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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
Study period:
1976
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Acceptable, well-documented study report which meets basic scientific principles.
Cross-reference
Reason / purpose for cross-reference:
reference to same study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1976
Report date:
1976

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: FDA guideline (Fed. Reg. Vol. 38, No. 187, p. 27019, 1973)
Deviations:
not specified
GLP compliance:
no
Remarks:
GLP was not compulsory at the time the study was conducted

Test material

Constituent 1
Chemical structure
Reference substance name:
4-[(2,5-dichlorophenyl)azo]-3-hydroxy-N-phenylnaphthalene-2-carboxamide
EC Number:
227-930-1
EC Name:
4-[(2,5-dichlorophenyl)azo]-3-hydroxy-N-phenylnaphthalene-2-carboxamide
Cas Number:
6041-94-7
Molecular formula:
C23H15Cl2N3O2
IUPAC Name:
4-[(2,5-dichlorophenyl)diazenyl]-3-hydroxy-N-phenyl-2-naphthamide
Test material form:
solid: nanoform, no surface treatment
Details on test material:
Name of test material (as cited in study report): Permanentrot FRR CM 79883
Analytical purity: technically pure.

Test animals

Species:
rabbit
Strain:
Himalayan
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Housing: individually
- Weight at study initiation: 1.5-2.0 kg
- Diet: mixed feed ERKA 8300 (Robert Koch, Hamm), ad libitum
- Water: tap water, ad libitum

Test system

Type of coverage:
occlusive
Preparation of test site:
other: clipped intact and clipped scarified
Vehicle:
other: seasame oil or undiluted
Controls:
no
Amount / concentration applied:
TEST MATERIAL
- Amount applied: 0.5 ml of 10 % dilution and 500 mg of undiluted substance
Duration of treatment / exposure:
24 h
Observation period:
48 h after end of exposure
Number of animals:
6
Details on study design:
TEST SITE
- Area of exposure: 2.5 x 2.5 cm gauze patch
- Type of wrap if used: PVC foil, elastic bandage

REMOVAL OF TEST SUBSTANCE
- Time after start of exposure: 24 h

SCORING SYSTEM: described in § 1500.41 in Fed. Reg. 38, No. 187, 27.09.1973, p.27019, in accordance with OECD TG 404.
Scores were assessed 24, 48 and 72 h after start of exposure, which lasted for 24 h. For classification, the readings are stated here as immediately, 24 and 48 h after end of exposure.

Results and discussion

In vivo

Resultsopen allclose all
Irritation parameter:
erythema score
Basis:
animal: #1, #2, #3, #4, #5, #6
Time point:
24/48 h
Score:
ca. 0
Max. score:
4
Reversibility:
other: reversibility not relevant since no effect
Remarks on result:
other: clipped intact and clipped scarified
Irritation parameter:
edema score
Basis:
animal: #1, #2, #3, #4, #5, #6
Time point:
24/48 h
Score:
ca. 0
Max. score:
4
Reversibility:
other: reversibility not relevant since no effect
Remarks on result:
other: clipped intact and clipped scarified
Irritant / corrosive response data:
None of the animals showed oedema or erythema at the intact or scarified skin at any time point (immediately, 24 and 48 hours after end of exposure)

Applicant's summary and conclusion

Interpretation of results:
not irritating
Remarks:
Migrated information Criteria used for interpretation of results: EU
Conclusions:
The test material is not irritating to skin under these test conditions.
This conclusion is legitimate even though the applied testing regime differs from today's standard methods. Since the test conditions were more stringent than required by OECD TG 404 (i.e. 24 h treatment, occlusive coverage, and scarified skin instead of 4 h treatment, semi-occlusive coverage, and intact skin) the test results are considered adequate to fulfill the endpoint requirements.
Executive summary:

The test material was tested for skin irritancy according to FDA guidelines. Both intact and scarified skin sites of six rabbits were exposed to 0.5 g test substance or 0.5 mL of a dilution (10 % in sesame oil) for 24 h under occlusive conditions and the skin responses were watched for 48 hours after end of exposure. No erythema or edema were seen at any time point (score 0). The test item is not irritating under these test conditions.

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