2,4,7,9-tetramethyldec-5-yne-4,7-diol

Endpoint summary

Key value for chemical safety assessment

Skin sensitisation

Link to relevant study records

Reference

Endpoint:

skin sensitisation: in vivo (LLNA)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2012

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: according to EC Directive 92/69/EEC and Regulation EC/440/2008 guideline methods under GLP conditions

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)

Species:

mouse

Strain:

CBA

Sex:

female

Details on test animals and environmental conditions:

The animals were individually housed in suspended solid-floor polypropylene cages
furnished with softwood woodflakes. Free access to mains tap water and food (2014C
Teklad Global Rodent diet supplied by Harlan Laboratories UK Ltd., Oxon, UK) was
allowed throughout the study.
The temperature and relative humidity were controlled to remain within target ranges of
19 to 25°C and 30 to 70%, respectively. Any occasional deviations from these targets
were considered not to have affected the purpose or integrity of the study. The rate of
air exchange was approximately fifteen changes per hour and the lighting was controlledby a time switch to give twelve hours continuous light (06.00 to 18.00) and twelve hours darkness.
The animals were provided with environmental enrichment items which were considered
not to contain any contaminant of a level that might have affected the purpose or integrity
of the study.

Vehicle:

acetone/olive oil (4:1 v/v)

Concentration:

50%
25%
10%

No. of animals per dose:

5 mice

Details on study design:

The mice were treated by daily application of 25 μl of the
appropriate concentration of the test item to the dorsal surface of each ear for three
consecutive days (Days 1, 2, 3). The test item formulation was administered using an
automatic micropipette and spread over the dorsal surface of the ear using the tip of the
pipette.

Positive control substance(s):

hexyl cinnamic aldehyde (CAS No 101-86-0)

Positive control results:

alpha-Hexylcinnamaldehyde, 85% was considered to be a sensitiser under the conditions of the test.

Parameter:

other: disintegrations per minute (DPM)

Remarks on result:

other: Vehicle: 1817.54 (+/- 657.13) dpm/Animal 10%: 3037.60 (+/-1145.05) dpm/Animal 25%: 5009.25 (+/-639.45) dpm/Animal 50%: 6698.23 (+/-2082.90) dpm/Animal

Key result

Parameter:

SI

Value:

1.67

Test group / Remarks:

10 %

Key result

Parameter:

SI

Value:

2.76

Test group / Remarks:

25 %

Key result

Parameter:

SI

Value:

3.69

Test group / Remarks:

50 %

Interpretation of results:

sensitising

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

The test item was considered to be a sensitiser under the conditions of the test.

Executive summary:

The test item was considered to be a sensitiser under the conditions of the test.

Endpoint conclusion

Endpoint conclusion:

adverse effect observed (sensitising)

Additional information:

The Stimulation Index expressed as the mean radioactive incorporation for

each treatment group divided by the mean radioactive incorporation of the vehicle control

group has been 3.69 at 50 % concentration.

Migrated from Short description of key information:
Sensitizer according to OECD TG 429

Justification for selection of skin sensitisation endpoint:
Only one study on this substance available. Most recent study on substance according to OECD TG 429, which meets the criteria set forth in Regulation EC No. 440/2008 for filling REACH endpoints. The data is generated in a reliable laboratory using established protocols.

Respiratory sensitisation

Endpoint conclusion

Endpoint conclusion:

no study available

Justification for classification or non-classification

According to the UN Globally Harmonized System of Classification and Labelling of Chemicals (GHS) Part 3 Chapter 3.4 this substance is causing concern to be sensitizing.