Reaction mass of 1,3-dioxane-5,5-dimethanol and 1,3-Propanediol, 2-(hydroxymethyl)-2-[(methoxymethoxy)methyl]-

Skin sensitisation

Administrative data

Endpoint:

skin sensitisation: in vivo (LLNA)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

29th September 2009 - 26th January 2010.

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: The study was conducted according to the relevant OECD guidelines (OECD guideline 429) and is compliant with GLP.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2009

Report date:

2010

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

Test material information

Constituent 1

Reference substance name:

Polyol PX

IUPAC Name:

Polyol PX

Test material form:

other: solid

Details on test material:

- Name of test material (as cited in study report): Polyol PX
- Molecular formula (if other than submission substance): Not documented
- Molecular weight (if other than submission substance): Not documented
- Smiles notation (if other than submission substance): Not documented
- InChl (if other than submission substance): Not documented
- Structural formula attached as image file (if other than submission substance): see Fig. Not documented
- Substance type: Not documented
- Physical state: Amber waxy solid
- Analytical purity: Not documented
- Impurities (identity and concentrations): Not documented
- Composition of test material, percentage of components: Not documented
- Isomers composition: Not documented
- Purity test date: Not documented
- Lot/batch No.: 391191549 (B)
- Expiration date of the lot/batch: 15th May 2014
- Radiochemical purity (if radiolabelling): 98.7%
- Specific activity (if radiolabelling): Not documented
- Locations of the label (if radiolabelling): Not documented
- Expiration date of radiochemical substance (if radiolabelling): Not documented
- Stability under test conditions: Not documented
- Storage condition of test material: Kept refrigerated in the dark.
- Other: pH of the formulation was pH 7.

In vivo test system

Test animals

Species:

mouse

Strain:

other: CBA/Ca

Sex:

female

Details on test animals and environmental conditions:

TEST ANIMALS
- Source: Charles River UK Limited, Manston Road, Margate, Kent, UK
- Age at study initiation: 7 to 8 weeks old
- Weight at study initiation: 15.2 to 18.9 g
- Housing: The animals were housed in groups of 2 or 3 in cages.
- Diet (e.g. ad libitum): Rat and Mouse No. 1 Maintenance Diet ad libitum.
- Water (e.g. ad libitum): Water from Public Supply ad libitum.
- Acclimation period: The animals were acclimatised for at least 8 days prior to the start of dosing.


ENVIRONMENTAL CONDITIONS
- Temperature (°C): 21 - 22°C
- Humidity (%): 47 - 61%
- Air changes (per hr): A minimum of 15 air changes per hour.
- Photoperiod (hrs dark / hrs light): A 12 hours dark / 12 hours light cycle was in operation.


IN-LIFE DATES: From: 14th October 2009 To: 29th October 2009.

Study design: in vivo (LLNA)

Vehicle:

dimethylformamide

Concentration:

The formulation concentrations used were 10%, 25% and 50%.

No. of animals per dose:

Five female mice per dose were used.

Details on study design:

MAIN STUDY
ANIMAL ASSIGNMENT AND TREATMENT
- Name of test method: Local Lymph Node Assay
- Criteria used to consider a positive response: A response will be considered to be positive should a Stimulation Index of ≥ 3 be obtained.

TREATMENT PREPARATION AND ADMINISTRATION:
For each formulation the appropriate amount of Polyol PX was weighed and transferred to a glass container. The control, dimethylformamide (DMF) was added and the mixture was stirred using a magnetic stirrer until the formulations were visibly homogenous.

The appropriate amount of DMF was also dispensed for administration to the vehicle control group.

The test item was administered by a single open application of 25μL of the appropriate application concentration (0, 10, 25 or 50%) into the dorsum of each ear for 3 consecutive days (Days 1 - 3). The test animals received no treatment on Days 4 and 5. On Day 6, each animal was administered with 25μL phosphate buffered saline (PBS) containing approximately 19μCi of [methyl-3H] thymidine into the lateral tail vein by intravenous injection.

