N-[(1,1,3,3-tetramethylbutyl)phenyl]naphthalen-1-amine

Acute Toxicity: dermal

Administrative data

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

key study

Study period:

February 10, 2012 - March 03, 2012

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2013

Report date:

2013

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:

EPA OPPTS 870.1200 (Acute Dermal Toxicity)

Test guideline 3

Qualifier:

according to guideline

Guideline:

other: Commission Regulation (EC) No 440/2008

Test guideline 4

Qualifier:

according to guideline

Guideline:

other: Japan MAFF 8147

GLP compliance:

yes (incl. QA statement)

Remarks:

Bioassay, Labor für biologische Analytik GmbH, 69120 Heidelberg

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

N-[(1,1,3,3-tetramethylbutyl)phenyl]naphthalen-1-amine

EC Number:

257-406-8

EC Name:

N-[(1,1,3,3-tetramethylbutyl)phenyl]naphthalen-1-amine

Cas Number:

51772-35-1

Molecular formula:

C24H29N

IUPAC Name:

N-[(1,1,3,3-tetramethylbutyl)phenyl]naphthalen-1-amine

Details on test material:

- Physical state: solid/white
- Analytical purity: 99.0 g/100 g determined by 1H-MR spectroscopy
- Expiration date of the lot/batch: July 15, 2015
- Storage condition of test material: Room temperature; avoid temperatures > 35°C

Test animals

Species:

rat

Strain:

Wistar

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River Wiga GmbH, Sandhofer Weg 7, 97633 Sulzfeld, Germany
- Age at study initiation: male animals approx. 8 weeks, female animals approx. 12 weeks
- Weight at study initiation: approx. 230 g (males) and approx. 200 g (females)
- Fasting period before study: Feed was withdrawn from the animals at least 16 hours before administration, but water was available ad libitum
- Housing: Single housing in Makrolon cages, type III
- Diet: VRF1(P); SDS Special Diets Services, 67122 Altrip, Germany)
- Water: Tap water ad libitum
- Acclimation period: at least 5 days

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

Administration / exposure

Type of coverage:

semiocclusive

Vehicle:

olive oil

Remarks:

Ph.Eur

Details on dermal exposure:

TEST SITE
- Area of exposure: dorsal and dorso-lateral parts of the trunk
- % coverage: at least 10 % of total body surface area
- Type of wrap if used: The test item was covered with an air-permeable dressing (4 layers of absorbent gauze (Ph. Eur. supplied by Lohmann GmbH & Co., KG) and stretch bandage (Fixomull® Stretch (adhesive fleece) supplied by Beiersdorf AG).

REMOVAL OF TEST SUBSTANCE
- Washing (if done): yes, with warm water
- Time after start of exposure: 24 h

VEHICLE
- Amount(s) applied (volume or weight with unit): 3.33 ml/kg body weight

Duration of exposure:

24 h

Doses:

2000 mg/kg body weight

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: A check for any dead or moribund animals was made at least once each workday, these records are archived by Bioassay. Individual body weights were determined shortly before administration (day 0), weekly thereafter and on the last day of observation. Recording of clinical signs several times on the day of administration, and at least once daily thereafter each workday for the individual animals.
- Necropsy of survivors performed: yes
- Other examinations performed: Scoring of skin findings: Individual readings 30 – 60 minutes after removal of the semi-occlusive dressing (day 1), weekly thereafter and on the last day of observation. The evaluation of skin reactions was performed according to Draize, J.H. (1959).

Results and discussion

Effect levels

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

No mortality occurred.

Clinical signs:

other: No systemic clinical signs were observed during clinical examination. No local effects were observed.

Gross pathology:

No macroscopic pathologic abnormalities were noted in the animals (5 males and 5 females) examined on the last day of observation.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

Under the conditions of this study the median lethal dose (LD50) of the test article after dermal application was found to be greater than 2000 mg/kg bw in male and female rats.

Executive summary:

In a GLP-compliant acute dermal toxicity study (Limit Test) following OECD guideline 402, young adult Wistar rats (5 males and 5 females) were dermally exposed to a single dose of 2000 mg/kg bw of the test article (as suspension in olive oil Ph.Eur) to the clipped skin (dorsal and dorso-lateral parts of the trunk) and covered by semi-occlusive dressing for 24 hours. The application area comprised at least 10% of the total body surface area. The animals were observed for 14 days. No mortality occurred. No signs of systemic toxicity or skin effects and no macroscopic pathologic abnormalities were noted in the animals examined at the end of the study. The mean body weight of the female animals did not adequately increase during the first post-exposure observation week, probably due to the bandage procedure, but increased during the second week within the normal range. The mean body weight of the male animals increased within the normal range throughout the study period, with the exception of one male which showed stagnation of body weight during the second week. Accordingly, the acute dermal median lethal dose (LD50) in rats was determined to be greater than 2000 mg/kg bw.