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Toxicological information

Skin irritation / corrosion

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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:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2009
Report Date:
2009

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 404 (Acute Dermal Irritation / Corrosion)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 870.2500 (Acute Dermal Irritation)
Deviations:
no
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Purity: not reported as such

Test animals

Species:
rabbit
Strain:
New Zealand White
Details on test animals and environmental conditions:
TEST ANIMALS
- Age at study initiation: Young adult
- Weight at study initiation: 2491, 2520, 2742 g
- Housing: singly in suspended stainless steel cages with mesh floors. Enrichment (e.g., toy) was placed in each cage. Litter paper was placed beneath the cage and was changed at least 3 times per week.
- Diet (e.g. ad libitum): ad libitum, Pelleted Purina Rabbit Chow #5326
- Water (e.g. ad libitum): ad libitum, filtered tap water
- Acclimation period: 6 or 14 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19-21ºC
- Humidity (%): 56-68%
- Air changes (per hr): Not reported
- Photoperiod (hrs dark / hrs light): 12-hour light/dark cycle

Test system

Type of coverage:
semiocclusive
Preparation of test site:
shaved
Vehicle:
unchanged (no vehicle)
Controls:
no
Amount / concentration applied:
TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 0.5 mL
Duration of treatment / exposure:
4 hours.
Observation period:
Immediately following patch removal and at approximately 30-60 minutes and 24, 48, and 72 hours after patch removal.
Number of animals:
3
Details on study design:
TEST SITE
- Area of exposure: 6 cm²
- % coverage: 100%
- Type of wrap if used: The dose site was covered with a 1-inch x 1 inch, 4-ply gauze pad. The pad and entire trunk of each rabbit was wrapped with semi-occlusive tape. Elizabethan collars were placed on each rabbit.

REMOVAL OF TEST SUBSTANCE
- Washing (if done): test substance removed and the test sites gently cleansed of any residual test substance.
- Time after start of exposure: After 4 hours of exposure.

SCORING SYSTEM: Draize scoring system.

Results and discussion

In vivo

Resultsopen allclose all
Irritation parameter:
erythema score
Basis:
mean
Time point:
other: calculated from the 24-, 48-, and 72-hour scores
Score:
0
Max. score:
4
Irritation parameter:
edema score
Basis:
mean
Time point:
other: calculated from the 24-, 48-, and 72-hour scores
Score:
0
Max. score:
4
Irritant / corrosive response data:
There was no edema noted at any treated dose site during the study. Immediately following patch removal, very slight erythema was noted for two of three treated dose sites. Both animals were free from dermal irritation within 30-60 minutes. No clinical signs of toxicity were observed in any of the rabbits during the study and no body weight loss occurred. The dermal scores from individual animals with respect to observation time are presented in Table 1.

Any other information on results incl. tables

Table 1: Individual Skin Irritation Scores; Erythema/Edema

 

 

Time After patch Removal

Animal No.

Sex

Immediately after patch removal

30-60 mins

24 hrs

48 hrs

72 hrs

3501

F

1/0

0/0

0/0

0/0

0/0

3502

M

0/0

0/0

0/0

0/0

0/0

3503

M

1/0

0/0

0/0

0/0

0/0

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Conclusions:
There was no edema noted at any treated dose site during the study. Immediately following patch removal, very slight erythema was noted for two of three treated dose sites. Both animals were free from dermal irritation within 30-60 minutes.
Executive summary:

The study was conducted in a stepwise manner using a single patch applied initially to one rabbit for 4-hours. Five-tenths of a millilitre of the test substance was applied to the skin of one healthy rabbit for 4-hours. The dose site was evaluated for dermal irritation by the method of Draize et al immediately following patch removal, and at 30-60 minutes and 24, 48, and 72 hours after patch removal. Since dermal irritation cleared within one hour in this animal, the test was completed on two additional animals. There was no edema noted at any treated dose site during the study. Immediately following patch removal, very slight erythema was noted for two of three treated dose sites. Both animals were free from dermal irritation within 30-60 minutes.