Amides, coco, N,N-bis(hydroxyethyl); C10-12 and C18-unsatd. DEA

Endpoint summary

Description of key information

Based on the result of the read across substance, C8-18 and C18-unsatd. DEA, the test substance, C10-12 and C18-unsatd. DEA can be considered to be non-sensitising to skin.

Key value for chemical safety assessment

Skin sensitisation

Link to relevant study records

Reference

Endpoint:

skin sensitisation: in vivo (non-LLNA)

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Study period:

Not reported

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Justification for type of information:

Refer to section 13 for details on the read-across justification. The study with the read across substance is considered sufficient to fulfil the information requirements as further explained in the provided endpoint summary.

Reason / purpose for cross-reference:

read-across source

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 406 (Skin Sensitisation)

Deviations:

not specified

Principles of method if other than guideline:

The method employed in this study for the detection of delayed contact hypersensitivity was the guineo-pig maximization test described by Magnusson B and Kligman AM (1970) in "Allergic Contact Dermatitis in the Guinea-Pig: Identification of contact allergens", published by C. C. Thomas, Springfield, Illinois, U. S.A.

GLP compliance:

not specified

Type of study:

guinea pig maximisation test

Justification for non-LLNA method:

A valid GMPT study was available before REACH came into force, therefore no additional LLNA study was conducted.

Species:

guinea pig

Strain:

Pirbright-Hartley

Sex:

female

Details on test animals and environmental conditions:

TEST ANIMALS
- Average weight at study initiation: 440 g

Route:

intradermal

Vehicle:

other: Propylene glycol

Concentration / amount:

induction: Intradermal injection - Site 1) 0.1 ml Freund's adjuvant; site 2) 0.1 ml of a 5% solution of test substance in propylene glycol; site 3) 0.1 ml of a 1:1 mix of Freund's adjuvant and 5% test substance solution
Challenge: After 1 week, 5% test substance in vaseline (occlusive patch for 48 h); after 14 days 25% test substance in vaseline (open application)

Route:

epicutaneous, occlusive

Vehicle:

other: Propylene glycol

Concentration / amount:

Induction: Intradermal injection - Site 1) 0.1 ml Freund's adjuvant; site 2) 0.1 ml of a 5% solution of test substance in propylene glycol; site 3) 0.1 ml of a 1:1 mix of Freund's adjuvant and 5% test substance solution
Challenge: After 1 week, 5% test substance in vaseline (occlusive patch for 48 h); after 14 days 25% test substance in vaseline (open application)

No. of animals per dose:

20

Details on study design:

MAIN STUDY
A. INDUCTION EXPOSURE
- No. of exposures: 1
- Test groups: 20
- Control group: 20
- Site: both sites of the spinal cord at the level of the shoulder blades

B. CHALLENGE EXPOSURE
- No. of exposures: once, one week after induction, then again 14 days later (re-challenge)
- Exposure period: after one week; exposure over the injection sites via occlusive patch for 48 h; after 14 days: open application on right flank
- Evaluation (h after challenge): Animals observed after induction and challenge, up until 72 h after re-challenge (at 14 days)

Challenge controls:

Identical to test group.

Positive control substance(s):

no

Positive control results:

Intracutaneous application of Freund's adjuvant caused strong skin reddening, skin swelling and later necrosis and scarring

Key result

Reading:

other: After removal of the occlusive patch

Hours after challenge:

48

Group:

test chemical

Dose level:

5% test substance in vaseline

No. with + reactions:

0

Total no. in group:

20

Clinical observations:

No specific skin reactions

Key result

Reading:

rechallenge

Hours after challenge:

24

Group:

test chemical

Dose level:

25% test substance in vaseline

No. with + reactions:

0

Total no. in group:

20

Clinical observations:

None

Key result

Reading:

rechallenge

Hours after challenge:

24

Group:

negative control

Dose level:

0% test substance

No. with + reactions:

0

Total no. in group:

20

Clinical observations:

None

Key result

Reading:

rechallenge

Group:

positive control

Remarks on result:

not measured/tested

Interpretation of results:

other: CLP criteria not met

Remarks:

(non-sensitising)

Conclusions:

Under the study conditions, the test substance did not produce any evidence of delayed contact hypersensitivity and was therefore considered non-sensitizing.

Executive summary:

A study was performed to determine the delayed contact hypersensitivity potential of the read across substance, C8-18 and C18-unsatd. DEA, in 20 female Pilbright guinea-pigs, according to OECD Guideline 406 (GPMT: guinea pig maximisation test). The procedure consisted of two parts: induction and challenge exposures. For induction, three sets of intradermal injections were given (0.1 ml Freund's adjuvant; 0.1 ml of a 5% solution of test substance in propylene glycol, and 0.1 ml of a 1:1 mix of Freund's adjuvant and 5% test substance. One week after the injections, a 5% test solution was placed on the skin over the injection sites via an occlusive patch and left for 48 h. This was followed by a re-challenge: 14 d after the cutaneous exposure, 25% test substance in vaseline was placed on the skin of the right flank (open application). Under the study conditions, the read across substance did not produce any evidence of delayed contact hypersensitivity and was therefore considered non-sensitizing (Potokar, 1982). Based on the results of the read across study, the test substance, C10-12 and C18-unsatd. DEA, can also be considered to be non-sensitizing in GPMT test.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not sensitising)

Additional information:

Based on the results of the read across study, the test substance, C10-12 and C18 -unsatd. DEA, is considered to be non-sensitsing to skin.

Respiratory sensitisation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information:

A study was performed to determine the delayed contact hypersensitivity potential of the read across substance, C8-18 and C18-unsatd. DEA, in 20 female Pilbright guinea-pigs, according to OECD Guideline 406 (GPMT: guinea pig maximisation test). The procedure consisted of two parts: induction and challenge exposures. For induction, three sets of intradermal injections were given (0.1 ml Freund's adjuvant; 0.1 ml of a 5% solution of test substance in propylene glycol, and 0.1 ml of a 1:1 mix of Freund's adjuvant and 5% test substance. One week after the injections, a 5% test solution was placed on the skin over the injection sites via an occlusive patch and left for 48 h. This was followed by a re-challenge: 14 d after the cutaneous exposure, 25% test substance in vaseline was placed on the skin of the right flank (open application). Under the study conditions, the read across substance did not produce any evidence of delayed contact hypersensitivity and was therefore considered non-sensitizing (Potokar, 1982). Based on the results of the read across study, the test substance, C10-12 and C18-unsatd. DEA, can also be considered to be non-sensitizing in GPMT test.

Justification for classification or non-classification

Based on the results of the read across GPMT study, the test substance, C10-12 and C18-unsatd. DEA, is concluded not to warrant classification for skin sensitisation, according to the EU CLP criteria (Regulation 1272/2008/EC).