Reaction mass of Benzenepropanal, 4-ethyl-α,α-dimethyl- and 3-(2-ethylphenyl)-2,2-dimethylpropanal

Acute Toxicity: dermal

Administrative data

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

key study

Study period:

6 Aug 1980 to 30 Sep 1980

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1980

Report date:

1980

Materials and methods

Test guideline

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

GLP compliance:

yes

Test type:

fixed dose procedure

Limit test:

yes

Test material

Test material information

1

Reference substance name:

Reaction mass of Benzenepropanal, 4-​ethyl-​α,​α-​dimethyl- and 3-(2-ethylphenyl)-2,2-dimethylpropanal

EC Number:

916-329-6

Molecular formula:

C13H18O

IUPAC Name:

Reaction mass of Benzenepropanal, 4-​ethyl-​α,​α-​dimethyl- and 3-(2-ethylphenyl)-2,2-dimethylpropanal

Test material form:

liquid

Details on test material:

As described in 1.2 of dossier

Test animals

Species:

rabbit

Strain:

New Zealand White

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Perfection Breeders, Nicholas Helf
- Age at study initiation: 8 weeks
- Weight at study initiation: 2.0 – 2.8 kg
- Housing: animals were housed 2 animals per cage in suspended wire mesh cages
- Diet: fresh Purina rabbit chow, ad libitum
- Water: ad libitum
- Acclimation period: at least one week

Administration / exposure

Type of coverage:

occlusive

Vehicle:

unchanged (no vehicle)

Details on dermal exposure:

TEST SITE
- Area of exposure: immediately prior to dosing, the fur was clipped from the abdomen. Abrasions were made in ½ of the rabbits. The abrasions, extending the length of the exposure site, scratched the stratum corneum but did not reach the derma or produce bleeding. The test material was applied once to the prepared site under gauze patches.
- % coverage: The clipped area was 200 cm2, approximately 10% of the body surface.
- Type of wrap if used: Patches were secured with adhesive tape and the trunks were wrapped with impervious material.

REMOVAL OF TEST SUBSTANCE
- Washing: the exposure site was wiped, but not washed
- Time after start of exposure: 24 hours

TEST MATERIAL
- Amount(s) applied: 5000 mg/kg bw

Duration of exposure:

24 hours

Doses:

5000 mg/kg bw

No. of animals per sex per dose:

6 males and 4 females

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations: Dermal reactions were scored at 1, 7 and 14 days after exposure. Animals were observed daily for signs of toxicity, pharmacological effects and mortality.
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight

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:

No mortality was observed.

Clinical signs:

other: Animals were in generally good health.

Gross pathology:

Internal organs, on superficial examination, appeared normal.

Other findings:

Skin reactions were generally slight on days 1 and 7 and generally cleared by day 14. One animal had severe edema on day 1 and crusted skin at necropsy on day 14. Scaly skin was observed in 6 out of 10 animals at necropsy.

Applicant's summary and conclusion

Interpretation of results:

other: Not acute harmful

Remarks:

in accordance with EU CLP (EC 1272/2008 and its updates)

Conclusions:

The acute dermal toxicity test showed an LD50 > 5000 mg/kg bw

Executive summary:

In a GLP compliant study, similar to OECD TG 402, ten New Zealand White rabbits were exposed to the test substance via dermal application. Six males and four females were exposed to 5000 mg/kg bw. After an observation period of 14 days animals were necropsied. All animals survived the study in generally good health. Changes in body weights were generally normal. Internal organs, on superficial examination, appeared normal.Skin reactions were generally slight on days 1 and 7 and generally cleared by day 14. One animal had severe edema on day 1 and crusted skin at necropsy on day 14. Scaly skin was observed in 6 out of 10 animals at necropsy. The LD50 was determined to be higher than 5000 mg/kg bw.