Registration Dossier

Administrative data

Endpoint:
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
12 April 2012 - 03 May 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study was conducted to EEC, OECD, US EPA, and Japanese test guidelines, and in compliance with GLP.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2012
Report Date:
2012

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
EU Method B.1 tris (Acute Oral Toxicity - Acute Toxic Class Method)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 870.1100 (Acute Oral Toxicity)
Deviations:
no
Qualifier:
according to
Guideline:
other: Japanese Ministry of Agriculture, Forestry and Fisheries, Test Data for Registration of Agricultural Chemicals, Acute oral toxicity (2-1-1), 12 Nousan No 8147, Agricultural Production Bureau, November 24, 2000.
Deviations:
no
GLP compliance:
yes (incl. certificate)
Remarks:
The study report included a current certificate of GLP compliance for the test facility, issued by the MHRA.
Test type:
acute toxic class method
Limit test:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Physical state: Off-white solid
- Storage condition of test material: aprox. -20 degrees in the dark.

Test animals

Species:
rat
Strain:
other: CD (Crl: CD 'SD')
Sex:
female
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: Charles River (UK) Ltd
- Age at study initiation: approximately eight to twelve weeks prior to dosing (day 1).
- Weight at study initiation: In the range 198 to 221 g.
- Fasting period before study: no access to food overnight before dosing.
- Housing: Animals were housed in solid bottomed polycarbonate cages with a stainless steel mesh lid. Each cage contained a quantity of autoclaved wood flake bedding. Cages, food hoppers, water bottles and bedding were changed at appropriate intervals.
- Diet (e.g. ad libitum): The animals were allowed free access to a standard pelleted rodent diet.
- Water (e.g. ad libitum): Potable water taken from the public supply was freely available via polycarbonate bottles fitted with sipper tubes.
- Acclimation period: at least 5 days.

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19 to 23°C.
- Humidity (%): 40 to 70% relative humidity.
- Air changes (per hr): The animal room was kept at positive pressure with respect to the outside by its own supply of filtered fresh air, which was passed to atmosphere and not re-circulated. Number of changes per hour not specified.
- Photoperiod (hrs dark / hrs light): 12 hours darkness / 12 hours light.


IN-LIFE DATES: From: 12 April 2012 (initial animal allocation) To: 03May 2012 (date of necropsy).

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
other: purified water
Details on oral exposure:
MAXIMUM DOSE VOLUME APPLIED: 10 mL/kg


DOSAGE PREPARATION (if unusual): 200 mg/mL in vehicle


CLASS METHOD (if applicable)
- Rationale for the selection of the starting dose: The dose levels for the study were chosen in compliance with the study guidelines and based on previous infomation, the initial dose was 2000 mg/kg bw.
Doses:
2000 mg/kg (Dosed 17 April 2012 and 19 April 2012)
No. of animals per sex per dose:
6 (2 groups of three per dose level)
Control animals:
no
Details on study design:
- Duration of observation period following administration: all animals were observed for 14 days after dosing.
- Frequency of observations and weighing: Mortalities were checked twice per day. Clinical signs were observed soon after dosing and at frequent
intervals during day 1. On subsequent days all animals were observed twice per day except day 15 (day of necropsy, observation in the morning only). Bodyweights were recorded on day 1 (prior to dosing) and on days 8 and 15.
- Necropsy of survivors performed: yes
- Other examinations performed: macroscopic pathology. All animals were subject to a macroscopic examination which consisted of opening the cranial, thoracic and abdominal cavities. The macroscopic appearance of all examined organs was recorded.

Results and discussion

Effect levels
Sex:
female
Dose descriptor:
LD50
Effect level:
> 2 000 mg/kg bw
Based on:
test mat.
Mortality:
There were no deaths during the study.
Clinical signs:
There were no clinical signs of reaction to treatment throughout the study.
Body weight:
All animals were considered to have achieved satisfactory bodyweight gains throughout the observation period, demonstrating that there was no
effect of treatment upon bodyweight.
Gross pathology:
There were no treatment-related macroscopic changes.

Applicant's summary and conclusion

Interpretation of results:
not classified
Remarks:
Migrated information Criteria used for interpretation of results: EU
Conclusions:
The acute median lethal oral dose (LD50) to rats of the test substance was demonstrated to be greater than 2000 mg/kg bodyweight.
Executive summary:

An acute oral toxicity study was performed by Huntingdon Life Sciences, UK, to determine the acute oral toxicity of the test substance. The study was conducted to EEC, OECD, EPA and Japanese test guidelines, and complied to GLP. Groups of six female rats were dosed by oral gavage at 2000 mg/kg bodyweight, then observed for 14 days prior to necropsy. No deaths occurred during the study. No clinical signs were observed after dosing or during the observation period. No treatment-related macroscopic pathological signs were observed. The acute median lethal oral dose (LD50) to rats of the test substance was demonstrated to be greater than 2000 mg/kg bodyweight.