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Administrative data

Endpoint:
skin sensitisation: in vivo (non-LLNA)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1991
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study
Cross-referenceopen allclose all
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to other study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1991
Report date:
1991

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 406 (Skin Sensitisation)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method B.6 (Skin Sensitisation)
Deviations:
no
GLP compliance:
yes
Type of study:
split adjuvant test

Test material

Constituent 1
Chemical structure
Reference substance name:
Phenyl N-(4,6-dimethoxypyrimidin-2-yl)carbamate
EC Number:
406-600-2
EC Name:
Phenyl N-(4,6-dimethoxypyrimidin-2-yl)carbamate
Cas Number:
89392-03-0
Molecular formula:
C13H13N3O4
IUPAC Name:
phenyl N-(4,6-dimethoxypyrimidin-2-yl)carbamate
Test material form:
solid: crystalline
Details on test material:
- Identification: IN-E6758
- Description: Off white to light blue solid
- Batch: E52691-89-3-B22
- Purity: approx. 100%
- Expiry date: not indicated
- Storage: at room temperature in a cool place in the dark (avoid high temperatures)

In vivo test system

Test animals

Species:
guinea pig
Strain:
Himalayan
Sex:
not specified
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: BRL Ltd., Basel, Switzerland
- Age at study initiation: approx. 11 weeks
- Weight at study initiation: 330 - 456 gram
- Housing: Group housing of 2 animals per cage with wire-mesh floors (ITL, Sergen, The Netherlands)
- Diet (e.g. ad libitum): Standard guinea pig diet, including ascorbic acid (1600 mg/kg); LC 23-B, pellet diameter 4mm. (Hope Farms, Woerden, The Netherlands). In addition, once a week hay was provided (Broekman Institute, Someren, The Netherlands)
- Water (e.g. ad libitum): Tap water
- Acclimation period: at least five days before start of treatment under test conditions after physical examination

ENVIRONMENTAL CONDITIONS
- Temperature: 21°C
- Humidity: 55%
- Air changes: 15 air changes per hour
- Photoperiod: 12 hours artificial light

Study design: in vivo (non-LLNA)

Inductionopen allclose all
Route:
intradermal
Vehicle:
corn oil
Concentration / amount:
Concentration of test material and vehicle used at induction:
- Topical: 50% wlw in corn oil

Concentration of test material and vehicle used for each challenge:
- 25% in corn oil, topically (2% in second challenge)
- 10% and 5% in corn oil, topically (1% and 0.5% in 2nd challenge)
Challengeopen allclose all
Route:
epicutaneous, semiocclusive
Vehicle:
corn oil
Concentration / amount:
Concentration of test material and vehicle used at induction:
- Topical: 50% wlw in corn oil

Concentration of test material and vehicle used for each challenge:
- 25% in corn oil, topically (2% in second challenge)
- 10% and 5% in corn oil, topically (1% and 0.5% in 2nd challenge)
No. of animals per dose:
Number of animals in test group: 20
Number of animals in negative control group: 10
Positive control substance(s):
not specified

Results and discussion

In vivo (non-LLNA)

