(3S-cis)-3,6-dimethyl-1,4-dioxane-2,5-dione

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1998

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.4 (Acute Toxicity: Dermal Irritation / Corrosion)

Principles of method if other than guideline:

Batch no: DA 778 FN
Purity: >99.5%

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

(3S-cis)-3,6-dimethyl-1,4-dioxane-2,5-dione

EC Number:

224-832-0

EC Name:

(3S-cis)-3,6-dimethyl-1,4-dioxane-2,5-dione

Cas Number:

4511-42-6

Molecular formula:

C6H8O4

IUPAC Name:

3,6-dimethyl-1,4-dioxane-2,5-dione

Test animals

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

Upon arrival, the rabbits were checked for overt signs of ill health and anomalies. Test animals were females, young adult and were quarantined 54 or 55 days upon arrival. At the start of the study, body weight was 3060-3405 g. Animals were housed individually in stainless steel cages with perforated floor under a 12hlight/12hdark cycle at 20 ± 3 °C and 50-76% humidity (upper limit higher than 70%, because of wet cleaning of the animal room and/or meteorological circumstances; the 76% peak occurred for one hour at most); ventilation was ca 10 air changes/hour. Animals were fed standard laboratory rabbit diet ad libitum. Each batch of this diet is analyzed by the supplier (SDS Special Diets services, Whitham, England) for the nutrients and contaminants and the results are available upon request). Tap water (N.V. Waterleidingbedrijf Midden-Nederland) was available ad libitum. Results of routine physical, chemical and microbiological examination of drinking water as conducted by the supplier are available upon request.

Three or four days prior to the start of the study, the hair was removed from the back and flanks of the animals using electric clippers in a way as to avoid abrasions. The clipping was repeated if considered necessary.

Test system

Type of coverage:

occlusive

Preparation of test site:

shaved

Vehicle:

water

Controls:

no

Amount / concentration applied:

0.5 g test substance and 0.5 g water; skin area ca 2.5 cm2.

Duration of treatment / exposure:

4 hour exposure.

Observation period:

Observation at 1, 24, 48, 72 hours after exposure.

Number of animals:

3

Details on study design:

TEST SITE
- Area of exposure: ca 4.9 cm2
- % coverage: full
- Type of wrap if used: covered with a cup.

REMOVAL OF TEST SUBSTANCE
- Washing (if done): moistened tissue
- Time after start of exposure: 4 hours

SCORING SYSTEM: Draize et al. (1944)

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

overall irritation score

Basis:

mean

Time point:

other: 1

Score:

0

Max. score:

0

Results 2

Irritation parameter:

primary dermal irritation index (PDII)

Basis:

mean

Time point:

other: 24

Score:

0

Max. score:

0

Results 3

Irritation parameter:

overall irritation score

Basis:

mean

Time point:

other: 48

Score:

0

Max. score:

0

Results 4

Irritation parameter:

overall irritation score

Basis:

mean

Time point:

other: 72

Score:

0

Max. score:

0

Irritant / corrosive response data:

No irritation

Other effects:

None

Applicant's summary and conclusion

Interpretation of results:

not irritating

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

L-lactide is not irritating to the skin.

Executive summary:

A sample of L-dilactide was tested for acute dermal irritating properties in an experiment with three albino rabbits. The dermal exposure period was 4 hours under semi-occlusive conditions. L-dilactide did not cause any skin effects in the three rabbits. According to the EC-standards L-dilactide is not irritating to (human) skin.