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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:
1985-05-02 to 1985-06-01
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1985
Report date:
1985

Materials and methods

Test guideline
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 406 (Skin Sensitisation)
Version / remarks:
adopted 12 May 1981
Deviations:
yes
Remarks:
No pretreatment to create local skin irritation was done before epicutaneous induction.
GLP compliance:
yes
Type of study:
guinea pig maximisation test
Justification for non-LLNA method:
A valid GPMT conducted comparable to guideline with acceptable restrictions is available, which is reliable with restrictions and adequate for classification and labelling purposes. Potency estimation is not mandatory when existing guideline and GLP conforming data are available, which were conducted before the new annex of the REACH Regulation entered into force.

Test material

Constituent 1
Chemical structure
Reference substance name:
2,2,2-trifluoroethyl methacrylate
EC Number:
206-525-3
EC Name:
2,2,2-trifluoroethyl methacrylate
Cas Number:
352-87-4
Molecular formula:
C6H7F3O2
IUPAC Name:
2,2,2-trifluoroethyl methacrylate
Test material form:
other: liquid
Details on test material:
- Name of test material (as cited in study report): MATRIFE

In vivo test system

Test animals

Species:
guinea pig
Strain:
Dunkin-Hartley
Sex:
female
Details on test animals and environmental conditions:
TEST ANIMALS
- Age at study initiation: 8 – 12 weeks
- Weight at study initiation: 420 – 495 g
- Housing: in groups of 4 in solid floor polypropylene cages, furnished with softwood shavings
- Diet (e.g. ad libitum): standard laboratory guinea pig diet, ad libitum
- Water (e.g. ad libitum): tap water, ad libitum
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22±3°C
- Humidity (%): 45-65%
- Air changes (per hr): approx. 10/h
- Photoperiod (hrs dark / hrs light): 12/12

Study design: in vivo (non-LLNA)

Inductionopen allclose all
Route:
intradermal and epicutaneous
Vehicle:
arachis oil
Concentration / amount:
intradermal induction: 5% in Arachis oil
topical induction: 100% as supplied
challenge: 100% as supplied
Challengeopen allclose all
Route:
epicutaneous, occlusive
Vehicle:
arachis oil
Concentration / amount:
intradermal induction: 5% in Arachis oil
topical induction: 100% as supplied
challenge: 100% as supplied
No. of animals per dose:
20 (test group, control group)
Details on study design:
RANGE FINDING TESTS:
- intradermal injection of 0.1 mL of 1% and 5% test substance in arachis oil (one guinea pig/concentration)
- observation after 24, 48, 72 h and 7 days for signs of toxicity and necrosis

- topical application of 50% (vehicle: abs. ethanol) and 100% for 24 h (4 guinea pigs, each treated with 50% and 100%)
- observation after patch removal: 1, 24, 48 h for signs of irritation

MAIN STUDY
A. INDUCTION EXPOSURE
Intradermal induction
- No. of exposures: 1
- Test groups: test substance
- Control group: vehicle (arachis oil)
- Site: shoulder region, pairwise injections
- Concentrations:
0.1 mL Freund’s complete adjuvant (FCA)
0.1 mL 5% test substance in Arachis oil (or vehicle only in control)
0.1 mL 50:50 mixture of 5% test substance (or vehicle only in control) and FCA

Topical induction
- No. of exposures: 1
- Exposure period: 48 h
- Test groups: 100% test substance
- Control group: vehicle
- Site: shoulder region, same as for intradermal injections
- Frequency of applications: 1
- Duration:
- Concentrations: 100% (or vehicle in control)
- No pretreatment to create local skin irritation was done before epicutaneous induction.


