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Toxicological information

Acute Toxicity: dermal

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Administrative data

Endpoint:
acute toxicity: dermal
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study conducted to GLP and in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not effect the quality of the relevant results.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2000

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 402 (Acute Dermal Toxicity)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method B.3 (Acute Toxicity (Dermal))
Deviations:
no
GLP compliance:
yes (incl. certificate)
Test type:
standard acute method
Limit test:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: crystalline

Test animals

Species:
rat
Strain:
Sprague-Dawley
Sex:
male/female
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: Five male and five femake Sprague Dawley CD (Crl : CD (SD) IGS BR) strain rats were supplied by Charles River UK Ltd., Margate, Kent.
- Age at study initiation: Eight to twelve weeks of age
- Weight at study initiation: 207 - 242g males and 209 - 230g females.
- Fasting period before study: None.
- Housing: 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.
- Diet (e.g. ad libitum): Free access to food (Rat and Mouse Expanded Diet No.1, Special Diets Services Limited, Witham Essex, UK) was allowed throughout the study.
- Water (e.g. ad libitum): Free access to mains drinking water was allowed throughout the study.
- Acclimation period: At least five days.

ENVIRONMENTAL CONDITIONS
- Temperature (°C): Set to achieve limits of 19 to 25°C
- Humidity (%): Set to achieve limits of 30 to 70%
- Air changes (per hr): At least fifteen changes per hour
- Photoperiod (hrs dark / hrs light): lighting was controlled by a time switch to give twelve hours continuous light (06:00 to 18:00) and twelve hours darkness.

Administration / exposure

Type of coverage:
semiocclusive
Vehicle:
other: The test material was moistened with dried arachis oil
Details on dermal exposure:
PROCEDURE:
On the day before treatment the back and flanks of each animal were clipped free of hair.

A group of 5 males and 5 females was treated with the test material at a dose level of 2000 mg/kg.

The appropriate amount of test material moistened with dried arachis oil BP was applied uniformly to an area of shorn skin (approximately 10% of the total body surface area). A piece of surgical gauze was placed over the treatment area and semi-occluded with a piece of self-adhesive bandage. The animals were caged individually for the 24-Hour exposure period. Shortly after dosing the dressings were examined to ensure that they were securely in place.

REMOVAL OF TEST SUBSTANCE:
After the 24-Hour contact period the bandage was carefully removed and the treated skin and surrounding hair wiped with cotton wool moistened with dried arachis oil BP to remove any residual test item. The animals were returned to group housing for the remainder of the study period.




Duration of exposure:
24 hours
Doses:
2000 mg/kg body weight
No. of animals per sex per dose:
5 male and 5 female at 2000 mg/kg
Control animals:
no
Details on study design:
- Duration of observation period following administration: 14 days

- Frequency of observations and weighing:
The animals were observed for deaths or overt signs of toxicity ½, 1, 2 and 4 hours after dosing and subsequently once daily for fourteen days.

After removal of the dressings and subsequently once daily for fourteen days, the test sites were examined for evidence of primary irritation and scored according to the Draize scale (see evaluation of skin reactions).

Any other skin reactions, if present were also recorded.

Individual bodyweights were recorded prior to application of the test item on Day 0 and on Days 7 and 14.

- Necropsy of survivors performed: yes
At the end of the study 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:
male/female
Dose descriptor:
LD50
Effect level:
> 2 000 mg/kg bw
Based on:
test mat.
Mortality:
Individual mortality data are given in the attached background material.
There were no deaths.
Clinical signs:
Individual clinical observations are given in the attached background material.
No clinical signe of toxicity were noted during the study.

Body weight:
Individual bodyweights and weekly bodyweight changes are given in the attached background material.
All animals showed expected gains in bodyweight over the study period.
Gross pathology:
Individual necropsy findings are given in the attached background material.
No abnormalities were noted at necropsy.
Other findings:
Dermal Reactions:
Individual dermal reactions are given in the attached background material.
No signs of dermal irritation were noted during the study.

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Conclusions:
The acute dermal median lethal dose (LD50) of the test item in the Sprague Dawley strain rat was found to be >2000 mg/kg bodyweight.
Executive summary:

Introduction.

The study was performed to assess the acute dermal toxicity of the test item in the Sprague Dawley 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 Commission Directive 92/69/EEC

Method.

A group of ten animals (five males and five females) was given a single, 24 hour, semi-occluded dermal application of the undiluted test item to intact skin at a dose level of 2000 mg/kg bodyweight. The animals were observed for 14 days, clinical signs and bodyweight development were monitored during the study. All animals were subjected to gross necropsy.

Mortality.

There were no deaths at 2000 mg/kg.

Clinical Observations.

There were no signs of systemic toxicity or dermal irritation

Bodyweight.

All animals showed expected gains in bodyweight over the study period.

Necropsy.

No abnormalities were noted at necropsy.

Conclusion.

The acute dermal median lethal dose (LD50) of the test item in the Sprague Dawley CD strain rat was found to be >2000 mg/kg bodyweight and therefore did not meet the criteria for classification according to the Classification, Labelling and Packaging Regulation (CLP) .