Registration Dossier

Administrative data

Endpoint:
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Experimental start date 06 April 2017 Experimental completion date 03 May 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2017
Report Date:
2017

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
Type:
Constituent
Specific details on test material used for the study:
Identification: 2,2'-[propane-1,3-diylbis(oxy)]bis(3",5,5"-tri-tert-butyl-5'-methyl-1,1':3',1"-terphenyl-2’-ol)
Batch: 1502501005
CAS number: 1042662-40-7
Purity: 98.1%
Physical state/Appearance: Sponsor - solid powder, white, odorless
Envigo - white powder
Expiry Date: 01 February 2025
Storage conditions: room temperature in the dark

Test animals

Species:
rat
Strain:
Wistar
Sex:
female
Details on test animals and environmental conditions:
Animal Information
Female Wistar (RccHan™:WIST) strain rats were supplied by Envigo RMS (UK) Limited, Oxon, UK. On receipt the animals were randomly allocated to cages. The females were nulliparous and non pregnant. After an acclimatization period of at least 5 days the animals were selected at random and given a number unique within the study by indelible ink marking on the tail and a number written on a cage card. At the start of the study the animals were 8 to 12 weeks of age. The body weight variation did not exceed ±20% of the mean body weight at the start of treatment.

Animal Care and Husbandry
The 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 RMS (UK) Limited, Oxon, UK) was allowed throughout the study. The diet, drinking water and bedding were routinely analyzed and were considered not to contain any contaminants that would reasonably be expected to affect the purpose or integrity of the study.

The temperature and relative humidity were set to achieve limits of 19 to 25 °C and 30 to 70% respectively. The rate of air exchange was at least fifteen changes per hour and the lighting was controlled by a time switch to give 12 hours continuous light and 12 hours darkness.

The animals were provided with environmental enrichment items which were considered not to contain any contaminant of a level that might have affected the purpose or integrity of the study.

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
arachis oil
Details on oral exposure:
In the absence of data regarding the toxicity of the test item, 300 mg/kg was chosen as the starting dose - for a single animal.

In the absence of toxicity at a dose level of 300 mg/kg, an additional animal was treated as follows: 2000 mg/kg

In the absence of toxicity at a dose level of 2000 mg/kg, an additional group of animals was treated as follows:2000 mg.kg

Doses:
2000 mg/kg for main study
No. of animals per sex per dose:
A total of five animals were therefore treated at a dose level of 2000 mg/kg in the study.
Control animals:
no
Details on study design:
All animals were dosed once only 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 group to confirm the survival of the previously dosed animals.

Clinical observations were made 30 minutes, 1, 2, and 4 hours after dosing and then daily for 14 days. Morbidity and mortality checks were made twice daily, early and late during normal working days, and once daily at weekends and public holidays.

Individual body weights were recorded on Day 0 (the day of dosing) and on Days 7 and 14.

At the end of the observation period the animals were killed by cervical dislocation. All animals were subjected to gross necropsy. This consisted of an external examination and opening of the abdominal and thoracic cavities. The appearance of any macroscopic abnormalities was recorded. No tissues were retained.

Results and discussion

Effect levels
Key result
Sex:
female
Dose descriptor:
LD50
Effect level:
> 2 000 mg/kg bw
Based on:
test mat.
Mortality:
There was no mortality.
Clinical signs:
No signs of systemic toxicity were noted during the observation period.
Body weight:
The animal showed expected gains in body weight over the observation period.
Gross pathology:
The animal showed expected gains in body weight over the observation period.

Any other information on results incl. tables

 Dose Level -300 mg/kg

Mortality

There was no mortality.

Clinical Observations

No signs of systemic toxicity were noted during the observation period.

 Body Weight

The animal showed expected gains in body weight over the observation period.

Necropsy

No abnormalities were noted at necropsy

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Conclusions:
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 (Globally Harmonized Classification System: Unclassified).
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 test item, as asuspensioninarachis 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. There were no signs of systemic toxicity.

Body Weight. All animals showed expected gains in body weight.

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 (Globally Harmonized Classification System-Unclassified).