Registration Dossier

Administrative data

Endpoint:
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
02 February 2016 to 08 March 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
GLP 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:
OECD Guideline 420 (Acute Oral Toxicity - Fixed Dose Method)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method B.1 bis (Acute Oral Toxicity - Fixed Dose Procedure)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Test type:
fixed dose procedure
Limit test:
yes

Test material

Reference
Name:
Unnamed
Test material form:
other: yellow semi-solid

Test animals

Species:
rat
Strain:
Wistar
Sex:
female
Details on test animals and environmental conditions:
ANIMALS and ANIMAL HUSBANDRY
- Female Wistar rats were supplied by Envigo RMS UK Ltd, Oxon, UK.
- The animals were randomly allocated to cages on receipt.
- Females were nulliparous and non-pregnant.
- After an acclimatisation period of at least 5 days the animals were selected at random and given a unique number within the study by indelible ink-marking on the tail and the number was written on a cage card.
- At the start of the study the animals were 8 to 12 weeks of age.

- Body weight did not exceed ± 20 % of the mean body weight at the start of treatment.
- Animals were housed in groups of up to four in suspended solid-floor polypropylene cages furnished with woodflakes.
- With the exception of an overnight fast immediately before dosing, and for approximately 3 to 4 hours after dosing, free access to mains drinking water and food (2014C Teklad Global Rodent diet supplied by Envigo Research UK Ltd, Oxon, UK was allowed throughout the study.
- Diet, drinking water and bedding were routinely analysed and were considered not to contain any contaminants that would reasonably be expected to affect purpose or integrity of the study.
- Temperature and relative humidity were set to achieve limits of 19 to 25 °C and 30 to 70 % respectively.
- Rate of air exchange was at least 15 changes per hour.
- Lighting was controlled by a time switch to give 12 hours continuous light and 12 hours darkness.
- Animals were provided with environmental enrichment items considered not to contain any contaminant at a level that might affect the purpose or integrity of the study.

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
arachis oil
Details on oral exposure:
TEST ITEM PREPARTION and EXPERIMENTAL PREPARATION
- For the purpose of the study, the test item was freshly prepared, as required, as a solution in arachis oil BP. This vehicle was chosen because the test material did not dissolve or suspend in distilled water.
- The test item was formulated within 2 hours of being applied to the test system and it was assumed that the formulation was stable for that duration.
- No analysis was conducted to determine the homogeneity, concentration or stability of the test item formulation. This is an exception with regard to GLP and was reflected in the GLP compliance statement.
Doses:
- 300 mg/kg was chosen as the starting dose (concentration 30 mg/mL; dose volume 10 mL/kg)
- Additional dose 2000 mg/kg (concentration 200 mg/mL; dose volume 10 mL/kg)
No. of animals per sex per dose:
- Single female animal dosed at 300 mg/kg as the starting dose.
- In the absence of toxicity at 300 mg/kg, a single female animal dosed at 2000 mg/kg
- In the absence of mortality at 2000 mg/kg, an additional group of four female animals dosed at 2000 mg/kg
Control animals:
no
Details on study design:
- All animals were dosed once by gavage using a metal cannula attached to a graduated syringe.
- The volume administered to each animal was calculated according to the fasted body weight at the time of dosing.
- Treatment of animals was sequential.
- Sufficient time was allowed between each dose level to confirm the survival of the previously dosed animals.
- Clinical observations were made 0.5, 1, 2 and 4 hours after dosing and then daily for 14 days.
- Morbidity and mortality checks were made twice daily.
- Individual body weights were recorded on Day 0 (the day of dosing) and on Days 7 and 14.
- Animals were killed by cervical dislocation at the end of the observation period.
- All animals were subjected to gross necropsy consisting of external examination and opening of the abdominal and thoracic cavities. The appearance of any macroscopic abnormalities was recorded but no tissues were retained.
Statistics:
EVALUATION OF DATA
- The test item was evaluated according to Annex 3 of the OECD Guidelines for Testing of Chemicals No 420 "Acute Oral Toxicity - Fixed Dose Method (adopted 17 December 2001) as shown in the flow chart in Annex 2 (attached).
- Evaluation of data included identification of the number of animals that died during the study (or that were killed for humane reasons), and determination of the nature, severity, onset and duration of toxic effects. If possible, the signs of evident toxicity were described. Evident toxicity refers to the toxic effects of sufficient severity that administration of the next higher dose level could result in development of severe signs of toxicity and probable mortality.
- Effects on body weights and abnormalities noted at necropsy were also identified.
- Using the mortality data obtained, an estimate of the acute oral median lethal dose (LD50) of the test item was made.

Results and discussion

Preliminary study:
DOSE LEVEL 300 mg/kg
-There was no mortality.
- No signs of systemic toxicity were noted during the observation period.
- The animal showed expected gains in body weight over the observation period.
- No abnormalities were noted at necropsy.
Effect levels
Key result
Sex:
female
Dose descriptor:
LD50
Effect level:
> 2 000 mg/kg bw
Based on:
test mat.
Mortality:
- There were no deaths.
Clinical signs:
- Noisy respiration was noted in the initial animal, 13 and 14 days after dosing. No other signs of systemic toxicity were noted.
Body weight:
- Animals showed expected gains in body weight over the observation period; except for one animal which showed expected gain in body weight during the first week but body weight loss during the second week.
Gross pathology:
- No abnormalities were noted at necropsy.

Applicant's summary and conclusion

Interpretation of results:
other: Not classifiied
Remarks:
EU
Conclusions:
The acute oral median lethal dose (LD50) of the test item in the female Wistar strain rat was considered to be greater than 2000 mg/kg body weight.
Executive summary:

INTRODUCTION

The study was performed to assess the acute oral toxicity of the test item in the Wistar strain rat.

METHODS

Following a sighting test at dose levels of 300 mg/kg and 2000 mg/kg, a further group of four fasted females was given a single oral dose of the test item, as a solution in arachis oil BP, at a dose level of 2000 mg/kg body weight. Clinical signs and body weight development were monitored during the study. All animals were subjected to gross necropsy.

RESULTS

Mortality: there were no deaths.

Clinical observations: Noisy respiration was noted in the initial animal, treated at a dose level of 2000 mg/kg, 13 and 14 days after dosing. No other signs of systemic toxicity were noted.

Body weight: Animals showed expected gains in body weight over the observation period, except for one animal treated at a dose level of 2000 mg/kg which showed expected gain in body weight during the first week but body weight loss during the second week.

Necropsy: No abnormalities were noted at necropsy.

CONCLUSION

The acute oral median lethal dose (LD50) of the test item in the female Wistar strain rat was estimated to be greater than 2000 mg/kg body weight.