Resultsopen allclose all
Reading:
1st reading
Hours after challenge:
24
Group:
test chemical
Dose level:
25%
No. with + reactions:
20
Total no. in group:
20
Remarks on result:
other: Reading: 1st reading. . Hours after challenge: 24.0. Group: test group. Dose level: 25%. No with. + reactions: 20.0. Total no. in groups: 20.0.
Reading:
1st reading
Hours after challenge:
24
Group:
test chemical
Dose level:
10%
No. with + reactions:
20
Total no. in group:
20
Remarks on result:
other: Reading: 1st reading. . Hours after challenge: 24.0. Group: test group. Dose level: 10%. No with. + reactions: 20.0. Total no. in groups: 20.0.
Reading:
1st reading
Hours after challenge:
24
Group:
test chemical
Dose level:
5%
No. with + reactions:
20
Total no. in group:
20
Remarks on result:
other: Reading: 1st reading. . Hours after challenge: 24.0. Group: test group. Dose level: 5%. No with. + reactions: 20.0. Total no. in groups: 20.0.
Reading:
2nd reading
Hours after challenge:
48
Group:
test chemical
Dose level:
25%
No. with + reactions:
20
Total no. in group:
20
Remarks on result:
other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: test group. Dose level: 25%. No with. + reactions: 20.0. Total no. in groups: 20.0.
Reading:
2nd reading
Hours after challenge:
48
Group:
test chemical
Dose level:
10%
No. with + reactions:
20
Total no. in group:
20
Remarks on result:
other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: test group. Dose level: 10%. No with. + reactions: 20.0. Total no. in groups: 20.0.
Reading:
2nd reading
Hours after challenge:
48
Group:
test chemical
Dose level:
5%
No. with + reactions:
20
Total no. in group:
20
Remarks on result:
other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: test group. Dose level: 5%. No with. + reactions: 20.0. Total no. in groups: 20.0.
Reading:
rechallenge
Hours after challenge:
24
Group:
test chemical
Dose level:
25%
No. with + reactions:
20
Total no. in group:
20
Remarks on result:
other: Reading: rechallenge. . Hours after challenge: 24.0. Group: test group. Dose level: 25%. No with. + reactions: 20.0. Total no. in groups: 20.0.
Reading:
rechallenge
Hours after challenge:
24
Group:
test chemical
Dose level:
10%
No. with + reactions:
20
Total no. in group:
20
Remarks on result:
other: Reading: rechallenge. . Hours after challenge: 24.0. Group: test group. Dose level: 10%. No with. + reactions: 20.0. Total no. in groups: 20.0.
Reading:
rechallenge
Hours after challenge:
24
Group:
test chemical
Dose level:
5%
No. with + reactions:
20
Total no. in group:
20
Remarks on result:
other: Reading: rechallenge. . Hours after challenge: 24.0. Group: test group. Dose level: 5%. No with. + reactions: 20.0. Total no. in groups: 20.0.
Reading:
rechallenge
Hours after challenge:
48
Group:
test chemical
Dose level:
25%
No. with + reactions:
19
Total no. in group:
20
Remarks on result:
other: Reading: rechallenge. . Hours after challenge: 48.0. Group: test group. Dose level: 25%. No with. + reactions: 19.0. Total no. in groups: 20.0.
Reading:
rechallenge
Hours after challenge:
48
Group:
test chemical
Dose level:
10%
No. with + reactions:
19
Total no. in group:
20
Remarks on result:
other: Reading: rechallenge. . Hours after challenge: 48.0. Group: test group. Dose level: 10%. No with. + reactions: 19.0. Total no. in groups: 20.0.
Reading:
rechallenge
Hours after challenge:
48
Group:
test chemical
Dose level:
5%
No. with + reactions:
17
Total no. in group:
20
Remarks on result:
other: Reading: rechallenge. . Hours after challenge: 48.0. Group: test group. Dose level: 5%. No with. + reactions: 17.0. Total no. in groups: 20.0.
Reading:
1st reading
Hours after challenge:
24
Group:
negative control
Dose level:
25%
No. with + reactions:
10
Total no. in group:
10
Remarks on result:
other: Reading: 1st reading. . Hours after challenge: 24.0. Group: negative control. Dose level: 25%. No with. + reactions: 10.0. Total no. in groups: 10.0.
Reading:
1st reading
Hours after challenge:
24
Group:
negative control
Dose level:
10%
No. with + reactions:
10
Total no. in group:
10
Remarks on result:
other: Reading: 1st reading. . Hours after challenge: 24.0. Group: negative control. Dose level: 10%. No with. + reactions: 10.0. Total no. in groups: 10.0.
Reading:
1st reading
Hours after challenge:
24
Group:
negative control
Dose level:
5%
No. with + reactions:
10
Total no. in group:
10
Remarks on result:
other: Reading: 1st reading. . Hours after challenge: 24.0. Group: negative control. Dose level: 5%. No with. + reactions: 10.0. Total no. in groups: 10.0.
Reading:
2nd reading
Hours after challenge:
48
Group:
negative control
Dose level:
25%
No. with + reactions:
9
Total no. in group:
10
Remarks on result:
other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: negative control. Dose level: 25%. No with. + reactions: 9.0. Total no. in groups: 10.0.
Reading:
2nd reading
Hours after challenge:
48
Group:
negative control
Dose level:
10%
No. with + reactions:
8
Total no. in group:
10
Remarks on result:
other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: negative control. Dose level: 10%. No with. + reactions: 8.0. Total no. in groups: 10.0.
Reading:
2nd reading
Hours after challenge:
48
Group:
negative control
Dose level:
5%
No. with + reactions:
9
Total no. in group:
10
Remarks on result:
other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: negative control. Dose level: 5%. No with. + reactions: 9.0. Total no. in groups: 10.0.
Reading:
rechallenge
Hours after challenge:
24
Group:
negative control
Dose level:
25%
No. with + reactions:
8
Total no. in group:
10
Remarks on result:
other: Reading: rechallenge. . Hours after challenge: 24.0. Group: negative control. Dose level: 25%. No with. + reactions: 8.0. Total no. in groups: 10.0.
Reading:
rechallenge
Hours after challenge:
24
Group:
negative control
Dose level:
10%
No. with + reactions:
9
Total no. in group:
10
Remarks on result:
other: Reading: rechallenge. . Hours after challenge: 24.0. Group: negative control. Dose level: 10%. No with. + reactions: 9.0. Total no. in groups: 10.0.

Any other information on results incl. tables

Maximum concentration not causing irritating effects in preliminary test: 25%

Signs of irritation during induction: Slight or well-defined erythema (grade 1 or 2) was observed in all the test group animals.

Evidence of sensitisation of each challenge concentration: 14

Other observations:

Severely reduced bodyweight gain was noted in a few test group animals.

Applicant's summary and conclusion

Interpretation of results:
sensitising
Remarks:
Migrated information Criteria used for interpretation of results: EU
Conclusions:
The test item was found to be a skin sensitizer under the conditions of this test.
Executive summary:

The study was performed according to EU-method B.6 as a split adjuvant test on guinea pigs. 20 Test animals and ten control animals were used. The concentration of test material and vehicle used at induction was topical: 50% w/w in corn oil. The concentration of test material and vehicle used for each challenge was 25% in corn oil, topically (2% in second challenge) 10% and 5% in corn oil, topically (1% and 0.5% in 2nd challenge). Evidence of sensitisation of each challenge concentration was 14. In conclusion, the substance hast be classified and labelled as skin sensitizer.