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Toxicological information

Skin sensitisation

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Administrative data

Endpoint:
skin sensitisation: in vivo (LLNA)
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2011
Report date:
2011

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 429 (Skin Sensitisation: Local Lymph Node Assay)
Deviations:
no
GLP compliance:
yes
Type of study:
mouse local lymph node assay (LLNA)

Test material

Constituent 1
Chemical structure
Reference substance name:
rel-((3aR,6R)-7,7-dimethyl-8-methyleneoctahydro-1H-3a,6-methanoazulen-3-yl)methyl acetate
Molecular formula:
C17H26O2
IUPAC Name:
rel-((3aR,6R)-7,7-dimethyl-8-methyleneoctahydro-1H-3a,6-methanoazulen-3-yl)methyl acetate
Constituent 2
Chemical structure
Reference substance name:
2-(8,8a-dimethyl-3,4,6,7,8,8a-hexahydronaphthalen-2(1H)-ylidene)propyl acetate
Molecular formula:
C17H26O2
IUPAC Name:
2-(8,8a-dimethyl-3,4,6,7,8,8a-hexahydronaphthalen-2(1H)-ylidene)propyl acetate
Constituent 3
Chemical structure
Reference substance name:
rel-(8R,8aS)-8,8a-dimethyl-2-(propan-2-ylidene)-1,2,3,7,8,8a-hexahydronaphthalene
Molecular formula:
C15H22
IUPAC Name:
rel-(8R,8aS)-8,8a-dimethyl-2-(propan-2-ylidene)-1,2,3,7,8,8a-hexahydronaphthalene
Constituent 4
Chemical structure
Reference substance name:
rel-(5R,10R)-6,10-dimethyl-2-(propan-2-ylidene)spiro[4.5]dec-6-en-8-one
Cas Number:
22196-46-9
Molecular formula:
C15H22O
IUPAC Name:
rel-(5R,10R)-6,10-dimethyl-2-(propan-2-ylidene)spiro[4.5]dec-6-en-8-one
Constituent 5
Chemical structure
Reference substance name:
rel-(4R,4aS)-4,4a-dimethyl-6-(propan-2-ylidene)-4,4a,5,6,7,8-hexahydronaphthalen-2(3H)-one
Cas Number:
16981-90-1
Molecular formula:
C15H22O
IUPAC Name:
rel-(4R,4aS)-4,4a-dimethyl-6-(propan-2-ylidene)-4,4a,5,6,7,8-hexahydronaphthalen-2(3H)-one
Constituent 6
Chemical structure
Reference substance name:
rel-(1R,8aS)-1,8a-dimethyl-7-(propan-2-ylidene)-1,2,3,7,8,8a-hexahydronaphthalene
Molecular formula:
C15H22
IUPAC Name:
rel-(1R,8aS)-1,8a-dimethyl-7-(propan-2-ylidene)-1,2,3,7,8,8a-hexahydronaphthalene
Constituent 7
Chemical structure
Reference substance name:
2-methoxy-4-prop-1-enylphenyl acetate
EC Number:
202-236-1
EC Name:
2-methoxy-4-prop-1-enylphenyl acetate
Cas Number:
93-29-8
Molecular formula:
C12H14O3
IUPAC Name:
2-methoxy-4-(prop-1-en-1-yl)phenyl acetate
Constituent 8
Chemical structure
Reference substance name:
rel-(1R,4aS,8aR)-1,4a-dimethyl-7-(prop-1-en-2-yl)-1,2,3,4,4a,5,6,8a-octahydronaphthalene
Molecular formula:
C15H24
IUPAC Name:
rel-(1R,4aS,8aR)-1,4a-dimethyl-7-(prop-1-en-2-yl)-1,2,3,4,4a,5,6,8a-octahydronaphthalene
Constituent 9
Chemical structure
Reference substance name:
rel-(3aR,6R,8aR)-7,7-dimethyl-8-methylenehexahydro-1H-3a,6-methanoazulen-3(2H)-one
Cas Number:
64550-95-4
Molecular formula:
C14H20O
IUPAC Name:
rel-(3aR,6R,8aR)-7,7-dimethyl-8-methylenehexahydro-1H-3a,6-methanoazulen-3(2H)-one
Constituent 10
Chemical structure
Reference substance name:
rel-(1R,4aS,8aR)-1-isopropyl-4,7-dimethyl-1,2,4a,5,6,8a-hexahydronaphthalene
Cas Number:
31983-21-8
Molecular formula:
C15H24
IUPAC Name:
rel-(1R,4aS,8aR)-1-isopropyl-4,7-dimethyl-1,2,4a,5,6,8a-hexahydronaphthalene
Constituent 11
Chemical structure
Reference substance name:
6-isopropyl-4,8a-dimethyl-1,2,3,7,8,8a-hexahydronaphthalene
Cas Number:
473-14-3
Molecular formula:
C15H24
IUPAC Name:
6-isopropyl-4,8a-dimethyl-1,2,3,7,8,8a-hexahydronaphthalene
Constituent 12
Chemical structure
Reference substance name:
rel-(4R,4aR)-4,4a-dimethyl-6-(prop-1-en-2-yl)-1,2,3,4,4a,7-hexahydronaphthalene
Molecular formula:
C15H22
IUPAC Name:
rel-(4R,4aR)-4,4a-dimethyl-6-(prop-1-en-2-yl)-1,2,3,4,4a,7-hexahydronaphthalene
Constituent 13
Chemical structure
Reference substance name:
rel-(1R,8aR)-1-isopropyl-4,7-dimethyl-1,2,3,5,6,8a-hexahydronaphthalene
Cas Number:
317819-82-2
Molecular formula:
C15H24
IUPAC Name:
rel-(1R,8aR)-1-isopropyl-4,7-dimethyl-1,2,3,5,6,8a-hexahydronaphthalene
Constituent 14
Reference substance name:
Likely sesquiterpine, MW 202
Molecular formula:
C15H22
IUPAC Name:
Likely sesquiterpine, MW 202
Constituent 15
Reference substance name:
Likely acetylated sesquiterpenes and acetylated sesquiterpene alcohols
IUPAC Name:
Likely acetylated sesquiterpenes and acetylated sesquiterpene alcohols
Constituent 16
Reference substance name:
Likely oxygenated sesquiterpenes
IUPAC Name:
Likely oxygenated sesquiterpenes
Constituent 17
Reference substance name:
Unknown constituent, MW 260
IUPAC Name:
Unknown constituent, MW 260
Test material form:
liquid
Specific details on test material used for the study:
ROB HB = Vetiveryl Acetate
Batch: 1590849
Refrigerated (0.5 - 8 °C)
Yellow liquid

