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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
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Remarks:
Comparable to guideline study with deficiencies in reporting.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1982
Report date:
1982

Materials and methods

Test guideline
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 406 (Skin Sensitisation)
Deviations:
yes
Remarks:
: no grading but only sensitisation-positive animals were reported.
GLP compliance:
no
Type of study:
guinea pig maximisation test
Justification for non-LLNA method:
The study was performed in 1982.

Test material

Constituent 1
Chemical structure
Reference substance name:
1-[4-(1,1-dimethylethyl)phenyl]-3-(4-methoxyphenyl)propane-1,3-dione
EC Number:
274-581-6
EC Name:
1-[4-(1,1-dimethylethyl)phenyl]-3-(4-methoxyphenyl)propane-1,3-dione
Cas Number:
70356-09-1
Molecular formula:
C20H22O3
IUPAC Name:
1-(4-tert-butylphenyl)-3-(4-methoxyphenyl)propane-1,3-dione
Test material form:
solid
Details on test material:
- Name of test material : BMDBM
- Substance type: organic
- Physical state: solid

In vivo test system

Test animals

Species:
guinea pig
Strain:
Himalayan
Sex:
male/female
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: Institute of biological research, Fuellingsdorf, Switzerland
- Weight at study initiation: 300 - 450 g
- Housing: Type 3 wire mesh cages
- Water: ad libitum

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 ± 2 °C
- Humidity (%): 45 ± 10 %
- Photoperiod (hrs dark / hrs light): 12/12

Study design: in vivo (non-LLNA)

Induction
Route:
intradermal and epicutaneous
Vehicle:
other: 2-phenylethanol
Concentration / amount:
Induction:
day 0: 5 % in FCA
day 8: 20 % in 2-phenylethanol
Challenge
Route:
epicutaneous, occlusive
Vehicle:
other: 2-phenylethanol
Concentration / amount:
Challenge:
day 21: 20 % and 6 % in 2-phenylethanol
No. of animals per dose:
Experimantal group: 20 animals
Details on study design:
MAIN STUDY
A. INDUCTION EXPOSURE
On day 0, each of the 20 animals received 2 intradermal injections of either the test item, FCA, or FCA + test item. On day 8, occlusive topical application of the test item for 2 days was performed.
- Site: neck

B. CHALLENGE EXPOSURE
On day 21, an occlusive patch with the test item (20 % and 6 %) in 2-phenylethanol was applied for 24 h.
- Site: flank
- Evaluation: 24 and 48 h after removing the patch
Positive control substance(s):
no

Results and discussion

In vivo (non-LLNA)

Resultsopen allclose all
Key result
Reading:
other: mean of two readings after 24 and 48h
Hours after challenge:
48
Group:
test chemical
Dose level:
6 % and 20 %
No. with + reactions:
0
Total no. in group:
20
Reading:
1st reading
Group:
positive control
Remarks on result:
not measured/tested
Reading:
1st reading
Group:
negative control
Remarks on result:
not measured/tested

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Conclusions:
The occlusive challenge with BMDBM, 20 % and 6 % in 2-phenylethanol 3 weeks after the initial injections does not elicit allergic reactions in guinea pigs. As the number of positive results is 0 in a group of 20 treated animals, no classification as skin sensitiser is needed.
Executive summary:

The occlusive challenge with BMDBM, 20 % and 6 % in 2-phenylethanol 3 weeks after the initial injections does not elicit allergic reactions in guinea pigs.

As the the number of positive results is 0 in a group of 20 treated animals, no classification as skin sensitising according to GHS and CLP is needed.