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EC number: 218-566-4 | CAS number: 2184-11-4
Endpoint summary
Administrative data
Description of key information
Key value for chemical safety assessment
Skin sensitisation
Link to relevant study records
- Endpoint:
- skin sensitisation: in vivo (non-LLNA)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 1994-August-23
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 406 (Skin Sensitisation)
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.6 (Skin Sensitisation)
- GLP compliance:
- yes (incl. QA statement)
- Type of study:
- guinea pig maximisation test
- Justification for non-LLNA method:
- The guinea pig maximization test (GPMT) is already available for preivous regulation. Therefore, LLNA is not conducted.
- Species:
- guinea pig
- Strain:
- Pirbright-Hartley
- Sex:
- male/female
- Route:
- intradermal and epicutaneous
- Vehicle:
- physiological saline
- Concentration / amount:
- 5% and 50% reactive red 224 in physiological saline
- Route:
- epicutaneous, occlusive
- Vehicle:
- physiological saline
- Concentration / amount:
- 5% and 50% reactive red 224 in physiological saline
- No. of animals per dose:
- According to the test guidelines the test was started with the minimum number of animals (5 per sex for the test group and 5 of one sex for controls). After the challenge procedure, it was not possible to conclude if the test substance is a sensitiser or not and therefore testing in additional animals was performed to give a total of 20 test and 10 control animals. The initial weight of the animals was between 328 to 404 g.
- Reading:
- 1st reading
- Hours after challenge:
- 24
- Group:
- other: Control group/ vehicle control
- Dose level:
- 0% Direct Red 224
- No. with + reactions:
- 0
- Total no. in group:
- 10
- Clinical observations:
- occlusive epidermal application
- Remarks on result:
- other: Reading: 1st reading. . Hours after challenge: 24.0. Group: other: Control group/ vehicle control. Dose level: 0% Direct Red 224. No with. + reactions: 0.0. Total no. in groups: 10.0. Clinical observations: occlusive epidermal application.
- Reading:
- 1st reading
- Hours after challenge:
- 24
- Group:
- other: Control group/ test article
- Dose level:
- 50% Direct Red 224
- No. with + reactions:
- 0
- Total no. in group:
- 10
- Clinical observations:
- occlusive dermal application
- Remarks on result:
- other: Reading: 1st reading. . Hours after challenge: 24.0. Group: other: Control group/ test article. Dose level: 50% Direct Red 224. No with. + reactions: 0.0. Total no. in groups: 10.0. Clinical observations: occlusive dermal application.
- Reading:
- 1st reading
- Hours after challenge:
- 24
- Group:
- other: Test group/ vehicle control
- Dose level:
- 0% Direct Red 224
- No. with + reactions:
- 0
- Total no. in group:
- 20
- Clinical observations:
- occlusive epidermal application
- Remarks on result:
- other: Reading: 1st reading. . Hours after challenge: 24.0. Group: other: Test group/ vehicle control. Dose level: 0% Direct Red 224. No with. + reactions: 0.0. Total no. in groups: 20.0. Clinical observations: occlusive epidermal application.
- Reading:
- 1st reading
- Hours after challenge:
- 24
- Group:
- other: Test group/ test article
- Dose level:
- 50% Direct Red 224
- No. with + reactions:
- 3
- Total no. in group:
- 20
- Clinical observations:
- occlusive epdermal application. Erythema score 1 in 3 animals and edema score 1 in 1 animal.
- Remarks on result:
- other: see Remark
- Remarks:
- Reading: 1st reading. . Hours after challenge: 24.0. Group: other: Test group/ test article. Dose level: 50% Direct Red 224. No with. + reactions: 3.0. Total no. in groups: 20.0. Clinical observations: occlusive epdermal application. Erythema score 1 in 3 animals and edema score 1 in 1 animal..
- Reading:
- 2nd reading
- Hours after challenge:
- 48
- Group:
- other: Control group/ vehicle control
- Dose level:
- 0% Direct Red 224
- No. with + reactions:
- 0
- Total no. in group:
- 10
- Clinical observations:
- occlusive epidermal application
- Remarks on result:
- other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: other: Control group/ vehicle control. Dose level: 0% Direct Red 224. No with. + reactions: 0.0. Total no. in groups: 10.0. Clinical observations: occlusive epidermal application.
- Reading:
- 2nd reading
- Hours after challenge:
- 48
- Group:
- other: Test group/ vehicle control
- Dose level:
- 50% Direct Red 224
- No. with + reactions:
- 0
- Total no. in group:
- 10
- Clinical observations:
- occlusive epidermal application
- Remarks on result:
- other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: other: Test group/ vehicle control. Dose level: 50% Direct Red 224. No with. + reactions: 0.0. Total no. in groups: 10.0. Clinical observations: occlusive epidermal application.
- Reading:
- 2nd reading
- Hours after challenge:
- 48
- Group:
- other: Test group/ vehicle control
- Dose level:
- 0% Direct Red 224
- No. with + reactions:
- 0
- Total no. in group:
- 20
- Clinical observations:
- occlusive epidermal application
- Remarks on result:
- other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: other: Test group/ vehicle control. Dose level: 0% Direct Red 224. No with. + reactions: 0.0. Total no. in groups: 20.0. Clinical observations: occlusive epidermal application.
