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Administrative data

Description of key information

Not sensitising in a Buehler assay

Key value for chemical safety assessment

Skin sensitisation

Link to relevant study records
Reference
Endpoint:
skin sensitisation: in vivo (non-LLNA)
Remarks:
Buehler test; predates Commission Regulation EU 2016/1688 and Regulation EC No. 1907/2006
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Comparable to guideline study with acceptable restrictions. Only limited study documentation, vehicle is corn oil, both flanks were exposed during challange
Justification for type of information:
The analogue approach is used for the hazard assessment of toxicological endpoints for the registration of the target substance trimethylolpropane ricinoleate (CAS 68551-65-5) based on generation of different breakdown/metabolic products, resulting not only in similar physical and biological systems (Scenario 2 of the Read-Across Assessment Framework (RAAF, ECHA, 2015), but also consequently in similar physico-chemical and toxicological properties. The source compounds for read-across are fatty acids, C16-18, esters with pentaerythritol (CAS 85116-93-4) and pentaerythritol ricinoleate (CAS 78-22-8). It is proposed that the different alcohols resulting from ester hydrolysis of the source compounds and the target substance will not result in significant variation in biological effects.
Neither target nor source compounds are classified for mammalian hazardous effects. The use of reliable experimental data, all evaluated as reliable according to Klimisch scores of 1 or 2, to estimate the toxicity of the registered substance is adequate for the purposes of fulfilling the data requirements of registration and classifying potential hazards. Similar grouping into categories has been accepted by other regulatory agencies (U.S. EPA, 2010; U.S. FDA for food notifications). Thus, this read-across approach is adequate for the purposes of risk assessment and classification and labeling.
Reason / purpose for cross-reference:
read-across source
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 406 (Skin Sensitisation)
Deviations:
yes
Remarks:
Vehicle is corn oil, both flanks were exposed during challange
GLP compliance:
not specified
Type of study:
Buehler test
Justification for non-LLNA method:
Predates Commission Regulation EU No. 2106/1688 and preference by REACH regulation/ECHA guidance for LLNA
Species:
guinea pig
Strain:
other: Albino
Sex:
male
Details on test animals and environmental conditions:
TEST ANIMALS
- Weight at study initiation: 344-441 g
Route:
epicutaneous, occlusive
Vehicle:
corn oil
Concentration / amount:
Induction: 100%
Day(s)/duration:
3 applications (6 h each)
Adequacy of induction:
not specified
No.:
#1
Route:
epicutaneous, occlusive
Vehicle:
corn oil
Concentration / amount:
Challenge: 30% and 100%
Day(s)/duration:
1 day (6 h)
Adequacy of challenge:
not specified
No. of animals per dose:
20 (10 for the controls)
Details on study design:
RANGE FINDING TESTS: No Data

MAIN STUDY
A. INDUCTION EXPOSURE
- No. of exposures: 3
- Exposure period: 6 h
- Test groups: Undiluted test sample
- Control group: Not stated, but very likely the control group recieved vehicle only.
- Site: scapular region
- Frequency of applications: 7 d interval
- Duration: 14 d
- Concentrations: undiluted

B. CHALLENGE EXPOSURE
- No. of exposures: 1
- Day(s) of challenge: day 28, 14 d after final induction
- Exposure period: 6 h
- Test groups: undiluted (100%) and 30% (w/v in corn oil)
- Control group: undiluted (100%) and 30% (w/v in corn oil)
- Site: undiluted (100%) on left flank and 30% on right flank
- Concentrations: undiluted (100%) and 30% (w/v in corn oil)
- Evaluation (hr after challenge): 24 h and 48 h
Challenge controls:
No
Positive control substance(s):
no
Key result
Reading:
1st reading
Hours after challenge:
24
Group:
negative control
Dose level:
0
No. with + reactions:
0
Total no. in group:
10
Remarks on result:
other: Reading: 1st reading. . Hours after challenge: 24.0. Group: negative control. Dose level: 0. No with. + reactions: 0.0. Total no. in groups: 10.0.
Key result
Reading:
1st reading
Hours after challenge:
24
Group:
test chemical
Dose level:
30%
No. with + reactions:
0
Total no. in group:
20
Remarks on result:
other: Reading: 1st reading. . Hours after challenge: 24.0. Group: test group. Dose level: 30%. No with. + reactions: 0.0. Total no. in groups: 20.0.
Key result
Reading:
1st reading
Hours after challenge:
24
Group:
test chemical
Dose level:
100%
No. with + reactions:
0
Total no. in group:
20
Remarks on result:
other: Reading: 1st reading. . Hours after challenge: 24.0. Group: test group. 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:
0
No. with + reactions:
0
Total no. in group:
10
Remarks on result:
other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: negative control. Dose level: 0. No with. + reactions: 0.0. Total no. in groups: 10.0.
Key result
Reading:
2nd reading
Hours after challenge:
48
Group:
test chemical
Dose level:
30%
No. with + reactions:
0
Total no. in group:
20
Remarks on result:
other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: test group. Dose level: 30%. No with. + reactions: 0.0. Total no. in groups: 20.0.
Key result
Reading:
2nd reading
Hours after challenge:
48
Group:
test chemical
Dose level:
100%
No. with + reactions:
0
Total no. in group:
20
Remarks on result:
other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: test group. Dose level: 100%. No with. + reactions: 0.0. Total no. in groups: 20.0.
Interpretation of results:
GHS criteria not met
Conclusions:
The analogue test substance was not sensitising in an OECD 406 (Buehler) protocol in guinea pigs. These data apply to the target (registered) substance, and are adequate for filling data requirements of REACH and for risk assessment.
Endpoint conclusion
Endpoint conclusion:
no adverse effect observed (not sensitising)

Respiratory sensitisation

Endpoint conclusion
Endpoint conclusion:
no study available
Additional information:

The analogue test substance was not sensitising in an OECD 406 (Buehler) protocol in guinea pigs.  These data apply to the target (registered) substance, and are adequate for filling data requirements of REACH.

Justification for classification or non-classification

The experimental findings on the analogue substance do not meet the criteria for classification in Regulation EC No. 1272/2008.

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