2-ethylcyclopentane-1,3-dione

Skin sensitisation

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:

other: Well documented study according to international accepted guidelines and GLP compliant.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2014

Report date:

2014

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 429 (Skin Sensitisation: Local Lymph Node Assay)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of study:

mouse local lymph node assay (LLNA)

Test material

Test material information

Constituent 1

Reference substance name:

2-ethylcyclopentane-1,3-dione

EC Number:

212-512-3

EC Name:

2-ethylcyclopentane-1,3-dione

Cas Number:

823-36-9

Molecular formula:

C7H10O2

IUPAC Name:

2-ethylcyclopentane-1,3-dione

Test material form:

solid: crystalline

Details on test material:

Test item: Ethyl-cyclopentanedioneCAS number: 823-36-9Batch number: S41196NPhysical state: Solid, crystalline substanceColuor: Almost whiteActive ingredient content (Calculated): 93.7%Storage: At a temperature of 15 to 30 °C

In vivo test system

Test animals

Details on test animals and environmental conditions:

Species and strain: CBA/Ca Ola Hsd miceSource: TOXI-COOP ZRT.Hygienic level at arrival: SPFHygienic level during the study: Good conventionalNumber of animals: 24 animals/main test (4 animals/treatment group)Sex: Female, nulliparous, non-pregnantAge of animals: Young adult mice; 10-11 weeks old (at start of the main test)Body weight range at starting: 17.8-23.6 gAcclimatization time: 14 daysAnimal health: Only healthy animals were usedHousing during acclimatization period: Grouped caging in small groupsHousing during the test: Grouped caging (4 animals/cage)Light: 12 hours daily, from 6.00 a.m. to 6.00 p.m.Temperature: 22 ± 3 °CRelative humidity: 30 – 70 %

Study design: in vivo (LLNA)

Vehicle:

dimethylformamide

Remarks:

AOO (acetone:olive oil, 4:1) for positive control

Concentration:

The test item was administered at three different concentrations (25; 10; 5 w/v%) according to the results of the dose range finding test.

No. of animals per dose:

4 animal/dose

Details on study design:

Selection of test item concentrations was based on the results of a formulation evaluation and also results of preliminary irritation/toxicity test to find an appropriate solvent and the maximum applicable concentration according to the relevant guidelines. Based on the preliminary test results the test item was examined in the main test at 25 %, 10 % and 5 % (w/v) concentrations as formulations in the selected vehicle of N,N-Dimethylformamide (DMF). Appropriate positive control (α-Hexylcinnamaldehyde [HCA] in 25 % (w/v) concentration), furthermore two negative control groups dosed with the vehicles of the test and positive control groups, respectively, were employed.The positive control item (25 % (w/v) HCA in Acetone: Olive oil 4:1 (v/v) mixture, AOO) induced the appropriate stimulation over the control, thus confirming the validity of the assay.

Positive control substance(s):

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

Results and discussion

In vivo (LLNA)

Results

Results 1

Parameter:

SI

Remarks on result:

other: see Remark

Remarks:

The stimulation index (SI = the DPN of a treated (positive control or test item) group divided by the DPN of the respective negative control group) for each treatment group was also calculated. A stimulation index of 3 or greater is an indication of a positive result. When monotonic dose-response is seen, attempt is made to calculate EC3 (dose calculated to induce a stimulation index of 3) with the help of linear regression on dose-response relationship. All calculations were made by Microsoft Excel Software. (See Table1 for the values.)

Results 2

Parameter:

other: disintegrations per minute (DPM)

Remarks on result:

other: see Remark

Remarks:

DPM (disintegration per minute) was measured for each treatment group. The measured DPM values were corrected with the background DPM value. The average of the two measured DPM values of 5 % (w/v) TCA solutions was used as the background DPM value. The results were expressed as DPN (DPM divided by the number of pooled lymph nodes). (See Table1 for the values.)

Results 3

Parameter:

SI

Value:

1.5

Remarks on result:

other: Ethyl-cyclopentanedione 10% in DMF

Results 4

Parameter:

SI

Value:

0.9

Remarks on result:

other: Ethyl-cyclopentanedione 5% in DMF

Results 5

Parameter:

SI

Value:

1

Remarks on result:

other: Ethyl-cyclopentanedione 25% in DMF

Any other information on results incl. tables

Test Group Name	Measured DPM/group	Group* DPM	DPN (DPM/Node)	Stimulation Index Values
Vehicle control for the positive control: AOO	18071	18050.0	2256.3	1.0
Positive control: 25 % HCA in AOO	86012	85991.0	10748.9	4.8
Ethyl-cyclopentanedione 25 % in DMF	3957	3936.0	492	1.0
Ethyl-cyclopentanedione 10 % in DMF	5871	5850.0	731.3	1.5
Ethyl-cyclopentanedione 5 % in DMF	3650	3629.0	453.6	0.9
Vehicle control for the test item: DMF	4019	3998.0	499.8	1.0

 *Group DPM = measured DPMgroup- average DPMbackground

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Remarks:

Migrated information

Conclusions:

In conclusion, under the conditions of the present Local Lymph Node Assay, Ethyl-cyclopentanedione (CAS No. 823-36-9) tested at the maximum attainable concentration of 25 % (based on solubility) and at concentrations of 10 % and 5 % (w/v) as formulations in an appropriate vehicle (DMF) was shown to have no skin sensitization potential.