5 hours after intravenous administration, the animals were killed and the major blood vessels severed. Each pair of draining auricular lymph nodes was collected from each animal. A single cell suspension of lymph node cells was prepared from each paired sample, by gentle disaggregation. The lymph node cells were washed in PBS and centrifuged.

Positive control substance(s):

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

Statistics:

No formal statistical analyses were conducted and are not required.

Results and discussion

Positive control results:

The Stimulation Indices in a recent positive control study were 1.7, 2.4 and 5.0 for 5%, 10% and 25% hexylcinnamicaldehyde, respectively.

In vivo (LLNA)

Results

Results 1

Parameter:

SI

Value:

1

Test group / Remarks:

Control group

Results 2

Parameter:

SI

Value:

0.9

Test group / Remarks:

Dose group Low: concentration formulation 10%.

Results 3

Parameter:

SI

Value:

0.9

Test group / Remarks:

Dose group Middle: concentration formulation 25%.

Results 4

Parameter:

SI

Value:

1.1

Test group / Remarks:

Dose group High: concentration formulation 50%.

Results 5

Parameter:

other: disintegrations per minute (DPM)

Value:

2 715

Remarks on result:

other: Control group

Results 6

Parameter:

other: disintegrations per minute (DPM)

Value:

2 348

Test group / Remarks:

Dose group Low: concentration formulation 10%

Results 7

Parameter:

other: disintegrations per minute (DPM)

Value:

2 515

Test group / Remarks:

Dose group Middle: concentration formulation 25%.

Results 8

Parameter:

other: disintegrations per minute (DPM)

Value:

2 879

Test group / Remarks:

Dose group High: concentration formulation 50%.

Any other information on results incl. tables

Individual Mean and Group Mean Scintillation Counts (DPM)

Treatment                      Dimethylformamide                                Polyol PX

Group                                          1                          2                       3                     4

Concentration (%)                         0                         10                     25                   50

 

Group	Animal	DPM	Group Mean DPM	Stimulation Index
1	1 2 3 4 5	2723 1865 3385 3695 1909	2715	1
2	6 7 8 9 10	711 4586 2258 1363 2823	2348	0.9
3	11 12 13 14 15	2467 2550 1871 3513 2176	2515	0.9
4	16 17 18 19 20	2304 3341 3475 3747 1527	2879	1.1

There were no signs of systemic toxicity noted in any animal during the observation period.

The changes in body weight (body weight gain) were considerd to be within the normal range for mice of this age and strain.

Applicant's summary and conclusion

Interpretation of results:

not sensitising

Remarks:

Criteria used for interpretation of results: EU

Conclusions:

Under the conditions of the study, treatment with Polyol PX at concentrations of up to 50% did not result in a stimulation index of greater than / equal to 3, meaning the test item is not considered to have the potential to cause sensitisation. Consequently, it does not require classification as a skin sensitiser according to CLP.

Executive summary:

Three groups of five female mice received an open application of 25uL of the test substance, Polyol PX, at three concentrations, specifically 10%, 25% and 50%, for three consecutive days (test days 1 - 3). One group of five females received only the vehicle, dimethylformamide. Three days after the final application (test day 6), each animal was intravenously injected with [methyl-3H] thymidine into the lateral tail vein and after five hours, the draining lymph nodes were collected. There were no systemic signs of toxicity noted in any animal during the observation period and changes in body weight were considered to be acceptable for this age and strain of mice. The stimulation index (SI) values for the mice treated with the test substance at 10%, 25% and 50% concentrations were 0.9, 0.9 and 1.1, respectively. Under the conditions of this study, it was determined that Polyol PX does not have the potential to cause sensitisation as treatment with Polyol PX did not achieve a stimulation index of ≥3 at concentrations of up to 50%. As a result of this, it was concluded that Polyol PX did not meet the criteria for classification as a skin sensitiser according to CLP.