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Administrative data

Key value for chemical safety assessment

Effects on fertility

Link to relevant study records
Reference
Endpoint:
toxicity to reproduction
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Reproductive effects observed:
not specified
Effect on fertility: via oral route
Endpoint conclusion:
no study available
Effect on fertility: via inhalation route
Endpoint conclusion:
no study available
Effect on fertility: via dermal route
Endpoint conclusion:
no study available
Additional information

Although no specific reproductive toxicity studies have been conducted with amides, C8-18 and C18-unsatd., N,N-bis(hydroxyethyl), testing for reproductive toxicity is not considered necessary. This is based on the fact that studies investigating the repeated dose toxicity of amides, C8-18 and C18-unsatd., N,N-bis(hydroxyethyl) or structurally related substance LDEA or ODEA following 28 day, 90 day or 2 year chronic exposure (Sections 5.6. Repeated dose toxicity and 5.8. Carcinogenicity) did not show any effects on reproductive organs at highest treatment levels. Also, no toxicity to the reproductive system is known for the potential metabolism products of the substance, e.g. DEA and the corresponding fatty acids (see Section 5.1). Hence, under conditions of normal and foreseeable use, amides, C8-18 and C18-unsatd., N,N-bis(hydroxyethyl) is not expected to have any effects on fertility.

 


Short description of key information:
Data waiving since scientifically unjustified.

Effects on developmental toxicity

Description of key information
Structurally similar amides, C12-18(even numbered) and C18(unsatd.), N,N-bis(hydroxyethyl) was not toxic to pregnant rats and did not reveal any embryotoxic or teratogenic potential at dose levels up to 1,000 mg/kg bw/day.
Link to relevant study records
Reference
Endpoint:
developmental toxicity
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Study period:
Not reported
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: The study was conducted according to the OECD Guideline 414 (Teratogenicity) and the EU Directives 87/302/EEC and 91/325/EEC. Compliance to GLP has been claimed through the GLP regulations according to the Chemical Act (FRG), March 14, 1990.
Justification for data waiving:
other:
Reason / purpose:
reference to same study
Reason / purpose:
reference to other study
Qualifier:
according to
Guideline:
OECD Guideline 414 (Prenatal Developmental Toxicity Study)
Deviations:
no
Qualifier:
according to
Guideline:
other: Official Journal of European Community L 133, May 30, 1988; 87/302/EEC
Deviations:
no
Qualifier:
according to
Guideline:
other: Official Journal of European Community L 180, March 01, 1991; 91/325/EEC
Deviations:
no
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes
Limit test:
no
Species:
rat
Strain:
Sprague-Dawley
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: Charles River, Wiga D-Sulzfeld
- Age at study initiation: 8-10 wk
- Weight at study initiation: 209 g (mean)
- Housing: Single animal in Makrolon Type M3 cage (Ebeco) with standard softwood bedding
- Diet: Pelleted Altromin Maintenance Diet 1324, ad libitum
- Water: Tap water, ad libitum
- Acclimation period: 5 d


ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20-24
- Humidity (%): 43-66
- Air changes (per h): 10-15
- Photoperiod (h dark/h light): 12/12


Route of administration:
oral: gavage
Vehicle:
other: Arachidis oil, DAB 9
Details on exposure:
PREPARATION OF DOSING SOLUTIONS: Test material was suspended in Arachidis oil, DAB 9 such that the required dose per kg body weight was contained in 5 mL.

VEHICLE
- Concentration in vehicle: 0, 20, 60 and 200 mg/mL

Analytical verification of doses or concentrations:
no
Details on analytical verification of doses or concentrations:
Not applicable
Details on mating procedure:
- Impregnation procedure: Purchased timed pregnant
Duration of treatment / exposure:
From Day 6 up to Day 15 post coitum
Frequency of treatment:
Once daily
Duration of test:
20 d
Remarks:
Doses / Concentrations:
0, 100, 300 and 1,000 mg/kg/d
Basis:
actual ingested
Dosing on the basis of body weight of Day 6 post coitum
No. of animals per sex per dose:
30
Control animals:
yes, concurrent vehicle
Details on study design:
- Dose selection rationale: Based on the results of toxicological examinations done before (Report No. 486 = TBD 830034, June 27, 1983) (details not reported)
Maternal examinations:
CAGE SIDE OBSERVATIONS: Yes
- Time schedule: Twice daily

BODY WEIGHT: Yes
- Time schedule for examination: On Day 0, 6, 16 and 20 post coitum

