3-anilino-5-methyl-5-(4-phenoxyphenyl)-1,3-oxazolidine-2,4-dione;famoxadone (ISO)

Acute Toxicity: dermal

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

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2016

Report date:

2016

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.1200 (Acute Dermal Toxicity)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

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

Deviations:

no

Test guideline 4

Qualifier:

according to guideline

Guideline:

other: MAFF Japan Test Guidelines for Agricultural Chemicals 12-Nousan-8147 (2000)

Deviations:

no

GLP compliance:

yes

Test type:

standard acute method

Test material

Test material information

Constituent 1

Reference substance name:

5-methyl-5-(4-phenoxyphenyl)-3-(phenylamino)-1,3-oxazolidine-2,4-dione

EC Number:

603-520-1

Cas Number:

131807-57-3

Molecular formula:

C22H18N2O4

IUPAC Name:

5-methyl-5-(4-phenoxyphenyl)-3-(phenylamino)-1,3-oxazolidine-2,4-dione

Test material form:

solid

Specific details on test material used for the study:

Substance ID: DPX-JE874-498
Lot #: JEGX150811
Purity: 98.8%

Test animals

Species:

rat

Strain:

other: Crl:CD(SD)

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River Laboratories International, Inc., Raleigh, North Carolina, U.S.A.
- Females nulliparous and non-pregnant: Yes
- Rationale for use of males: Not specified
- Age at study initiation: Approximately 10 weeks old
- Weight at study initiation: 222.4-325.4 g
- Housing: Animals were housed individually in solid-bottom caging with bedding and appropriate species-specific enrichment.
- Diet: ad libitum
- Water: ad libitum
- Acclimation period: 6 days

ENVIRONMENTAL CONDITIONS
- Temperature: 20-26ºC
- Humidity: 30-70%
- Photoperiod: 12-hour light/dark cycle

Administration / exposure

Type of coverage:

semiocclusive

Vehicle:

other: deionized water

Details on dermal exposure:

TEST SITE
- Area of exposure: approximately 5 cm x 7.4 cm
- Coverage: 10%
- Type of wrap if used: Semi occlusive (the test substance was covered with a 2-ply gauze patch. The rats were then wrapped with stretch gauze bandage and self-adhesive bandage)

REMOVAL OF TEST SUBSTANCE
- Washing: Excess test substance was washed from the dorsal skin of each rat with paper towels soaked in soap and warm water, and the skin was dried.
- Time after start of exposure: 24 hours

TEST MATERIAL
- For solids, paste formed: yes

Duration of exposure:

24 h

Doses:

5000 mg/kg

No. of animals per sex per dose:

05

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Daily animal health observations were conducted throughout the study for mortality and signs of illness, injury, and abnormal behavior. The rats were weighed on test days 1, 8, and 15, and were observed daily for clinical signs of toxicity and dermal irritation (weekends and holidays excluded for dermal irritation)
- Necropsy of survivors performed: yes

Results and discussion

Effect levels

Key result

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 5 000 mg/kg bw

Based on:

test mat.

Mortality:

There were no incidents of mortality

Clinical signs:

other: There were no clinical abnormalities, and no signs of skin irritation.

Gross pathology:

No gross lesions were present in the rats at necropsy.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

Dermal LD50 (Rat): >5000 mg/kg

Executive summary:

The test substance was evaluated for dermal toxicity according to the guidelines OECD 402 and EPA

OPPTS 870.1200.

A single dose of the test substance was applied to the shaved, intact skin of 5 male and 5 female rats at a dose level of 5000 mg/kg of body weight. The application site was covered with a semi-occlusive dressing for 24 hours, after which the test substance was removed. The rats were observed for 14 days following application. The rats were necropsied to detect grossly observable evidence of organ or tissue damage at the end of the 15-day test period.

There were no incidents of mortality, no overall body weight losses, no clinical abnormalities and no signs of skin irritation.

No gross lesions were present in the rats at necropsy.

Under the conditions of this study, the dermal LD50 for the test substance was greater than 5000 mg/kg of body weight when applied to the skin of male and female rats for 24 hours.