4-hydroxy-2,2,6,6-tetramethylpiperidinoxyl

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:

other: The study is regarded as reliable without restrictions because it was conducted in compliance with GLP regulation and guideline. The study is scientifically well documented and complete in any parts.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2012

Report date:

2012

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

year of guideline 2008

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

Version / remarks:

Adopted 1987-02-24

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.1200 (Acute Dermal Toxicity)

Version / remarks:

Adopted 1998-08

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

4-hydroxy-2,2,6,6-tetramethylpiperidinoxyl

EC Number:

218-760-9

EC Name:

4-hydroxy-2,2,6,6-tetramethylpiperidinoxyl

Cas Number:

2226-96-2

Molecular formula:

C9H18NO2•

IUPAC Name:

1-λ1-Oxidanyl-2,2,6,6-tetramethylpiperidin-4-ol

Test material form:

other: solid

Test animals

Species:

rat

Strain:

other: CD / Crl: CD (SD)

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River Laboratories Research Models and Services, Germany GmbH, Sandhofer Weg 7, 97633 Sulzfeld, Germany
- Age at study initiation: Males : approx. 8 weeks Females : approx. 9 weeks
- Weight at study initiation: Males 201-219 g Females : 208-222 g
- Housing: MAKROLON cages (type III plus)
Granulated textured wood was used as bedding material for the cages. The cages were changed and cleaned twice a week.
- Diet: Commercial diet, ssniff® R/M-H V1534 served as food. Feeding was discontinued approx. 16 hours before administration
- Water: only tap water was then available ad libitum.
- Acclimation period: 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): room temperature of 22°C ± 3°C (maximum range)
- Humidity (%): 55% ± 15% (maximum range)
- Photoperiod (hrs dark / hrs light): The rooms were lit (150 lux at approx. 1.50 m room height) and darkened for periods of 12 hours each.

Administration / exposure

Type of coverage:

occlusive

Vehicle:

water

Details on dermal exposure:

TEST SITE
- Area of exposure: 5cm x 6cm approx. 1/10 of body surface
- % coverage: 10
- Type of wrap if used: The test item was held in contact with the skin with 8 layers of gauze. The gauze was covered with a plastic sheet and secured with adhesive plaster strips on the application site for 24 hours.


TEST MATERIAL
- Amount applied: 2000 mg/kg bw

Duration of exposure:

24 hours

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

5 male and 5 female animals were used

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days

- Frequency of observations and weighing: Observations were performed before and immediately, 5, 15, 30 and 60 min, as well as 3, 6 and 24 hours after administration. All animals were observed for a period of 14 days.

- Other examinations performed: During the follow-up period (two weeks), changes of skin and fur, eyes and mucous membranes, respiratory and circulatory function, autonomic and central nervous system and somatomotor activity as well as behaviour pattern, were observed at least once a day until all symptoms subsided, thereafter each working day. Attention was also paid to possible tremors, convulsions, salivation, diarrhoea, lethargy, sleep and coma. At the end of the experiments, all animals were sacrificed, dissected and inspected macroscopically. All gross pathological changes were recorded. No histopathology was carried out as no macroscopical findings were noted at necropsy.

Results and discussion

Effect levels

Effect levels 1

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Effect levels 2

Sex:

male/female

Dose descriptor:

LD0

Effect level:

2 000 mg/kg bw

Based on:

test mat.

Mortality:

No mortality was observed.

Clinical signs:

other: No adverse clinicals signs were observed.

Gross pathology:

Not performed as all animals survived.

Applicant's summary and conclusion

Interpretation of results:

study cannot be used for classification

Conclusions:

The LD50 value for the test item 4 Hydroxy-TEMPO was determined to be > 2000 mg/kg bw.