In vivo test system

Test animals

Species:
mouse
Strain:
CBA:J
Sex:
female
Details on test animals and environmental conditions:
Groups of 5 CBA/J female mice were treated.
Age Range: 11-12 weeks old.
Body weight range: 18-25 grams on Day 1.

Housed 5 mice per cage.
12 hour light/dark.
Room temperature 23-28'C.
Animals climatised for 8 days prior to the first dose.

Harlan Teklad certified rodent Chow 7012C as libitum.
Tap water ad libitum.

Study design: in vivo (LLNA)

Vehicle:
other: Diethyl phthalate/ethanol, ratio 3:1.
Concentration:
1, 2.5, 5, 10, 25%
No. of animals per dose:
5 per dose
Details on study design:
Groups of 5 female mice were treated on the dorsal surface of both ears once per day for 3 days with the test substance or the vehicle.
On day 6, the mice were injected, i.v. with 20 uCi of 3H-thymidine in sterile saline.
Five hours later the mice were euthanised and the draining auricular lymph nodes were removed.
The lymph node cells were precipitated with 5% trichloroacetic acid and the pellets counted in a scintillation counter to determine incorporation of the 3H-thymidine.
Statistics:
The EC3 was calculated using the following formula:
EC3 = c+ [(3-d) / (b-d)] (a-c)

Results and discussion

Positive control results:
NA

In vivo (LLNA)

Resultsopen allclose all
Key result
Parameter:
SI
Value:
0.85
Variability:
Not given
Test group / Remarks:
1% - Negative
Key result
Parameter:
SI
Value:
0.93
Variability:
Not given
Test group / Remarks:
2.5% - Negative
Key result
Parameter:
SI
Value:
1.52
Variability:
Not given
Test group / Remarks:
10% - Negative
Key result
Parameter:
SI
Value:
1.12
Variability:
Not given.
Test group / Remarks:
10% - Negative
Key result
Parameter:
SI
Value:
10.18
Variability:
Not given
Test group / Remarks:
25% - Positive induction

Applicant's summary and conclusion

Interpretation of results:
Category 1B (indication of skin sensitising potential) based on GHS criteria
Conclusions:
A stimulation index greater than or equal to 3 is regarded as a positive response.
Therefore, based on the criteria of the study, treatment at 25% (v/v) did result in a stimulation index of greater than 3 and hence is considered to skin sensitising activity.
Executive summary:

The EC3 was calculated to be 13.11%