4,4'-ethylenedianiline

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2015

Report date:

2015

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

Test guideline 4

Qualifier:

according to guideline

Guideline:

other: Japanese Ministry of Agriculture, Forestry and Fisheries (JMAFF), Testing Guidelines for Toxicology Studies, 12 NohSan No. 8147, amended 10 December 2002

Deviations:

no

GLP compliance:

yes

Test type:

acute toxic class method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

4,4'-ethylenedianiline

EC Number:

210-716-7

EC Name:

4,4'-ethylenedianiline

Cas Number:

621-95-4

Molecular formula:

C14H16N2

IUPAC Name:

4-[2-(4-aminophenyl)ethyl]aniline

Test animals

Species:

rat

Strain:

Wistar

Sex:

female

Details on test animals or test system and environmental conditions:

Female Wistar (RccHan™:WIST) strain rats were supplied by Harlan Laboratories UK Ltd., 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 five 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 eight to twelve weeks of age. The body weight variation did not exceed ±20% of the mean body weight of the initially dosed group.

The animals were housed in groups of three in suspended solid floor polypropylene cages furnished with woodflakes. With the exception of an overnight fast immediately before dosing and for approximately three to four hours after dosing, free access to mains drinking water and food (2014C Teklad Global Rodent diet supplied by Harlan Laboratories UK Ltd., 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 twelve hours continuous light (06:00 to 18:00) and twelve 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:

Animals were dosed once only by gavage

Doses:

2000 mg/kg

No. of animals per sex per dose:

3 females (2000 mg/kg)
3 females (2000 mg/kg)

Control animals:

no

Details on study design:

Using available information on the toxicity of the test item, 2000 mg/kg was chosen as the starting dose.

Groups of fasted animals were treated as follows:

Dose Level(mg/kg / Concentration(mg/mL) / Dose Volume(mL/kg) / Number of Rats (Female)
2000 / 200 / 10 / 3
2000 / 200 / 10 / 3

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 group to confirm the survival of the previously dosed animals.

The animals were observed for deaths or overt signs of toxicity ½, 1, 2 and 4 hours after dosing and subsequently once daily for up to fourteen days.

Individual body weights were recorded prior to dosing and seven and fourteen days after treatment or at death.

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

Statistics:

None recorded.

Results and discussion

Effect levels

Sex:

female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Remarks on result:

other: 95% confidence limits not reported

Mortality:

One animal was killed for humane reasons, 9 days after dosing, due to the occurrence of clinical signs of toxicity that exceeded the severity limit set forth in the UK Home Office Project Licence.

Clinical signs:

other: Signs of systemic toxicity noted were hunched posture, exophthalmos, labored respiration, tiptoe gait, cyanosis, ataxia, dehydration, pallor of the extremities and pilo erection.

Gross pathology:

Patchy pallor of the liver was noted at necropsy of the animal that was humanely killed during the study. No abnormalities were noted at necropsy of animals that were killed at the end of the study.

Applicant's summary and conclusion

Interpretation of results:

not classified

Remarks:

Migrated information Criteria used for interpretation of results: EU

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 - Category 5, >2000 – 5000 mg/kg body weight). The LD50 cut-off was determined to be 2500 mg/kg body weight.

According to the findings in this study DABY, trocken does not meet the criteria for classification according to Regulation (EC) No. 1272/2008 of the European Parliament and of the Council of 16 December 2008.

Executive summary:

Introduction

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

 

Methods

A group of three fasted females was treated with the test item at a dose level of 2000 mg/kg body weight. This was followed by a further group of three fasted females at the same dose level. Dosing was performed sequentially.

 

The test item was administered orally as a suspension in arachis oil BP. Clinical signs and body weight development were monitored during the study. All animals were subjected to gross necropsy.

 

Results

Mortality. One animal was killed for humane reasons, 9 days after dosing, due to the occurrence of clinical signs of toxicity that exceeded the severity limit set forth in the UK Home Office Project Licence.

 

Clinical Observations. Signs of systemic toxicity noted were hunched posture, exophthalmos, labored respiration, tiptoe gait, cyanosis, ataxia, dehydration, pallor of the extremities and pilo-erection. 

 

Body Weight. Surviving animals showed expected gains in body weight over the observation period except for one animal which showed body weight loss during the first week with expected gain in body weight during the second week.

 

Necropsy. Patchy pallor of the liver was noted at necropsy of the animal that was humanely killed during the study. No abnormalities were noted at necropsy of animals that were killed at the end of the study.

 

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 -Category 5, >2000 – 5000 mg/kg body weight). The LD50 cut-off was determined to be 2500 mg/kg body weight.

 

According to the findings in this study DABY, trocken does not meet the criteria for classification according to Regulation (EC) No. 1272/2008 of the European Parliament and of the Council of 16 December 2008.