2-[(4-chloro-2-nitrophenyl)azo]-N-(2-methoxyphenyl)-3-oxobutyramide

Endpoint summary

Description of key information

Ten female Wistar-rats were subjected to test acute oral toxicity. The test substance was administered by gavage at a dose of 5000 mg/kg bw.

No clinical signs of toxicity were observed. Faeces were yellow-coloured in all animals. Body weight development was not impaired. Animals killed at the end of the observation period showed no macroscopically visible changes. No animal died during the 14 day observation period, resulting in a LD50 > 5000 mg/kg bw.

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

Key value for chemical safety assessment

Acute toxicity: via oral route

Link to relevant study records

Reference

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From 30 NOV 1977 to 20 DEC 1977

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: basic data given, comparable to guideline

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 401 (Acute Oral Toxicity)

Deviations:

not applicable

GLP compliance:

no

Remarks:

study was performed previous to GLP implementation

Test type:

standard acute method

Limit test:

yes

Species:

rat

Strain:

Wistar

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Strain: Hoe: WISKf (SPF 71), SPF breeding colony
- Weight at study initiation: mean 182 g
- Fasting period before study: 16 h
- Housing: plastic cages
- Diet: Altromin 1324 (Altromin GmbH, Lage/Lippe, Germany) ad libitum
- Water: tap water ad libitum

Route of administration:

oral: gavage

Vehicle:

other: sesame oil

Details on oral exposure:

VEHICLE
- Concentration in vehicle: 25% suspension in vehicle

Doses:

5000 mg/kg bw

No. of animals per sex per dose:

10 females

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of weighing: weekly
- Necropsy of survivors performed: yes

Key result

Sex:

female

Dose descriptor:

LD50

Effect level:

> 5 000 mg/kg bw

Based on:

test mat.

Remarks on result:

other: no animal died within the observation period

Mortality:

- no deaths occurred

Clinical signs:

other: - no clinical signs of toxicity were observed - faeces were yellow-coloured in all animals

Gross pathology:

- animals killed at the end of the observation period showed no macroscopically visible changes

Interpretation of results:

not classified

Remarks:

Criteria used for interpretation of results: EU

Conclusions:

Single application of 5000 mg test substance per kg bw did not cause lethality in female Wistar-rats during the 14 day observation period, resulting in a LD50 > 5000 mg/kg bw.

Executive summary:

Ten female Wistar-rats were subjected to test acute oral toxicity. The test substance was administered by gavage at a dose of 5000 mg/kg bw.

No clinical signs of toxicity were observed. Faeces were yellow-coloured in all animals. Body weight development was not impaired. Animals killed at the end of the observation period showed no macroscopically visible changes. No animal died during the 14 day observation period, resulting in a LD50 > 5000 mg/kg bw.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

LD0

Value:

5 000 mg/kg bw

Quality of whole database:

reliable

Acute toxicity: via inhalation route

Endpoint conclusion

Endpoint conclusion:

no study available

Acute toxicity: via dermal route

Link to relevant study records

Reference

Reference 1

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From 07 DEC 2011 to 21 DEC 2011

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Guideline study (OECD 402) and according to GLP.

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method B.3 (Acute Toxicity (Dermal))

Deviations:

no

GLP compliance:

yes

Test type:

standard acute method

Limit test:

yes

Species:

rat

Strain:

Wistar

Sex:

male/female

Details on test animals or test system and environmental conditions:

Five male and five female Wistar (RccHan:WIST) strain rats.
On receipt the animals were randomly allocated to cages. The females were nulliparous and non pregnant. After an acclimatisation 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 weighed at least 200g, and were eight to twelve weeks of age. The weight variation did not exceed ±20% of the mean weight for each sex.

The animals were housed in suspended solid floor polypropylene cages furnished with woodflakes. The animals were housed individually during the 24 Hour exposure period and in groups of five, by sex, for the remainder of the study. Free access to mains drinking water and food was allowed throughout the study. The diet, drinking water and bedding were routinely analysed and were considered not to contain any contaminants that could 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. Any occasional deviations from these targets were considered not to have affected the purpose or integrity of the study. 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.

Type of coverage:

semiocclusive

Vehicle:

arachis oil

Details on dermal exposure:

The appropriate amount of test item, mixed with arachis oil BP, was applied as evenly as possible to an area of shaved skin (approximately 10% of the total body surface area).

Duration of exposure:

24 hours

Doses:

2000 mg/kg body weight

No. of animals per sex per dose:

5 Male
5 Female

Control animals:

not required

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of weighing: weekly
- Frequency of observations: first day: 4 times, thereafter once daily
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, dermal reactions

Statistics:

No statistical analysis was performed.

Key result

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Remarks on result:

other: no animal died within the observation period

Mortality:

There were no deaths.

Clinical signs:

other: There were no signs of systemic toxicity.

Gross pathology:

No abnormalities were noted at necropsy.

Other findings:

Dermal Reactions

Yellow coloured staining was noted at the test sites of all animals during the study. The staining prevented accurate evaluation of erythema in all animals one day after dosing.
Very slight erythema was noted at the test site of one female five to eight days after dosing. Crust formation and small superficial scattered scabs were also noted at this site. There were no signs of dermal irritation noted in the remaining animals.

Interpretation of results:

not classified

Remarks:

Criteria used for interpretation of results: EU

Conclusions:

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

Executive summary:

Introduction.  The study was performed to assess the acute dermal toxicity of the test item in the Wistar strain rat. The method was designed to be compatible with the following:

OECD Guidelines for the Testing of Chemicals No. 402 “Acute Dermal Toxicity” (adopted 24 February 1987)

Method B3 Acute Toxicity (Dermal) of CommissionRegulation (EC) No. 440/2008

Method.

A group of ten animals (five males and five females) was given a single, 24 hour, semi-occluded dermal application of the test item to intact skin 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.

 

Mortality. 

There were no deaths.

 

Clinical Observations. 

There were no signs of systemic toxicity.

 

Dermal Irritation. 

Very slight erythema was noted at the test site of one female. Crust formation and small superficial scattered scabs were also noted at this site. No other signs of dermal irritation were noted. 

 

Body weight. 

Animals showed expected gains in body weight over the study period except for one female which showed expected gain in body weight during the first week but slight body weight loss during the second week.

 

Necropsy. 

No abnormalities were noted at necropsy.

 

Conclusion.

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

Reference 2

Endpoint:

acute toxicity: dermal

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Justification for type of information:

For details on endpoint specific justification please see read-across report in section 13 or find a link in cross-reference “assessment report”.

Reason / purpose for cross-reference:

read-across source

Reason / purpose for cross-reference:

assessment report

Key result

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Remarks on result:

other: no animal died within the observation period

Remarks:

The reported value refers to the source substance and was not converted to the target substance since (a) no adverse effects were observed and (b) the difference of the molecular weights of the target and the source substance is small (less than 20%).

Interpretation of results:

not classified

Remarks:

Criteria used for interpretation of results: EU

Conclusions:

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

Executive summary:

The study used as source investigated C.I. Pigment Yellow 1. The study results of the source compound were considered applicable to the target compound and were used for classification and labelling acc. to REGULATION (EC) No 1272/2008. Justification and applicability of the read-across approach (structural analogue) is outlined in the read-across report in section 13 or find a link in cross reference “assessment report”.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

LD50

Value:

> 2 000 mg/kg bw

Justification for classification or non-classification

No classification

No adverse effects were observed after acute oral or dermal exposure.