- Reading:
- 2nd reading
- Hours after challenge:
- 48
- Group:
- other: Test group/ test article
- Dose level:
- 50% Direct Red 224
- No. with + reactions:
- 3
- Total no. in group:
- 20
- Clinical observations:
- occlusive epidermal application. Erythema score 1 in 3 animals and edema socre 1 in 1 animal.
- Remarks on result:
- other: see Remark
- Remarks:
- Reading: 2nd reading. . Hours after challenge: 48.0. Group: other: Test group/ test article. Dose level: 50% Direct Red 224. No with. + reactions: 3.0. Total no. in groups: 20.0. Clinical observations: occlusive epidermal application. Erythema score 1 in 3 animals and edema socre 1 in 1 animal..
- Interpretation of results:
- not sensitising
- Remarks:
- Migrated information Criteria used for interpretation of results: EU
- Conclusions:
- Under the experimental conditions employed (Guinea Pig Maximisation Test), 15% of the animals of the test group showed skin reactions 24 and 48 hours after removing the dressings.
According to CLP (1272/2008) and DSD (67/548/EEC), Direct Red 224 did not show a skin-sensitising potential in albino pigs. - Executive summary:
A sensitization test was performed to determine the contact allergenic potency of Direct Red 224 in albino guinea pigs.
Total of 20 test and 10 control guinea pigs have been used.
An intradermal induction test is with 5% Direct Red 224. Epidermal applications in an induction and a challenge are with 50% Direct Red 224.
Under the experimental conditions employed (Guinea Pig Maximisation Test), 15% of the animals of the test group showed skin reactions 24 and 48 hours after removing the dressings. Body weights were not affected by treatment.
According to CLP (1272/2008) and DSD (67/548/EEC), Direct Red 224 did not show a skin-sensitising potential in albino pigs.
Reference
Observations and records
Induction reactions
The animals were pretreated with 10% sodium-laurylsulfate on day 7.
After removal of the dressing on day 10, irritation of the epidermal application site was observed in 10/10 control and in 20/20 test group animals.
Challenge reactions
Twenty four and forty eight hours after removing the dressings, the challenge reactions were graded according to the Draize scoring scale.
Results
The incidence of positive animals per group, the individual challenge reactions and the evaluation of the primary skin irritation potential are listed inTables 1, 2, 3 and 4 in the report. In this end study report, only the most important table 3 is shown.
The individual animal weights at start and end of the test are listed inTable 5 in the report.Body weights were not affected by treatment.
Under the experimental conditions employed, 15% of the animals of the test group showed skin reactions 24 and 48 hours after removing the dressings.
Direct Red 224 is, therefore, classified as a mild sensitiser in albino guinea pigs according to the Maximisation grading (Magnusson and Kligman).
According to the EEC classification criteria (Commission Directive 93/21/EEC) Direct Red 224 did not show a skin-sensitising (contact allergenic) potential in albino guinea pigs.
Table 3 Challenge reactions after epidermal application (test group)
DRAIZE Score 24 hours after removal of the dressing
Vehicle control |
|
|
|
|
|
|
|
|
|
|
Male animal |
166 |
167 |
168 |
169 |
170 |
106 |
107 |
108 |
109 |
110 |
Erythema score |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
Edema score |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
Female animal |
176 |
177 |
178 |
179 |
180 |
116 |
117 |
118 |
119 |
120 |
Erythema score |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
Edema score |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
Test article |
|
|
|
|
|
|
|
|
|
|
Male animal |
166 |
167 |
168 |
169 |
170 |
106 |
107 |
108 |
109 |
110 |
Erythema score |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
Edema score |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
Female animal |
176 |
177 |
178 |
179 |
180 |
116 |
117 |
118 |
119 |
120 |
Erythema score |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
1 |
Edema score |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
DRAIZE Score 48 hours after removal of the dressing
Vehicle control |
|
|
|
|
|
|
|
|
|
|
Male animal |
166 |
167 |
168 |
169 |
170 |
106 |
107 |
108 |
109 |
110 |
Erythema score |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
Edema score |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
Female animal |
176 |
177 |
178 |
179 |
180 |
116 |
117 |
118 |
119 |
120 |
Erythema score |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
Edema score |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
Test article |
|
|
|
|
|
|
|
|
|
|
Male animal |
166 |
167 |
168 |
169 |
170 |
106 |
107 |
108 |
109 |
110 |
Erythema score |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
Edema score |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
Female animal |
176 |
177 |
178 |
179 |
180 |
116 |
117 |
118 |
119 |
120 |
Erythema score |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
1 |
Edema score |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
Endpoint conclusion
- Endpoint conclusion:
- no adverse effect observed (not sensitising)
- Additional information:
A sensitization test was performed to determine the contact allergenic potency of Direct Red 224 in albino guinea pigs.
Total of 20 test and 10 control guinea pigs have been used.
An intradermal induction test is with 5% Direct Red 224. Epidermal applications in an induction and a challenge are with 50% Direct Red 224.
Under the experimental conditions employed (Guinea Pig Maximisation Test), 15% of the animals of the test group showed skin reactions 24 and 48 hours after removing the dressings. Body weights were not affected by treatment.
According to CLP (1272/2008) and DSD (67/548/EEC), Direct Red 224 did not show a skin-sensitising potential in albino pigs.
Justification for classification or non-classification
According to CLP (1272/2008) and DSD (67/548/EEC), Direct Red 224 did not show a skin-sensitising potential in albino pigs.
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