222 OP

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2012

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Well performed Guideline study according to GLP.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2012

Report date:

2012

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.1 tris (Acute Oral Toxicity - Acute Toxic Class Method)

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.1100 (Acute Oral Toxicity)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test type:

acute toxic class method

Limit test:

no

Test material

Test material information

Constituent 1

Test material form:

solid: particulate/powder

Remarks:

migrated information: powder

Test animals

Species:

rat

Strain:

Wistar

Sex:

female

Details on test animals or test system and environmental conditions:

Housing and Feeding Conditions
- Full barrier in an air-conditioned room
- Temperature: 22 +/- 3 °C
- Relative humidity: 55 +/- 10%
- Artificial light, sequence being 12 hours light, 12 hours dark
- Air change: 10 x / hour
- Free access to Altromin 1324 maintenance diet for rats and mice (lot no. 0815)
- Free access to tap water, sulphur acidified to a pH value of approximately 2.8 (drinking water, municipal residue control,
microbiological controls at regular intervals)
- The animals were kept in groups / individually in IVC cages, type III H, polysulphone cages on Altromin saw fibre bedding (lot no. 110811)
- Certificates of food, water and bedding are filed at BSL BIOSERVICE
- Adequate acclimatisation period (at least five days) under laboratory conditions

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

physiological saline

Details on oral exposure:

The animals were marked for individual identification by tail painting.
Prior to the administration a detailed clinical observation was made of all animals.
Prior to the administration food was withheld from the test animals for 16 to 19 hours (access to water was permitted). Following the period of fasting the animals were weighed and the test item was administered. Food was provided again approximately 4 hours post dosing.
The test item was administered at a single dose by gavage using a feeding tube.
The test item was administered at a dose volume of 10 mL/kg body weight.

Doses:

300 and 2000 mg/kg bw

No. of animals per sex per dose:

3

Control animals:

no

Details on study design:

The starting dose was selected to be 300 mg/kg body weight. As no compound-related mortality was recorded for any animal of step 1,
it was decided for animal welfare reason to directly move on to a dose of 2000 mg/kg body weight in a second step.
Based on these results and according to the acute toxic class method regime, a third step was performed at a dose of 2000 mg/kg body weight.
Based on these results and according to the acute toxic class method regime no further testing was required.

Observation Period
All animals were observed for 14 days after dosing for general clinical signs, morbidity and mortality.

Weight Assessment
The animals were weighed on day 1 (prior to the administration) and on days 8 and 15.

Clinical Examination
A careful clinical examination was made several times on the day of dosing (at least once during the first 30 minutes and with special attention given during the first 4 hours post-dose). As soon as symptoms were noticed they were recorded.
Thereafter, the animals were observed for clinical signs once daily until the end of the observation period. All abnormalities were recorded.
Cageside observations included changes in the skin and fur, eyes and mucous membranes. Also respiratory, circulatory, autonomic and central nervous systems and somatomotor activity and behaviour pattern were examined.
Particular attention was directed to observations of tremor, convulsions, salivation, diarrhoea, lethargy, sleep and coma.
 
Pathology
At the end of the observation period the surviving animals were sacrificed with an overdosage of pentobarbital injected
intraperitoneally (Narcoren®, Merial; lot no.: 218121; expiry date: 12/2014) at a dosage of approximately 8 mL/kg bw.
All animals were subjected to gross necropsy. All gross pathological changes were recorded and in case of findings the tissues were preserved for a possible histopathological evaluation. The preserved tissues of which no histopathological evaluation was made will be discarded 3 months after the release of the final report unless otherwise agreed upon with the sponsor.

Statistics:

According to OECD guidelines, the biological relevance of the results is the criterion for the interpretation of results,
a statistical evaluation of the results is not regarded as necessary.

Results and discussion

Effect levels

Sex:

female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

All animals survived until the end of the study without showing any signs of toxicity.

Clinical signs:

All animals survived until the end of the study without showing any signs of toxicity.

Body weight:

Throughout the 14-day observation period, the body weight gain of the test animals was within the normal range of variation for this strain.

Gross pathology:

At necropsy, no macroscopic findings were observed in any animal of any step.

Applicant's summary and conclusion

Interpretation of results:

not classified

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

Under the conditions of the present study, a single oral application of the substance to rats at a dose of 2000 mg/kg body weight was associated with no signs of toxicity or mortality. The median lethal dose of the test item after a single oral administration to female rats, observed over a period of 14 days is: LD50 > 2000 mg/kg body weight.

Executive summary:

Under the conditions of the present study, a single oral application of the substance to rats at a dose of 2000 mg/kg body weight was associated with no signs of toxicity or mortality. The median lethal dose of the test item after a single oral administration to female rats, observed over a period of 14 days is: LD50 cut-off (rat): unclassified In conformity with the criteria given in Annex VI to Commission Directive 2001/59/EC the test item has no obligatory labelling requirement for toxicity. According to Annex I of Regulation (EC) 1272/2008 the test item has no obligatory labelling requirement for toxicity and is not classified. According to GHS (Globally Harmonized Classification System) the test item has no obligatory labelling requirement for toxicity and is not classified.