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Description of key information

Based on a Weight of Evidence approach, the substance is predicted to be a non-sensitiser.

Key value for chemical safety assessment

Skin sensitisation

Link to relevant study records

Referenceopen allclose all

Endpoint:
skin sensitisation: in vivo (non-LLNA)
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment
Justification for type of information:
This endpoint record is part of a Weight of Evidence approach comprising an in vivo study (this record) and two QSAR predictions. All data sources agree in the estimated skin sensitization potential (i.e., non-sensitizing according to EC 1272/2008 as amended) as further explained in the provided endpoint summary.
Reason / purpose for cross-reference:
reference to other study
Remarks:
part of a Weight of Evidence approach
Reason / purpose for cross-reference:
reference to other study
Remarks:
part of a Weight of Evidence approach
Reason / purpose for cross-reference:
reference to same study
Remarks:
skin irritation results
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 406 (Skin Sensitisation)
GLP compliance:
no
Type of study:
intracutaneous test
Justification for non-LLNA method:
The guinea pig skin sensitization test results were existing data and were not commissioned for the purposes of REACH.
Specific details on test material used for the study:
Haskell No. 9864
Species:
guinea pig
Strain:
not specified
Sex:
male
Details on test animals and environmental conditions:
Albino males
Route:
intradermal
Vehicle:
other: saline
Concentration / amount:
0.1 mL of a 1% solution (wt/vol) of test material in 0.9% saline
Day(s)/duration:
3 wks
Adequacy of induction:
not specified
Route:
intradermal
Vehicle:
propylene glycol
Concentration / amount:
0.05 mL each of a 50% and a 5% suspension (wt/vol) of test material in propylene glycol
Day(s)/duration:
48 hours
Adequacy of challenge:
not specified
No. of animals per dose:
9
Details on study design:
To test for the sensitization potential, a series of four sacral intradermal injections was given, one each week over a three-week period, which consisted of 0.1 ml of a 1% solution (wt/vol) of test material in 0.9% saline. Following a two-week rest period, the test animals were challenged for sensitization by applying, and lightly rubbing in 1 drop (approx. 0.05 mL) each of a 50% and a 5% suspension (wt/vol) of test material in propylene glycol on the shaved intact shoulder skin. A group of 10 previously unexposed guinea pigs received similar applications at the time of challenge to provide a direct comparison of the challenge reactions on skin of similar age.
Challenge controls:
A group of 10 previously unexposed guinea pigs received similar applications at the time of challenge to provide a direct comparison of the challenge reactions on skin of similar age.
Reading:
2nd reading
Hours after challenge:
24
Group:
test chemical
Dose level:
50% suspension (wt/vol)
No. with + reactions:
3
Total no. in group:
6
Reading:
2nd reading
Hours after challenge:
48
Group:
test chemical
Dose level:
50% suspension (wt/vol)
No. with + reactions:
0
Total no. in group:
9
Reading:
2nd reading
Hours after challenge:
24
Group:
test chemical
Dose level:
5% suspension (wt/vol)
No. with + reactions:
0
Total no. in group:
9
Reading:
2nd reading
Hours after challenge:
48
Group:
test chemical
Dose level:
5% suspension (wt/vol)
No. with + reactions:
0
Total no. in group:
9
Reading:
2nd reading
Hours after challenge:
24
Group:
negative control
Dose level:
5% suspension (wt/vol)
No. with + reactions:
0
Total no. in group:
0
Reading:
2nd reading
Hours after challenge:
48
Group:
negative control
Dose level:
50% suspension (wt/vol)
No. with + reactions:
0
Total no. in group:
0
Reading:
2nd reading
Hours after challenge:
24
Group:
positive control
Dose level:
5% suspension (wt/vol)
No. with + reactions:
0
Total no. in group:
0
Reading:
2nd reading
Hours after challenge:
48
Group:
positive control
Dose level:
50% suspension (wt/vol)
No. with + reactions:
0
Total no. in group:
0
Interpretation of results:
study cannot be used for classification
Remarks:
part of a Weight of Evidence approach as further explained in the provided endpoint summary
Conclusions:
The test material produced mild irritation in three test guinea pigs and one control guinea pig when applied at challenge to the shaved intact skin of male albino guinea pigs as a 50% suspension in propylene glycol. No irritation was produced by a 5% suspension. No sensitization was observed at challenge; however, the material is a mild skin irritant. However, this study has limitations: induction did not have 3 pairs of intradermal injections and did not have topical application. Also, it is unclear whether the highest induction dose was the highest to cause mild to moderate skin irritation. Coverage information was not provided, and skin reaction observed during the induction period was not reported.
Endpoint:
skin sensitisation: in vitro
Type of information:
(Q)SAR
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model, but not (completely) falling into its applicability domain, with adequate and reliable documentation / justification
Justification for type of information:
This endpoint record is part of a Weight of Evidence approach comprising an in vivo study and two QSAR predictions (one of which is this record). All data sources agree in the estimated skin sensitization potential (i.e., non-sensitizing according to EC 1272/2008 as amended) as further explained in the provided endpoint summary.
Reason / purpose for cross-reference:
reference to other study
Remarks:
part of a Weight of Evidence approach
Reason / purpose for cross-reference:
reference to other study
Remarks:
part of a Weight of Evidence approach
Guideline:
other: QSAR prediction
Principles of method if other than guideline:
Times v.2.28.1.6
Toolbox prediction report is attached in IUCLID
GLP compliance:
no
Specific details on test material used for the study:
Smiles: O=[N+]1C(C2CCC(N1[O-])(CC2)C)(C)C
Parameter:
other: QSAR skin sensitization model
Remarks on result:
no indication of skin sensitisation
Interpretation of results:
study cannot be used for classification
Remarks:
part of a Weight of Evidence approach as further explained in the provided endpoint summary
Conclusions:
The test substance is predicted to be a non-sensitiser.
Executive summary:

The Times model for skin sensitisation was used. The test substance is predicted to be a non-sensitiser. Additional supporting documentation is provided in the prediction report attached in IUCLID.

Endpoint:
skin sensitisation: in vitro
Type of information:
(Q)SAR
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model, but not (completely) falling into its applicability domain, with adequate and reliable documentation / justification
Justification for type of information:
This endpoint record is part of a Weight of Evidence approach comprising an in vivo study and two QSAR predictions (one of which is this record). All data sources agree in the estimated skin sensitization potential (i.e., non-sensitizing according to EC 1272/2008 as amended) as further explained in the provided endpoint summary.
Reason / purpose for cross-reference:
reference to other study
Remarks:
part of a Weight of Evidence approach
Reason / purpose for cross-reference:
reference to other study
Remarks:
part of a Weight of Evidence approach
Guideline:
other: QSAR prediction
Principles of method if other than guideline:
BIOVIA Discovery Studio v4.5
Prediction report is attached in IUCLID
GLP compliance:
no
Specific details on test material used for the study:
SMILES: O=[N+]1C(C2CCC(N1[O-])(CC2)C)(C)C
Parameter:
other: QSAR skin sensitisation
Remarks on result:
no indication of skin sensitisation
Interpretation of results:
study cannot be used for classification
Remarks:
part of a Weight of Evidence approach as further explained in the provided endpoint summary
Conclusions:
The test substance is predicted to be a non-sensitiser.
Executive summary:

The BIOVIA model for skin sensitisation was used. The test substance is predicted to be a non-sensitiser. Additional supporting documentation is provided in the prediction report attached in IUCLID.

Endpoint conclusion
Endpoint conclusion:
no adverse effect observed (not sensitising)
Additional information:

Skin sensitisation was assessed as part of a Weight of Evidence approach comprising an in vivo study and two QSAR predictions. The in vivo study has limitations: induction did not have 3 pairs of intradermal injections and did not have topical application; unclear whether the highest induction dose was the highest to cause mild to moderate skin irritation; coverage information was not provided; and skin reaction observed during the induction period was not reported. This in vivo study reported that no sensitization was observed at challenge. The BIOVIA model for skin sensitisation predicted the test substance to be a non-sensitizer. The TIMES model for skin sensitisation predicted the test substance to be a non-sensitizer.

Based on a Weight of Evidence comprising an in vivo study and two QSAR predictions, TAOBN can be conservatively considered to be a non-skin sensitizer which does not meet the criteria for classification as a skin sensitizer according to CLP (EC 1272/2008 as amended).

Respiratory sensitisation

Endpoint conclusion
Endpoint conclusion:
no study available

Justification for classification or non-classification

Based on a Weight of Evidence approach, the substance is predicted to be a moderate eye irritant meeting the criteria for classification as an eye irritant Category 2 according to CLP (EC 1272/2008 as amended).