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Administrative data

Endpoint:
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2016-05-19 to 2016-07-25
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2016
Report date:
2016

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
EU Method B.1 tris (Acute Oral Toxicity - Acute Toxic Class Method)
Version / remarks:
(2008)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)
Version / remarks:
(2001)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Test type:
acute toxic class method
Limit test:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
Tetraethylammonium benzoate
EC Number:
240-957-3
EC Name:
Tetraethylammonium benzoate
Cas Number:
16909-22-1
Molecular formula:
C8H20N.C7H5O2
IUPAC Name:
tetraethylazanium benzoate
Test material form:
liquid
Details on test material:
tetraethylammonium benzoate manufactured by Evonik Degussa GmbH, batch BRA 1434, purity 49.9 w/w (excluding solvent)

Test animals

Species:
rat
Strain:
other: CD / Crl: CD(SD)
Sex:
female
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Source: Charles River Laboratories, Research Models and Services, Germany GmbH, Sandhofer Weg 7, 97633 Sulzfeld, Germany
- Strain: Rat (Rattus norvegicus) / CD / Crl: CD(SD)
- Age at start of administration: Approx. 8 weeks
- Weight at start of administration: 165 - 190 g
- Fasting period before study: approx. 16 hours
- Housing: During the 14-day observation period the animals were kept in groups of 3 animals in MAKROLON cages (type III plus). Granulated
textured wood was used as bedding material for the cages.
- Diet:Commercial diet, ssniff® R/M-H V1534 (Certificates of analysis provided) ; discontinued approx. 16 hours before administration
- Water: tap water ad libitum
- Acclimation period: At least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C):22°C ± 3°C
- Humidity (%): 55% ± 15%
- Photoperiod (hrs dark / hrs light): 12 hrs dark/12 hrs light (about 150 lux at approx. 1.50 m room height)




Administration / exposure

Route of administration:
oral: gavage
Vehicle:
other: 0.8% aqueous hydroxypropylmethylcellulose
Details on oral exposure:
Vehicle: test item was used as supplied for 2000 mg/kg b.w. or dissolved in 0.8% aqueous hydroxypropylmethyl-cellulose for 300 mg/kg b.w.
Route of administration Oral, by gavage
Selection of route of administration According to the OECD/EC guidelines
Administration volume 3.85 mL/kg b.w.
Dose levels 300 and 2000 mg/kg b.w.



DOSAGE PREPARATION: Test item 50% was used as supplied (2000 mg/kg b.w.) or dissolved in 0.8% aqueous hydroxypropyl¬methyl¬cellulose (300 mg/kg b.w.). 0.8% aqueous hydroxyl¬propylmethylcellulose was chosen as vehicle as it is known not to produce toxic effects. A correction factor of 2.0 was used because the supplied test item contains 50.0% water. The concentrations refer to Test item. The administration volume was 3.85 mL/kg b.w. as the density amounted to 1.04 g/mL.


CLASS METHOD (if applicable)
Principle of the ATC-test method
This procedure permits the identification of the 'acute-toxic-class' (ATC), a measure-ment of the acute toxicity by the oral route.

The test item is administered orally by gavage at a single dose level to a group of experimental animals. The dose used is selected from a series of defined dose levels. Due to the small number of animals used with this method, there is no need to perform a range finding test.
The test item is tested using a stepwise procedure, each step uses three female animals. The results of each step determine if:
o no further testing is needed,
o the next step will be performed with the same dose,
o the next step will be performed at the next higher or next lower dose level.

Starting at 2000 mg/kg b.w.
Three animals of one sex (preferably females) are treated at 2000 mg/kg b.w. (first step).
If, two to three animals die, testing at 300 mg/kg b.w. should be performed. If, in this second step, no to one animal dies, no further testing is necessary.
Testing at 300 mg/kg b.w.:
Three female animals are treated at 300 mg/kg b.w. (first step).
If fewer than two animals die, the test item should be retested (second step) with 300 mg/kg b.w., using three animals of the same sex.
Doses:
300 and 2000 mg/kg b.w.
No. of animals per sex per dose:
3 female animals 2000 mg/kg b.w.
6 female animals 300 mg/kg b.w.
Control animals:
no
Details on study design:
- Duration of observation period following administration: 14 days

- Frequency of observations and weighing: Observations were performed before and immediately, 5, 15, 30 and 60 min, as well as 3, 6 and 24 hours
after administration. All surviving animals were observed for a period of 14 days. Individual body weights were recorded before administration
of the testsubstance and thereafter in weekly intervals up to the end of the study.

- Other examinations performed: changes of skin and fur, eyes and mucous membranes, respiratory and the circulatory,autonomic and central
nervous system and somatomotor activity as well as behaviour pattern were observed at least once a day until all symptoms subsided, thereafter
each working day. Any tremors, convulsions, salivation, diarrhoea, lethargy, sleep and coma were also noted.

- Necropsy of survivors performed: At the end of the experiments, all animals were sacrificed, dissected and inspected macroscopically. All gross
pathological changes were recorded.

- No histopathology was carried out as no macroscopical findings were noted at autopsy.
Statistics:
No statistical analysis was performed as the method used is not intended to allow a calculation of a precise LD50 value.

Results and discussion

Effect levels
Key result
Sex:
female
Dose descriptor:
LD50
Effect level:
> 300 - < 2 000 mg/kg bw
Mortality:
2000 mg test item/kg b.w.: All 3 animals died within 10 minutes after administration
Clinical signs:
other: Under the present test conditions, oral administration of 2000 mg test item/kg b.w. revealed moderately reduced motility, moderate ataxia, moderately reduced muscle tone, moderate dyspnoea and abdominal position in all 3 of three animals. Oral administrat
Gross pathology:
No pathological changes were observed at necropsy.
Other findings:
- Histopathology:
No histopathology was carried out as no macroscopical findings were noted at autopsy.

Any other information on results incl. tables

no further information

Applicant's summary and conclusion

Conclusions:
The LD50 value was ranked between 300 and 2000 mg/kg b.w.
According to the Globally Harmonized Classification System (GHS) the test item is classified in the hazard category 4, required labelling with 'Warning' and 'Harmful if swallowed'.
According to the EC Regulation 1272/2008 and subsequent regulations, the test item required labelling with 'Warning' and 'H302: Harmful if swallowed'
Executive summary:

Aim of the experiment was to obtain information on the toxicity, in particular lethality, of the test item.

Acute toxicity, oral, in rats according to OECD guideline 423 and EC method B.1 tris - ATC method - was employed to establish the required information for hazard assessment and hazard classification.

Test item 50% was used as supplied (2000 mg/kg b.w.) or dissolved in 0.8% aqueous hydroxypropylmethylcellulose (300 mg/kg b.w.).

A correction factor of 2.0 was used because the supplied test item contains 50.0% water. The concentrations refer to the test item.

Dose levels of 2000 or 300 mg test item/kg b.w. were employed.

Under the present test conditions, oral administration of 2000 mg test item/kg b.w. revealed moderately reduced motility, moderate ataxia, moderately reduced muscle tone, moderate dyspnoea and abdominal position in all 3 of three animals.

All 3 animals died within 10 minutes after administration.

Oral administration of 300 mg test item/kg b.w. did not revealany clinical signs of toxicity. One of six animals seemed to be reduced in body weight gain. No animal died prematurely.

No pathological changes were observed at necropsy.

The LD50value was ranked between 300 and 2000 mg/kg b.w.

Test item

LD50[mg/kg b.w., oral]

females

300 - 2000