3,3'-[(2,5-dichloro-p-phenylene)bis[imino(1-acetyl-2-oxoethylene)azo]]bis[4-chloro-N-(5-chloro-o-tolyl)benzamide]

Developmental toxicity / teratogenicity

Administrative data

Endpoint:

developmental toxicity

Type of information:

experimental study

Adequacy of study:

key study

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:

2012

Report date:

2013

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: OECD Guideline 422 (Combined Repeated Dose Toxicity Study with the Reproduction / Developmental Toxicity Screening Test)

GLP compliance:

yes (incl. QA statement)

Remarks:

BASF SE Experimental Toxicology and Ecology, 67056 Ludwigshafen, Germany

Limit test:

no

Test material

Test material information

Constituent 1

Reference substance name:

Tetramethyl 2,2'-[1,4-phenylenebis[imino(1-acetyl-2-oxoethane-1,2-diyl)azo]]bisterephthalate

EC Number:

271-176-6

EC Name:

Tetramethyl 2,2'-[1,4-phenylenebis[imino(1-acetyl-2-oxoethane-1,2-diyl)azo]]bisterephthalate

Cas Number:

68516-73-4

Molecular formula:

C34H32N6O12

IUPAC Name:

tetramethyl 2,2'-{1,4-phenylenebis[imino(1,3-dioxobutane-2,1-diyl)diazene-2,1-diyl]}diterephthalate

Test material form:

solid

Details on test material:

Batch DEB2146870
Test material fulfills criteria of a nanomaterial accoring to the EU (information by Sponsor, no further details available).

Specific details on test material used for the study:

- Lot/batch No.: DEB2 146870
- Stability under test conditions: The stability of the test substance under storage conditions over the test period was guaranteed by the manufacturer, and the manufacturer holds this responsibility.
- Storage condition of test material: room temperature

Test animals

Species:

rat

Strain:

Wistar

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River Laboratories, Research Models and Services, Germany GmbH
- Age at study initiation: (P) 10-11 wks
- Fasting period before study: no
- Housing: individually
- Diet: ad libitum
- Water: ad libitum
- Acclimation period: 6 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20-24
- Humidity (%): 30-70
- Air changes (per hr): 15
- Photoperiod (hrs dark / hrs light): 12/12

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

water

Details on exposure:

PREPARATION OF DOSING SOLUTIONS:
Pigment Yellow 155 was applied as a suspension. To prepare this suspension, the appropriate amount of test substance was weighed out depending on the desired concentration. Then, drinking water was filled up to the desired volume, subsequently released with a high speed homogenizer. During administration of the test substance, preparations were kept homogeneous by stirring with a magnetic stirrer. The test substance preparations were produced at least once a week.

VEHICLE
- Concentration in vehicle: 1, 3, or 10 g/100mL, respectively

Analytical verification of doses or concentrations:

yes

Details on mating procedure:

- M/F ratio per cage: 1:1
- Length of cohabitation: maximum of two weeks
- Proof of pregnancy: sperm in vaginal smear referred to as day 0 of pregnancy
- After successful mating each pregnant female was caged: indiviually

Duration of treatment / exposure:

males treated 41 days (pre-mating, post-mating)
females treated 52 days (pre-mating, gestation, 4 days lactation)

Frequency of treatment:

daily

Duration of test:

52 days

Doses / concentrations

Doses / concentrations 1

Dose / conc.:

100 mg/kg bw/day (actual dose received)

Doses / concentrations 2

Dose / conc.:

300 mg/kg bw/day (actual dose received)

Doses / concentrations 3

Dose / conc.:

1 000 mg/kg bw/day (actual dose received)

No. of animals per sex per dose:

10

Control animals:

yes, concurrent vehicle

Examinations

Ovaries and uterine content:

The ovaries and uterine content was examined after termination: Yes
Examinations included:
- Gravid uterus weight: No
- Number of corpora lutea: No data
- Number of implantations: No data
- Number of early resorptions: No
- Number of late resorptions: No
- Other: Histopathology of ovaries and uterus

Fetal examinations:

- External examinations: Yes: [all per litter]
- Soft tissue examinations: Yes: [all per litter]
- Skeletal examinations: No
- Head examinations: No

Indices:

Male mating index, male fertility index, female mating index, female fertility index, gestation index, live birth index, post implantation loss
offspring: Viability index

Results and discussion

Results: maternal animals

Maternal developmental toxicity

Details on maternal toxic effects:

Maternal toxic effects:no effects

Details on maternal toxic effects:
Regarding clinical examinations, signs of general systemic toxicity were not observed in male or female parental animals of test groups 1-3 (100, 300 and 1000 mg/kg bw/d) during the entire study period. All animals of test group 2 and 3 showed yellow discolored feces. This finding was substance-related due to the yellow color of the dye stuff.
Regarding clinical pathology no treatment-related, adverse effects were observed up to a dose of the compound of 1000 mg/kg bw/d.
Regarding pathology, macroscopically yellow discoloration of the content of the digestive tract in numerous animals was observed. In several treated animals and several organs of the digestive tract these yellow pigments could also be observed histopathologically. Beside the discoloration no signs of toxicity in the respective tissues were noted. This finding is regarded to be a consequence to the oral intake of the yellow test substance and therefore treatment related but not adverse in nature.

Regarding fertility and reproductive performance, no signs of toxicity were observed in male or female parental animals of all test groups (100, 300 and 1000 mg/kg bw/d) during the entire study.

Effect levels (maternal animals)

1

Key result

Dose descriptor:

NOAEL

Effect level:

1 000 mg/kg bw/day (actual dose received)

Based on:

test mat.

Basis for effect level:

other: maternal toxicity

2

Key result

Dose descriptor:

NOEL

Effect level:

1 000 mg/kg bw/day (actual dose received)

Based on:

test mat.

Basis for effect level:

other: developmental toxicity

Results (fetuses)

Details on embryotoxic / teratogenic effects:

Embryotoxic / teratogenic effects: no effects

Details on embryotoxic / teratogenic effects:
Regarding developmental toxicity, no signs of toxicity were observed in male or female pups of all test groups (100, 300 and 1000 mg/kg bw/d).

Effect levels (fetuses)

Key result

Remarks on result:

not determinable due to absence of adverse toxic effects

Fetal abnormalities

Key result

Abnormalities:

no effects observed

Overall developmental toxicity

Key result

Developmental effects observed:

no