dose levels of 0, 30, 300 or 1000 mg/kg bw/day. No effects were reported in the reproductive or developmental parameters monitored during the study and the NOEL is greater than 1000 mg/kg bw/day, this being the highest dose tested.
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