Fatty acids, C18 unsaturated, C12-14 (even numbered) alkyl esters

Acute Toxicity: dermal

Administrative data

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

weight of evidence

Study period:

19 May - 2 Jun 2010

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Report date:

2010

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

Deviations:

yes

Remarks:

the test substance was applied with an occlusive dressing

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.3 (Acute Toxicity (Dermal))

Deviations:

yes

Remarks:

the test substance was applied with an occlusive dressing

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.1200 (Acute Dermal Toxicity)

Deviations:

yes

Remarks:

the test substance was applied with an occlusive dressing

Test guideline 4

Qualifier:

according to guideline

Guideline:

other: Japanese Ministry of Agriculture, Forestry and Fisheries (JMAFF), 12 Nousan, Notification No. 8147, November 2000; including the most recent partial revisions

Deviations:

yes

Remarks:

the test substance was applied with an occlusive dressing

GLP compliance:

yes

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Decyl oleate

EC Number:

222-981-6

EC Name:

Decyl oleate

Cas Number:

3687-46-5

Molecular formula:

C28H54O2

IUPAC Name:

decyl octadec-9-enoate

Details on test material:

- Name of test material (as cited in study report): only trade name given
- Substance type: clear, colourless liquid
- Physical state: liquid
- Analytical purity: 100%
- Lot/batch No.: CB 00390004
- Expiration date of the lot/batch: 31 Mar 2011
- Storage condition of test material: at room temperature in the dark
- Density: 0.87 g/mL

Test animals

Species:

rat

Strain:

Wistar

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River Deutschland, Sulzfeld, Germany
- Age at study initiation: approximately 10 weeks
- Weight at study initiation: 269-284 g (males), 181-194 g (females)
- Housing: animals were housed individually in labelled Makrolon cages (MIII type, height 18 cm) containing sterilised sawdust as bedding material (Litalabo, S.P.P.S., Argenteuil, France) and paper as cage-enrichment (Enviro-dri, Wm. Lillico & Son (Wonham Mill Ltd.), Surrey, UK). During the acclimation period the animals were housed in groups in Macrolon cages (MIV type).
- Diet: pelleted rodent diet (SM R/M-Z from SSNIFF Spezialdiäten GmbH, Soest, Germany), ad libitum
- Water: tap water, ad libitum
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19.6-21.2
- Humidity (%): 39-62
- Air changes (per hr): 15
- Photoperiod (hrs dark / hrs light): 12/12

Administration / exposure

Type of coverage:

occlusive

Vehicle:

unchanged (no vehicle)

Details on dermal exposure:

TEST SITE
- Area of exposure: the back of the animals; approximately 25 cm² for males and 18 cm² for females
- % coverage: 10
- Type of wrap if used: the test substance was held in contact with the skin with a dressing, consisting of a surgical gauze patch (Surgy 1D) covered with aluminium foil and Coben elastic bandage, respectively. A piece of Micropore tape was used to fix the bandage in females only.

REMOVAL OF TEST SUBSTANCE
- Washing (if done): the skin was cleaned using tap water
- Time after start of exposure: 24 h

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 2000 mg/kg bw
- Constant volume or concentration used: yes, the dose volume was calculated as dose level (g/kg) / density (g/mL)

Duration of exposure:

24 h

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

5

Control animals:

other: an untreated, adjacent skin area served as the control

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: the animals were observed twice daily for mortality; the body weight was recorded on Day 1 (prior to dosing), 8 and 15.
- Necropsy of survivors performed: yes, on Day 15 the animals were subjected to necropsy and all gross macroscopical abnormalities were recorded
- Other examinations performed: clinical signs were observed at periodic intervals on the day of dosing (day 1) and once daily thereafter, until sacrifice. The time of onset, degree and duration were recorded and the symptoms graded:
Maximum grade 4: grading slight (1) to very severe (4)
Maximum grade 3: grading slight (1) to severe (3)
Maximum grade 1: presence is scored (1)

Results and discussion

Effect levels

Key result

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

There was no mortality during the study period (see Table 1).

Clinical signs:

other: Piloerection was observed from 4 h - day 2 after dosing in 2/5 males (see Table 2). Chromodacryorrhoea (excessive secretion of a reddish-brown liquid from the eyes) (grade 1) was observed in 3/5 males 2-4 hours after dosing. No systemic clinical signs of

Gross pathology:

The necropsy and histopathological examination did not reveal substance-related findings.

Other findings:

- Other observations: On the treated skin area, erythema was observed for up to 4 days during Day 3-7 in 3/5 females. Scales or scabs (grade 1) were noted on the treated skin area in 5/5 females and 3/5 males for up to 9 days during Day 7-15 of the observation period.

Any other information on results incl. tables

Table 1: Mortality and clinical signs

Dose [mg/kg bw]	Toxicological results*	Duration of clinical signs	Time of death	Mortality (%)
Males
2000	0/3/5	4 h – day 2	Day 1-3	0
Females
2000	0/0/5	-	Day 1	0
LD50 > 2000 mg/kg bw

* first number = number of dead animals                                 

second number = number of animals with systemic clinical signs         

  third number = number of animals used                 Table 2: Clinical signs, systemic/local

Effect*	Max grade	Male No./duration (hours or day after dosing)					Female No./duration (hours or day after dosing)
		1	2	3	4	5	6	7	8	9	10
Systemic
Piloerection	1	4 h - 2 d				4 h - 2 d
Chromoda-cryorrhoea	3		2 - 4 h	2 - 4 h	4 h
Local
Erythema, focal	4						7 d		7 d	3 – 7 d	7 d
Scales	3			8 – 10 d	7 – 15 d		7 – 8 d, 14 d	8 – 11 d	7 – 9 d	7 – 8 d	7 – 9 d
Scabs	3		7 - 11 d		9 - 15 d		8 – 13 d

* all grade 1

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The LD50 (dermal) of the substance is greater than 2000 mg/kg bw.

Executive summary:

The acute dermal toxicity of decyl octadec-9 -enoate (CAS No 3687 -46 -5) was assessed in a study according to OECD Guideline 402 with rats. As a result of the study, the LD50 (dermal) was determined to be > 2000 mg/kg bw.