B. CHALLENGE EXPOSURE
- No. of exposures: 1
- Day(s) of challenge: day 21
- Exposure period: 24 h
- Test groups: 100% test substance (right), vehicle (left)
- Control group: 100% test substance (right), vehicle (left)
- Site: flanks
- Concentrations: 100%
- Evaluation (hr after challenge): 24 h, 48 h
Positive control substance(s):
not specified
Remarks:
sensitivity of the animals is regularly checked in the laboratory

Results and discussion

In vivo (non-LLNA)

Resultsopen allclose all
Key result
Reading:
1st reading
Hours after challenge:
24
Group:
test chemical
Dose level:
100%
No. with + reactions:
17
Total no. in group:
20
Clinical observations:
reduced body weight gain
Remarks on result:
other: Reading: 1st reading. . Hours after challenge: 24.0. Group: test group. Dose level: 100%. No with. + reactions: 17.0. Total no. in groups: 20.0. Clinical observations: reduced body weight gain.
Key result
Reading:
2nd reading
Hours after challenge:
48
Group:
test chemical
Dose level:
100%
No. with + reactions:
16
Total no. in group:
20
Clinical observations:
reduced body weight gain
Remarks on result:
other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: test group. Dose level: 100%. No with. + reactions: 16.0. Total no. in groups: 20.0. Clinical observations: reduced body weight gain.
Key result
Reading:
1st reading
Hours after challenge:
24
Group:
negative control
Dose level:
100%
No. with + reactions:
0
Total no. in group:
20
Clinical observations:
No positive reaction.
Remarks on result:
other: Reading: 1st reading. . Hours after challenge: 24.0. Group: negative control. Dose level: 100%. No with. + reactions: 0.0. Total no. in groups: 20.0.
Key result
Reading:
2nd reading
Hours after challenge:
48
Group:
negative control
Dose level:
100%
No. with + reactions:
0
Total no. in group:
20
Clinical observations:
No positive reaction.
Remarks on result:
other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: negative control. Dose level: 100%. No with. + reactions: 0.0. Total no. in groups: 20.0.

Any other information on results incl. tables

Dose range finding test:

Intradermal application:

- 1 % and 5 %: no evidence of necrosis or systemic toxicity -> 5% is used for the main study

Topical application:

- 100 % (undiluted) and 50%: no irritant response in any animal at any observation -> 100% is used for the main study

 

Main study:

Induction: no documentation of reactions

Challenge:

- no dermal reactions in the control group

- at the 24 h reading 10/20 animals showed moderate diffuse redness (grade 2), 7/20 animals showed scattered mild redness (grade 1) and 3/20 showed no dermal reaction

- at the 48 h reading 7/20 animals showed moderate diffuse redness (grade 2), 9/20 animals showed scattered mild redness (grade 1) and 4/20 animals showed no dermal reaction

Body weight gains of the test group was slightly reduced between day 0 and 24 compared to the control animals. 3 animals in the experimental group showed body weight losses.

Applicant's summary and conclusion

Interpretation of results:
Category 1 (skin sensitising) based on GHS criteria
Conclusions:
TFMEA was sensitising in this GPMT test.
Executive summary:

In a dermal sensitisation study similar to OECD guideline 406, adopted 12 May 1981, with TFMEA (not given in the study report, but according to sponsor >90%), 20 young adult female Dunkin-Hartley guinea pigs were tested using the method of Magnusson & Kligman (Guinea Pig Maximisation Test).

Test concentrations were selected based on pretest results. For the intradermal and epicutaneous induction procedure concentrations of 5% in arachis oil and 100% were used, respectively. The test article concentration for the challange procedure was 100%. No pretreatment to create local skin irritation was done before epicutaneous induction.

After challenge10/20 animals showed moderate diffuse redness (grade 2), 7/20 animals showed scattered mild redness (grade 1) and 3/20 showed no dermal reaction at the 24 h observation. Similar results were observed after 48 h. No dermal reactions were noted in the control group.

 

The test material produced a response in 85% of the animals. According to CLP, EU GHS (Regulation (EC) No 1272/2008), a response of at least 30% of the test animals of an adjuvant type guinea pig test method for skin sensitisation is considered as positive.

TFMEA is a dermal sensitiser in this study.