4-allylveratrole

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1975

Materials and methods

Test guideline

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Deviations:

yes

Remarks:

poorly documented

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

4-allylveratrole

EC Number:

202-223-0

EC Name:

4-allylveratrole

Cas Number:

93-15-2

Molecular formula:

C11H14O2

IUPAC Name:

1,2-dimethoxy-4-(prop-2-en-1-yl)benzene

Test material form:

liquid

Specific details on test material used for the study:

Purity of each material was checked in the Organic Chemicals Synthesis Laboratory, AEQI, in Beltsville by gas chromatography: > 98%

Test animals

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Weight at study initiation: 1.9-3.1 kg

Test system

Type of coverage:

semiocclusive

Preparation of test site:

clipped

Vehicle:

unchanged (no vehicle)

Controls:

yes, concurrent no treatment

Amount / concentration applied:

0.5 mL

Duration of treatment / exposure:

24 hours

Observation period:

72 hours

Number of animals:

6

Details on study design:

The hair was clipped from the back and flanks of each of 6 rabbits, and two sites located lateral to the midline of the back and approximately 10 cm apart were selected for the test; one site was abraded by making four epidermal incisions, two perpendicular to the other two. A 0.5-ml dose of undiluted test material was applied to each site. The sites were immediately covered with 2-in.-square gauze patches that were secured with masking tape, and the trunk of each animal was wrapped with plastic sheeting to maintain the patches in position and retard evaporation of the test material. After 24 h the plastic wrappings and gauze patches were removed, and the intact and abraded test sites were scored separately for erythema and edema on a graded scale of 0 to 4; after 72 h, the sites were scored again. The mean primary irritation score (maxi- mum = 8) represents an average of the 24- and 72-h ratings of the intact and abraded sites.

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Basis:

mean

Time point:

24/48/72 h

Remarks on result:

no indication of irritation

Results 2

Irritation parameter:

edema score

Basis:

mean

Time point:

24/48/72 h

Remarks on result:

no indication of irritation

Results 3

Irritation parameter:

primary dermal irritation index (PDII)

Basis:

mean

Time point:

24/48/72 h

Score:

0.9

Irritant / corrosive response data:

The substance was determined to be non irritant since the primary irritation score was lower than 5.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The test item was determined to be non irritating to the skin.

Executive summary:

A primary skin irritation test was performed in Albino rabbits. The hair was clipped from the back and flanks of each of 6 rabbits, and two sites located lateral to the midline of the back and approximately 10 cm apart were selected for the test; one site was abraded by making four epidermal incisions, two perpendicular to the other two. A 0.5-ml dose of undiluted test material was applied to each site. The sites were immediately covered with 2-in.-square gauze patches that were secured with masking tape, and the trunk of each animal was wrapped with plastic sheeting to maintain the patches in position and retard evaporation of the test material. After 24 h the plastic wrappings and gauze patches were removed, and the intact and abraded test sites were scored separately for erythema and edema on a graded scale of 0 to 4; after 72 h, the sites were scored again. The mean primary irritation score (maxi- mum = 8) represents an average of the 24- and 72-h ratings of the intact and abraded sites. The mean primary irritation score of the test item was determined to be 0.9 (lower than 5) and thus, it was concluded not be an skin irritant.