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Toxicological information

Skin sensitisation

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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:
from 1990-04-30 to 1990-05-24
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study without detailed documentation

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1990
Report Date:
1990

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 406 (Skin Sensitisation)
Principles of method if other than guideline:
Magnusson & Kligman maximisation test (J. Invest. Dermatol. 52, 268-276, 1969)
GLP compliance:
no
Type of study:
Freund's complete adjuvant test
Justification for non-LLNA method:
The test was carried out before the Reach law was in force.

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid
Specific details on test material used for the study:
Purity: 99.5%

In vivo test system

Test animals

Species:
guinea pig
Strain:
Dunkin-Hartley
Sex:
female
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: F. Winkelmann, Borchen, Germany
- Age at study initiation: not mentioned
- Weight at study initiation: average 377 g (control group) and 368 g (test group)
- Housing: conventional, Makrolon Type IV cages (maximum 5 animals per cage)
- Diet (e.g. ad libitum): Ssniff G4 complete feed for guinea pigs ad libitum, supplied by Ssniff Spezialfutter GmbH, Soest, Germany
- Water (e.g. ad libitum): drinking water ad libitum
- Acclimation period: not mentioned

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20 ± 1
- Humidity (%): 60 ± 5
- Air changes (per hr): 15
- Photoperiod (hrs dark / hrs light): 12/12

IN-LIFE DATES: not mentioned

Study design: in vivo (non-LLNA)

Inductionopen allclose all
Route:
intradermal
Vehicle:
corn oil
Concentration / amount:
- Concentrations used for induction: intradermal: 5% v/v in corn oil;
- Concentration in Freunds Complete Adjuvants (FCA): 5%; dermal: 50% v/v in corn oil.
- Challenge schedule: day 21: removal of patches after 24 hours, evaluation after 24 and 48 hours after patch removal.
- Concentrations used for challenge: 25% v/v in corn oil.
Challengeopen allclose all
Route:
epicutaneous, occlusive
Vehicle:
corn oil
Concentration / amount:
- Concentrations used for induction: intradermal: 5% v/v in corn oil;
- Concentration in Freunds Complete Adjuvants (FCA): 5%; dermal: 50% v/v in corn oil.
- Challenge schedule: day 21: removal of patches after 24 hours, evaluation after 24 and 48 hours after patch removal.
- Concentrations used for challenge: 25% v/v in corn oil.
No. of animals per dose:
test animals: 20 (main experiment)
control animals: 10
Details on study design:
RANGE FINDING TESTS: was performed with 25% test substance in corn oil

MAIN STUDY
A. INDUCTION EXPOSURE
- No. of exposures: 1
- Exposure period: intradermal: 5% v/v in corn oil;
- Concentration in Freunds Complete Adjuvants (FCA): 5%
- Test group: dermal: test substance in corn oil (2 x 4 cm patch)
- Control group: corn oil (2 x 4 cm patch)
- Frequency of applications: day 0: intradermal treatment, day 6: pretreatment with sodium dodecyl sulphate (10% in vaseline) and day 7: dermal treatment
- Duration: removal of patches after 48 hours
- Concentrations: 25% v/v, test substance was melt and stored at 40 °C

B. CHALLENGE EXPOSURE
- No. of exposures: 1
- Day(s) of challenge: on day 21
- Exposure period: dermal application for 24 hours
- Test groups: test substance in corn oil (2 x 2 cm patch)
- Control group: corn oil (2 x 2 cm patch)
- Site: left flanks
- Concentrations: 25% v/v
- Evaluation (hr after challenge): 24 and 48 hours after application
Challenge controls:
not performed
Positive control substance(s):
no

Results and discussion

In vivo (non-LLNA)

Results
Key result
Reading:
1st reading
Hours after challenge:
48
Group:
test group
No. with + reactions:
0
Total no. in group:
20
Remarks on result:
no indication of skin sensitisation

Any other information on results incl. tables

RESULTS OF PILOT STUDY: no dermal irritation, no more details were mentioned

RESULTS OF TEST

- Sensitization reaction: All animals of the control group and of the test substance treated animals showed after 24 and 48 hours none specific findings (Score = 0).

- Clinical signs: 1 hour after i.c. injection: all animals of test substance and control groups showed erythema (E) and oedema (O) at the injection sites, except one animal treated with Freund¿s Adjuvant (FCA) and vehicle (H2O), which showed E, O and necrosis (N) at the injection site. 24 hours after i.c. injection: all animals of the control and test substance groups showed erythema and oedema, partly also necrosis. Reactions after dermal administration: 1 hour after patch removal: all animals of control and test substance groups showed E, O of the whole application area. 24 hours after patch removal: all animals showed E and O of the whole application area as well as eschar formation of the inflamed injection sites

- Body weights: The fluctuation in body weight observed in the test animals during the test are not regarded as related to the substance because comparable changes in bodyweight occurred for the control animals.

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met