Reaction mass of (2R*,4R*,4aR*,9bS*)-2,4-dimethyl-4,4a,5,9b-tetrahydroindeno[1,2-d][1,3]dioxine and (2R*,4R*,4aS*,9bR*)-2,4-dimethyl-4,4a,5,9b-tetrahydroindeno[1,2-d][1,3]dioxine

Acute Toxicity: dermal

Administrative data

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

key study

Study period:

01 - 15 Mar 2001

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP-Guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2001

Report date:

2001

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

Version / remarks:

adopted 24 February 1987

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

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

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

The Department of Health of the Government of the United Kingdom

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

2,4-dimethyl-2H,4H,4aH,5H,9bH-indeno[1,2-d][1,3]dioxine

EC Number:

944-528-8

Molecular formula:

C13H16O2

IUPAC Name:

2,4-dimethyl-2H,4H,4aH,5H,9bH-indeno[1,2-d][1,3]dioxine

Test animals

Species:

rat

Strain:

Sprague-Dawley

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Age at study initiation: 8 weeks
- Weight at study initiation: males: 231 - 245 g; females: 201 - 228 g
- Housing: individually during the 24-hour exposure period and in groups of 5, by sex, for the remainder of the study
- Diet: Rat and Mouse Expanded Diet No. 1 (Special Diets Services Limited, Witham, UK), ad libitum
- Water: mains drinking water, ad libitum
- Acclimation period: minimum 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19 - 25
- Humidity (%): 30 - 70
- Air changes (per hr): 15
- 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: back and flanks
- % coverage: 10% of the total body surface area
- Type of wrap if used: surgical gauze with self-adhesive bandage

REMOVAL OF TEST SUBSTANCE
- Washing (if done): yes, with cotton wool moistened with a suitable solvent
- Time after start of exposure: 24 hours

TEST MATERIAL
- Amount applied: 1.83 mL/kg bw

Duration of exposure:

24 hours

Doses:

2000 mg/kg bw

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 subjected for deaths or overt signs of toxicity 0.5, 1, 2 and 4 h after dosing and subsequently once daily for 14 days. After removal of the dressings and subsequently once daily for 14 days, the test sites were examined for evidence of primary irritation anc scored according to Draize. Individual body weights were recorded prior to application of the test substance and 7 and 14 days after treatment.
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight, gross pathology

Results and discussion

Effect levels

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

No deaths were noted until the end of the observation period.

Clinical signs:

other: No signs of systemic toxicity were noted until the end of the 14-day observation period. No skin irritation was observed at all reading time points the values for erythema and edema was 0.

Gross pathology:

No abnormalities were noted at necropsy.

Applicant's summary and conclusion

Interpretation of results:

not classified

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

In this acute dermal toxicity study a LD50 value > 2000 mg/kg bw in male and female rats was found.