1-(1,1-dimethylpropylperoxy)-1-methoxycyclohexane

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:

2005

Report date:

2005

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

Deviations:

no

GLP compliance:

yes

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

1-methoxy-1-[(2-methylbutan-2-yl)peroxy]cyclohexane

EC Number:

700-446-2

Cas Number:

125768-93-6

Molecular formula:

C12H24O3

IUPAC Name:

1-methoxy-1-[(2-methylbutan-2-yl)peroxy]cyclohexane

Test animals

Species:

rat

Strain:

Wistar

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Ace Animais, Boyertown, PA
- Age at study initiation: 9-10 weeks
- Weight at study initiation: 229 - 280 g for males and 199 - 280 g for females.
- Fasting period before study: yes
- Housing: in suspended wire mesh cages; 1/cage
- Diet: Fresh PMI Rat Chow, ad libitum
- Water: ad libitum
- Acclimation period:

ENVIRONMENTAL CONDITIONS
- Temperature (°C): no data
- Humidity (%): no data
- Air changes (per hr): no data
- Photoperiod (hrs dark / hrs light): 12/12

Administration / exposure

Type of coverage:

semiocclusive

Vehicle:

unchanged (no vehicle)

Details on dermal exposure:

TEST SITE
- Area of exposure: dorsal area of the trunk
- % coverage: 4 x 6 cm
- Type of wrap if used:The torso was wrapped with plastic in a semi-occlusive manner and was secured with non-irritating tape.

REMOVAL OF TEST SUBSTANCE
- Washing (if done):Residual test article was removed by gently washing with distilled water.
- Time after start of exposure: 24 hours

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 2.08 ml/kg

Duration of exposure:

24 hours

Doses:

2000 mg/kg

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 and weighing:
Animals were observed at 1/2, 1, 2, 3 & 4 hours post-dose and once daily thereafter for 14 consecutive days for mortality, toxicity & pharmacological effects.
Body Weights were recorded immediately pretest, weekly and at death or study termination in the survivors.
The test sites were scored for dermal irritation at 24 hours postdose and on days 7 and 14.
- Necropsy of survivors performed: yes

Results and discussion

Effect levels

Key result

Sex:

male/female

Dose descriptor:

LD0

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Remarks on result:

other: no mortality

Mortality:

Ali ten animais survived the 2000 mg/kg dermal application.

Clinical signs:

Instances of chromorhinorrhea were noted during exposure and instances of alopecia on the front limbs were noted during the study.

Body weight:

Body weight changes were normal in 8/1 O animais. One female lost weight du ring the first week, but gained normally during the second week. Another female lost weight during the second week.

Gross pathology:

Necropsy results revealed abnormalities of the kidneys in 7/10 animais and alopecia was noted in 2 females.

Other findings:

Dermal effects were absent during the study.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The dermal LD0 of Luperox XPS-TP is >= 2000 mg/kg of body weight.

Executive summary:

The potential for toxicity of Luperox XPS-TP when applied dermally was evaluated following the OECD Guidelineno. 402. Five healthy male and five healthy female Wistar Albino rats were dosed dermally with Luperox XPS-TP at 2000 mg/kg of body weight. The test article was kept in contact with the skin for 24 hours. Dermal responses were recorded at 24 hours postdose and on days 7 and 14. Animals were observed for toxicity and pharmacological effects at 1, 2 and 4 hours postdose and once daily for 14 days. All animals were observed twice a day for mortality. Body weights were recorded pretest, weekly and at termination. All animals were examined for gross pathology. Abnormal tissues were preserved in 10% neutral buffered formalin for possible future histological examination. All ten animals survived the 2000 mg/kg dermal application. Instances of chromorhinorrhea were noted during exposure and instances of alopecia on the front limbs were noted during the study. Dermal effects were absent during the study. Body weight changes were normal in 8/10 animals. One female lost weight during the first week, but gained normally during the second week. Another female lost weight during the second week. Necropsy results revealed abnormalities of the kidneys in 7/10 animals and alopecia was noted in 2 females. The dermal LD0 of Luperox XPS-TP is higher than 2000 mg/kg of body weight.