Phosphoric acid, mono- and dimethyl esters, compds. with C10-13-(branched)-alkylaniline

Endpoint summary

Description of key information

Skin sensitisation

Key study:

The study was performed to the standardised guidelines OECD 429, under GLP conditions. Under the conditions of the test, the test material was considered to be a weak skin sensitizer with an EC3 of 11.8% under the conditions of the test and is classified as a contact sensitizer (Category 1B) according GHS (Envigo, 2018).

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:

15 February 2018 to 05 September 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

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

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.2600 (Skin Sensitisation)

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: Japanese Ministry of Agriculture, Forestry and Fisheries (JMAFF), Testing Guidelines for Toxicology Studies, 12 NouSan No. 8147, 24 November 2000

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of study:

mouse local lymph node assay (LLNA)

Specific details on test material used for the study:

- CAS RN 1412893-77-6
- Purity: >94% (UVCB)
- Description: Brown paste to very viscous liquid

Species:

mouse

Strain:

other: CBA/CaOlaHsd

Sex:

female

Details on test animals and environmental conditions:

The animals were housed in suspended solid floor polypropylene cages with stainless steel mesh lids and furnished with softwood flakes bedding (Datesand Ltd., Cheshire, UK).

The temperature and relative humidity were set to achieve limits of 19 to 25 °C and 30 to 70%, respectively. The rate of air exchange was at least fifteen changes per hour and the lighting was controlled by a time switch to give 12 hours continuous light and 12 hours darkness.

Vehicle:

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

Concentration:

Test material at concentrations of 50, 25 or 10 (%v/v) in acetone/olive oil 4:1

No. of animals per dose:

5

Positive control substance(s):

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

Statistics:

Data was processed to give group mean values for disintegrations per minute and standard deviations where appropriate.

Positive control results:

α-Hexylcinnamaldehyde, tech., 85% was considered to be a sensitizer under the conditions of the test.

Key result

Parameter:

SI

Value:

2.51

Test group / Remarks:

10% Concentration (% v/v) in acetone/olive oil 4:1

Key result

Parameter:

SI

Value:

6.64

Test group / Remarks:

25% Concentration (% v/v) in acetone/olive oil 4:1

Key result

Parameter:

EC3

Value:

11.8

Table 1: Stimulation Index of the Test Item

Concentration (%v/v) in acetone/olive oil 4:1	Stimulation Index	Result
10	2.51	Negative
25	6.64	Positive
50	*	*

* No data, one animal found dead on Day 5 and remaining four animals humanely killed on Day 5 due to the occurrence of clinical signs of toxicity that were considered to approach/exceed the moderate severity limit set forth in the UK Home Office Project License.

Interpretation of results:

Category 1B (indication of skin sensitising potential) based on GHS criteria

Conclusions:

The test material was considered to be a weak skin sensitizer with an EC3 of 11.8% under the conditions of the test.

Executive summary:

The study was performed to the standardised guidelines OECD 429, under GLP conditions. Following a preliminary screening test in a female mouse treated with the test material at a concentration of 50% v/v in acetone/olive oil 4:1, in which no clinical signs of toxicity were noted, this concentration was selected as the highest dose investigated in the main test.

Three groups, each of five female animals, were treated with 50 μL (25 μL per ear) of the test item, as a solution in acetone/olive oil 4:1, at concentrations of 50%, 25% or 10% v/v. A further group of five female animals was treated with acetone/olive oil 4:1 alone in the same manner.

Under the conditions of the test, the test item was considered to be a weak skin sensitizer with an EC3 of 11.8% under the conditions of the test and is classified as a contact sensitizer (Category 1B) according GHS.

Endpoint conclusion

Endpoint conclusion:

adverse effect observed (sensitising)

Respiratory sensitisation

Endpoint conclusion

Endpoint conclusion:

no study available