Etocrilene

Acute Toxicity: dermal

Administrative data

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

key study

Study period:

16-NOV-2006 - 07-DEC-2006

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference 1

Reference Type:

study report

Title:

Unnamed

Year:

2007

Report date:

2007

Reference 2

Reference Type:

study report

Title:

Unnamed

Year:

2007

Report date:

2007

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

Test guideline 2

Qualifier:

according to guideline

Guideline:

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

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.1200 (Acute Dermal Toxicity)

GLP compliance:

yes (incl. QA statement)

Remarks:

RCC Ltd.

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Etocrilene

EC Number:

226-029-0

EC Name:

Etocrilene

Cas Number:

5232-99-5

Molecular formula:

C18H15NO2

IUPAC Name:

ethyl 2-cyano-3,3-diphenylprop-2-enoate

Details on test material:

- Physical state: white solid
- Stability under test conditions: stable
- Storage condition of test material: At room temperature (range of 20 +/- 5 °C), light protected

Test animals

Species:

rat

Strain:

other: HanRcc:WIST (SPF)

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: RCC Ltd, Laboratory/ Animal Services, CH-4414 Füllinsdorf, Switzerland
- Age at study initiation: Males: 8 weeks, Females: 11 weeks
- Housing: IndividualIy in Makrolon type-3 cages with standard softwood bedding ("Lignocel" Schill AG, CH-4132 Muttenz)
- Diet: Pelleted standard Provimi Kliba 3433 rat/mouse maintenance diet, batch no. 48/06 (Provimi Kliba AG, CH-4303 Kaiseraugst/Switzerland) ad Iibitum.
- Water: ad libitum
- Acclimation period: 6 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 +/- 3
- Humidity (%): 30 - 70
- Air changes (per hr): 10- 15
- Photoperiod (hrs dark / hrs light): 12 / 12

Administration / exposure

Type of coverage:

semiocclusive

Vehicle:

polyethylene glycol

Remarks:

300

Details on dermal exposure:

TEST SITE
- % coverage: 10
- Type of wrap if used: semi-occlusive dressing wrapped around the abdomen and fixed with an elastic adhesive bandage.

REMOVAL OF TEST SUBSTANCE
- Washing (if done): flushed with lukewarm tap water and dried with disposable paper towels.
- Time after start of exposure: 24 h

TEST MATERIAL
- Amount applied: 2 g/kg
- Concentration (if solution): 0.5 g/mL
- Constant concentration used: yes

VEHICLE
- Amount applied: 4 mL/kg
- Lot/batch no.: 130022563006152

Duration of exposure:

24 h

Doses:

2000 mg/kg bodyweight

No. of animals per sex per dose:

5

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations: at approximately 30 minutes, 1, 2, 3 and 5 hours after treatment on day 1 and once daily during test days 2-15.
- Frequency of weighing: on day 1 (prior to administration) and on days 8 and 15.
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight, viability, local signs

Statistics:

No statistical analysis was used.

Results and discussion

Effect levels

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Mortality:

No deaths occurred during the study.

Clinical signs:

other: No systemic or local signs of toxicity were observed during the course of the study.

Gross pathology:

No macroscopic findings were recorded at the scheduled necropsy.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The median lethal dose of the test article after single dermal administration to rats of both sexes is greater than 2000 mg/kg body weight.

Executive summary:

In a GLP-compliant dermal toxicity study following OECD testing guideline 402, five male and five female HanRcc:WIST (SPF) rats were treated with the test substance at 2000 mg/kg by dermal application. The test item was diluted in the vehicle (PEG 300) at a concentration of 0.5 g/mL and administered at a volume of 4 mL/kg for 24 hours. The animals were examined daily during the acclimatization period and mortality, viability and clinical signs were recorded. All animals were examined for clinical signs at approximately 30 minutes, 1, 2, 3 and 5 hours after treatment on day 1 and once daily during test days 2-15. Local signs were noted once daily from test day 2 to 15. Mortality/viability was recorded at approximately 30 minutes, 1, 2, 3 and 5 hours after administration on test day 1 (with the clinical signs) and twice daily during days 2-15. Body weights were recorded on day 1 (prior to administration) and on days 8 and 15. All animals were necropsied and examined macroscopically. No deaths occurred during the study. No systemic or local signs of toxicity were observed during the course of the study. The body weight was within the range commonly recorded for this strain and age. No macroscopic findings were recorded at the scheduled necropsy. Therefore, the median lethal dose of the test substance after single dermal administration to rats of both sexes, observed over a period of 14 days is greater than 2000 mg/kg body weight.