POST-MORTEM EXAMINATIONS: Yes
- Sacrifice on gestation Day 20
- Organs examined: All maternal organs, with emphasis on the uterus and uterine contents
Ovaries and uterine content:
The ovaries and uterine content was examined after termination: Yes
Examinations included:
- Gravid uterus weight: Yes
- Number of corpora lutea: Yes
- Number of implantations: Yes
- Number of early resorptions: Yes
- Number of late resorptions: Yes
- Other: Position of fetus in the uterus
Fetal examinations:
- External examinations: Yes: [all per litter]
- Soft tissue examinations: Yes: [approximately half per litter]
- Skeletal examinations: Yes: [approximately half per litter]
- Head examinations: Yes: [approximately half per litter]

(See Table 1 for exact number of fetuses examined)
Statistics:
The following statistical methods were used:
If the variables could be assumed to follow a normal distribution, the Dunnett-Test, based on a pooled variance, was applied for the
comparison between the treated groups and the control group.
The Steel-Test was applied when the data could not be assumed to follow a normal distribution.
Fisher's Exact test for 2x2 tables was applied if the variables could be dichotomized without loss of information (Bonferroni-Holm-corrected).
Indices:
- Pre-implantation loss (%) = [(Number of corpora lutea - number of implantations)/number of corpora lutea] X 100
- Post-implantation loss (%) = [(Number of implantations - number of live fetuses)/number of implantations] X 100
- Sex ratio (%) = [(number of males/females)/number of fetuses] X 100
Historical control data:
None
Details on maternal toxic effects:
Maternal toxic effects:no effects

Details on maternal toxic effects:
Mortality: No mortality at any dose level.

Clinical symptoms: Salivation and propulsion of the head in all dose groups. Additionally, the highest dose group showed a severe salivation. These symptoms were noted variable in the individual groups during the application period.

Body weight: No treatment-related effects on body weight gain were observed in the dams.

Necropsy: No macroscopic changes were observed in the survived dams except for one dam at 100 mg/kg/d, which showed greenish-brownish fluid in the uterine horn.

Placenta and uterus weight: No significant differences between the control and the treatment groups.

Reproduction data: Pre-implantation loss was not affected by the treatment. The post-implantation loss and total embryonic deaths were significantly increased in all treatment groups. However, these findings were considered to be incidental because the values in the 100 mg/kg/d group were significantly greater than other two higher dose groups and in each group there was one single female with a high incidence of embryonic death.


Dose descriptor:
NOAEL
Effect level:
> 1 000 mg/kg bw/day
Basis for effect level:
other: maternal toxicity
Dose descriptor:
NOAEL
Effect level:
> 1 000 mg/kg bw/day
Basis for effect level:
other: developmental toxicity
Details on embryotoxic / teratogenic effects:
Embryotoxic / teratogenic effects:no effects

Details on embryotoxic / teratogenic effects:
Body weight: The weights of live fetuses exhibited no significant differences on a litter and individual basis.

Sex ratios: The sex ratio of the fetuses was not affected by the treatment.

External examinations: No macroscopic findings were observed at external examination of fetuses which were considered to be an effect of the treatment. 1 dead fetus in control and 7 dead fetuses (4 out of 7 partly mummified) in 100 mg/kg/d group were recorded. One fetus showed a stump tail at 300 mg/kg/d and paleness was observed in one fetus at 1,000 mg/kg/d. These singular findings are normal observations in the animal strain used.

Visceral examination: No treatment-related abnormalities.

Skeletal examination:
(i) Retardations: No significant finding at 100 mg/kg/d. Two sternebrae were non-ossified in 19 and 29 fetuses (statistically significant) at 300 and 1,000 mg/kg/d, respectively. Statistically significant increase in the number of fetuses with incomplete ossification of skull bones (17 fetuses) and decrease in the number of fetuses with incomplete ossification of 13th rib (0 fetus) was observed at 1,000 mg/kg/d. The increased "incomplete ossified skull bones" was essentially due to only 2 dams. The other statistically significant differences were considered to be incidental because these retardation effects were not accompanied by weight retardation and were within the normal range of variation for this strain.
(ii) Variations: No variations in any group.
(iii) Malformations: One fetus with stump tail and missing vertebrae coccigycae at 300 mg/kg/d (not considered to be treatment-related).

Abnormalities:
not specified
Developmental effects observed:
not specified

Table 2. Summary of performance of mated females

Treatment dose (mg/kg/d)

0

100

300

1,000

No. of mated females

30

30

30

30

No. of pregnant females

30

29

28

29

No. of females

with premature litter

1

0

2

3

No. of mortalities

0

0

0

0

No. of females with live

fetuses at termination

29

29*

26

26

* One dam out of these was not included because the weights of fetuses were not determined.

Conclusions:
Based on the results, amides, C12-18(even-numbered) and C18(unsatd.), N,N-bis(hydroxyethyl) was found not to be cumulative toxic to pregnant rats and did not reveal any embryotoxic or teratogenic potential to Sprague-Dawley CD rats at dose levels up to 1,000 mg/kg bw/d.
Executive summary:

A study was carried out to assess the effects of the structurally similar amides, C12-18 (even-numbered) and C18-unsatd., N,N-bis(hydroxyethyl) on embryonic and foetal development in pregnant Sprague-Dawley CD rats according to OECD guideline 414.

