Bis(2-ethoxyethyl) ether

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:

migrated information: read-across based on grouping of substances (category approach)

Adequacy of study:

key study

Study period:

13 April 2010 - 29 April 2010

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

GLP compliant study conducted in accordance with international guidelines.The restriction is also due to the use of read across approach: the study was performed not with DEGDEE but with DEGEE, a substance which like DEGDEE is part of the diethylene glycol monoalkyl and dialkyl ethers category. These substances have been demonstrated to be similar in structure, physical/chemical properties and toxicological profile.

Qualifier:

according to guideline

Guideline:

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

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method B.42 (Skin Sensitisation: Local Lymph Node Assay)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of study:

mouse local lymph node assay (LLNA)

Species:

mouse

Strain:

CBA

Sex:

female

Details on test animals and environmental conditions:

TEST ANIMALS
- Age at study initiation: 8 - 12 weeks
- Housing: Single
- Diet (e.g. ad libitum): ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: At least 5 days prior to the start of dosing under test conditions after health examination

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 + 2°
- Humidity (%): 45-65
- Photoperiod (hrs dark / hrs light): 12/12

Vehicle:

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

Concentration:

25, 50, and 100%.

No. of animals per dose:

4

Details on study design:

MAIN STUDY
ANIMAL ASSIGNMENT AND TREATMENT
- Name of test method:Method followed OECD 429; no deviations from the guideline
- Criteria used to consider a positive response: A test item is regarded as a sensitiser in the LLNA if the exposure to one or more test
concentrations resulted in 3-fold or greater increase in incorporation of 3HTdR compared to the concurrent control, as indicated by the
stimulation index.
The estimated concentration of test item required to produce an S.I. of 3 is referred to as the EC3 value.

TREATMENT PREPARATION AND ADMINISTRATION:
Each test group of mice was treated by topical (epidermal) application to the dorsal surface of each ear (left and right) with the test item (25µl).
Five days after the first topical application, all mice were administered with 250 µl of 81.7 µCi/ml 3HTdR (corresponds to 20.4 µCi 3HTdR per mouse) by intravenous injection via a tail vein.

Positive control substance(s):

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

Statistics:

The mean values and standard deviations were calculated in the body weight tables.

Parameter:

SI

Remarks on result:

other: Test item concentration S.I. % (w/v) 25 0.73 50 1.03 100 0.69

Parameter:

other: disintegrations per minute (DPM)

Remarks on result:

other: see Remark

Remarks:

Test item Measurement DPM DPM per lymph node (b) concentration % (w/v) 25 3520 438.1 50 4984 621.1 100 3345 416.2 b) = Since the lymph nodes of the animals of a dose group were pooled, DPM/node was determined by dividing the measured value by the number of lymph nodes pooled

No deaths occurred during the study period.

No symptoms of local toxicity at the ears of the animals and no systemic findings were observed during the study period.

The body weight of the animals, recorded prior to the first application and prior to treatment with 3HTdR, was within the range commonly recorded for animals of this strain and age.

Interpretation of results:

not sensitising

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

The test item Diethylene glycol methyl ethyl ether was not a skin sensitiser under the described conditions in a Local Lymph Node Assay in Mice.

Executive summary:

DEGDEE and DEGMEE, which is in the above study tested for its skin sensitisation potential in mice, are both part of the diethylene glycol monoalkyl and dialkyl ethers category described and evaluated in the document titled "Category Approach-Read across Diethylene Glycol Diethyl Ether" (2013).

These substances have been demonstrated to be very similar in structure, physical/chemical properties and toxicological profile . Therefore, a read-across from DEGDEE to data obtained with DEGMEE is scientifically justified.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not sensitising)

Additional information:

Justification for selection of skin sensitisation endpoint:

The only study available.

Respiratory sensitisation

Endpoint conclusion

Endpoint conclusion:

no study available

Justification for classification or non-classification

A local lymph node assay was performed using Diethylene Glycol Methyl Ethyl Ether concentrations of 25, 50, and 100% in acetone:olive oil (4+1). The substance is used as read across for the classification of skin sensitisation of DEGDEE (Category Approach-Read across Diethylene Glycol Diethyl Ether, 2013). Stimulation Indices of 0.73, 1.03, and 0.69 were determined with the test item at concentrations of 25, 50, and 100% . The EC3 value could not be calculated, since none of the tested concentrations induced an S.I. greater than 3. Therefore DEGDEE is not classified as a skin sensitiser in accordance with Regulation (EC) No 1272/2008.