Phosphonic acid, P-2-propen-1-yl-, diethyl ester

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:

experimental study

Adequacy of study:

key study

Study period:

14 Jan 2015 to 06 Mar 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: study according to the guidelines under GLP

Qualifier:

according to guideline

Guideline:

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

Qualifier:

according to guideline

Guideline:

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

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
- Strain: CBA/CaCrl
- Source: Charles River (UK), Kent, UK
- Age at study initiation: 8-12 weeks
- Weight at study initiation: 15 - 23 g,
- Housing: individually in solid-floor polypropylene cages
- Diet: 2014C Teklad Global Rodent diet ad libitum
- Water: tap water ad libitum
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19 - 25°C
- Humidity (%): 30-70
- Air changes (per hr): ca 15
- Photoperiod (hrs dark / hrs light): 12/12

Vehicle:

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

Concentration:

0, 25, 50 and 100%

No. of animals per dose:

4/dose

Details on study design:

RANGE FINDING TESTS:
- dose: 25, 50 and 100%
- Irritation: none
- Lymph node proliferation response: no increase of ear thickness > 25% at 25, 50 and 100%
- Toxicity: none

MAIN STUDY
TREATMENT PREPARATION AND ADMINISTRATION:
Exposure during 3 consecutive days at the dorsal site of the ears with test substance or vehicle (25 uL). On day 6 3H-methyl thymidine(20 μCi/mouse) was injected in the tail vein. Five hours thereafter mice were killed and draining auricular lymph nodes were pooled per dose group and assessed for 3HTdR after 18 hours incubation at 4°C using a Beckman LS6500 scintillation system. The EC3 value is calculated based on the results at the different tested concentrations.

EXAMINATIONS
Clinical signs: twice daily on day 1-3, daily on day 3-6
Body weights: prior to administration on day 1, and prior to termination at day 6

ANIMAL ASSIGNMENT AND TREATMENT
- Criteria used to consider a positive response: a threefold or greater increase in 3HTdR incorporation compared to control values (expressed as DPM/min).

Statistics:

NA

Positive control results:

α-Hexylcinnamaldehyde, tech., 85% showed a SI of 5.45 in positive control study at a 25% concentration in acetone/olive oil 4:1.

Parameter:

other: disintegrations per minute (DPM)

Remarks on result:

other: at 25, 50 and 100 % < three fold increase compared to vehicle controls

Concentration (% w/w) in acetone/ olive oil 4:1	dpm (pooled)	dpm/Node	Stimulation Index	Result
Vehicle	12358.39	1544.80	NA	NA
25	15138.14	1892.27	1.22	Negative
50	18755.79	2344.47	1.52	Negative
100	14790.53	1848.82	1.20	Negative

No effects on bodyweight or clinical signs

Interpretation of results:

not sensitising

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

The test substance is considered not sensitizing to the skin

Executive summary:

Exposure of 4 mice/ treatment during 3 consecutive days at the dorsal site of the ears with test substance (25, 50 or 100%) or vehicle. On day 6, 3H-methyl thymidine(20 μCi/mouse) was injected in the tail vein. Five hours thereafter mice were killed and draining auricular lymph nodes were pooled per dose group and assessed for 3HTdR after 18 hours incubation at 4°C using a Beckman LS6500 scintillation system.

The stimulation index was < 3 at all dose levels. The test substance is considered not sensitizing to the skin.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not sensitising)

Additional information:

Migrated from Short description of key information:
Exposure of 4 mice/ treatment during 3 consecutive days at the dorsal site of the ears with test substance (25, 50 or 100%) or vehicle. On day 6, 3H-methyl thymidine(20 μCi/mouse) was injected in the tail vein. Five hours thereafter mice were killed and draining auricular lymph nodes were pooled per dose group and assessed for 3HTdR after 18 hours incubation at 4°C using a Beckman LS6500 scintillation system.
The stimulation index was < 3 at all dose levels. The test substance is considered not sensitizing to the skin.

Justification for selection of skin sensitisation endpoint:
Guideline study under GLP

Respiratory sensitisation

Endpoint conclusion

Endpoint conclusion:

no study available

Justification for classification or non-classification

The available data do not meet the criteria for classification according to Regulation (EC) 1272/2008 or Directive 67/548/EEC, and are therefore conclusive but not sufficient for classification.