The test substance was administered to groups of 30 female rats by gavage at dose levels of 0, 100, 300 and 1,000 mg/kg bw/day, once daily from Day 6 to Day 15 of gestation inclusive. Control animals were dosed with the vehicle alone (arachidis oil, DAB 9). Clinical condition and reaction to treatment were recorded at least once daily. Body weights were reported on Days 0, 6, 16 and 20 of gestation. All surviving females were sacrificed on Day 20 of gestation and the foetuses were removed by caesarean section. At necropsy, the females were examined macroscopically. Live foetuses were weighed, sexed and examined for visceral and skeletal abnormalities.

No deaths or treatment-related changes in body weight gain and necropsy findings were observed in dams at any dose level. Treatment-related symptoms observed in all groups were salivation and propulsion of the head. The highest dose group showed severe salivation. Apart from the control (1 dead foetus) and the 100 mg/kg bw/day groups (7 dead foetuses), all females had viable foetuses. Pre-implantation loss and mean numbers of resorptions were not affected by treatment. The data for post-implantation loss, embryonic deaths and total foetuses showed some deviations which were considered to be non-treatment-related. Mean foetal placental and uterus weights were not affected by the treatment. Foetal sex ratio was comparable in all groups. No treatment-related foetal abnormalities were found at necropsy. The examined foetuses showed no treatment-related visceral and skeletal abnormalities/variations. One foetus at 300 mg/kg bw/day showed a stump tail and missing coccigycae vertebrae. Further, the data for skeletal ossifications showed some deviations in the two highest dose groups. However, all these effects were assessed to be non-treatment-related.

Based on the results, amides, C12-18 (even-numbered) and C18-unsatd., N,N-bis(hydroxyethyl) was not considered to be toxic to pregnant Sprague-Dawley CD rats or to have any embryotoxic or teratogenic potential at dose levels up to 1,000 mg/kg bw/day (Pittermann, 1994).

Effect on developmental toxicity: via oral route
Endpoint conclusion:
no adverse effect observed
Dose descriptor:
NOAEL
1 000 mg/kg bw/day
Study duration:
subacute
Species:
rat
Quality of whole database:
Sufficient data available.
Additional information

A study was carried out to assess the effects of the structurally similar amides, C12-18 (even-numbered) and C18-unsatd., N,N-bis(hydroxyethyl) on embryonic and foetal development in pregnant Sprague-Dawley CD rats according to OECD guideline 414. The test substance was administered to groups of 30 female rats by gavage at dose levels of 0, 100, 300 and 1,000 mg/kg bw/day, once daily from Day 6 to Day 15 of gestation inclusive. Control animals were dosed with the vehicle alone (arachidis oil, DAB 9). Clinical condition and reaction to treatment were recorded at least once daily. Body weights were reported on Days 0, 6, 16 and 20 of gestation. All surviving females were sacrificed on Day 20 of gestation and the foetuses were removed by caesarean section. At necropsy, the females were examined macroscopically. Live foetuses were weighed, sexed and examined for visceral and skeletal abnormalities. No deaths or treatment-related changes in body weight gain and necropsy findings were observed in dams at any dose level. Treatment-related symptoms observed in all groups were salivation and propulsion of the head. The highest dose group showed severe salivation. Apart from the control (1 dead foetus) and the 100 mg/kg bw/day groups (7 dead foetuses), all females had viable foetuses. Pre-implantation loss and mean numbers of resorptions were not affected by treatment. The data for post-implantation loss, embryonic deaths and total foetuses showed some deviations which were considered to be non-treatment-related. Mean foetal placental and uterus weights were not affected by the treatment. Foetal sex ratio was comparable in all groups. No treatment-related foetal abnormalities were found at necropsy. The examined foetuses showed no treatment-related visceral and skeletal abnormalities/variations. One foetus at 300 mg/kg bw/day showed a stump tail and missing coccigycae vertebrae. Further, the data for skeletal ossifications showed some deviations in the two highest dose groups. However, all these effects were assessed to be non-treatment-related. Based on the results, amides, C12-18 (even-numbered) and C18-unsatd., N,N-bis(hydroxyethyl) was not considered to be toxic to pregnant Sprague-Dawley CD rats or to have any embryotoxic or teratogenic potential at dose levels up to 1,000 mg/kg bw/day (Pittermann, 1994).

Justification for classification or non-classification

The available data suggests that amides, C8-18 and C18-unsatd., N,N-bis(hydroxyethyl) is not a reproductive toxicant with regards to fertility or developmental effects. Therefore no classification is required for these endpoints according to EC (67/548/EEC) and CLP (EC 1272/2008) criteria.