ethyl 2-acetyl-4-methyltridec-2-enoate

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

17 November to 14 December 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

conducted under GLP conditions

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)

Version / remarks:

2001

Deviations:

yes

Remarks:

Deviations from the minimum level of daily mean relative humidity occurred and the first group of 3 animals were deprived of food overnight at the end of Day 1. These deviations did not affect the outcome of the study.

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.1 tris (Acute Oral Toxicity - Acute Toxic Class Method)

Deviations:

yes

Remarks:

Deviations from the minimum level of daily mean relative humidity occurred and the first group of 3 animals were deprived of food overnight at the end of Day 1. These deviations did not affect the outcome of the study.

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.1100 (Acute Oral Toxicity)

Version / remarks:

2002

Deviations:

yes

Remarks:

Deviations from the minimum level of daily mean relative humidity occurred and the first group of 3 animals were deprived of food overnight at the end of Day 1. These deviations did not affect the outcome of the study.

GLP compliance:

yes (incl. QA statement)

Test type:

acute toxic class method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

ethyl 2-acetyl-4-methyltridec-2-enoate

EC Number:

816-455-0

Cas Number:

960253-23-0

Molecular formula:

C18H32O3

IUPAC Name:

ethyl 2-acetyl-4-methyltridec-2-enoate

Test material form:

liquid

Test animals

Species:

rat

Strain:

Wistar

Remarks:

Crl:WI (Han) (outbred, SPF-Quality)

Sex:

female

Details on test animals or test system and environmental conditions:

Species:
Rat, Wistar strain Crl:WI (Han) (outbred, SPF-Quality).
Recognized by international guidelines as the recommended test system (e.g. OECD, EC).
Source: Charles River Deutschland, Sulzfeld, Germany.

Number of animals:
6 Females (nulliparous and non-pregnant). Each dose group consisted of 3 animals.

Age and body weight:
Young adult animals (approx. 11-12 weeks old) were selected.
Body weight variation did not exceed +/- 20% of the sex mean.

Identification:
Earmark and tail mark

Health inspection:
At least prior to dosing. It was ensured that the animals were healthy and without any abnormality that might have affected the study integrity.

Conditions:
Environmental controls for the animal room were set to maintain 18 to 24°C, a relative
humidity of 40 to 70%, at least 10 air changes/hour, and a 12-hour light/12-hour dark cycle.
Any variations to these conditions were maintained in the raw data and had no effect on the
outcome of the study.

Accommodation:
Group housing of 3 animals per cage in labeled Makrolon cages (MIV type; height 18 cm.)
containing sterilized sawdust as bedding material (Lignocel S 8-15, JRS - J.Rettenmaier &
Söhne GmbH + CO. KG, Rosenberg, Germany) and paper as cage-enrichment (Enviro-dri,
Wm. Lillico & Son (Wonham Mill Ltd), Surrey, United Kingdom).
Acclimatization period was at least 5 days before start of treatment under laboratory
conditions.

Diet:
Free access to pelleted rodent diet (SM R/M-Z from SSNIFF® Spezialdiäten GmbH, Soest,
Germany).

Water:
Free access to tap water.
Diet, water, bedding and cage enrichment evaluation for contaminants and/or nutrients was
performed according to facility standard procedures. There were no findings that could
interfere with the study.

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

unchanged (no vehicle)

Details on oral exposure:

Oral gavage, using plastic feeding tubes. The test item was stirred on a magnetic stirrer during dosing.
One single dosage on day 1.
Animals were deprived of food overnight prior to dosing and until 3-4 hours after administration of the test item. Water was available ad libitum.

Doses:

2000 mg/kg (2.17 mL/kg) body weight.
Dose volume calculated as dose level (g/kg) / specific gravity.

No. of animals per sex per dose:

3

Control animals:

no

Details on study design:

The toxicity of the test item was assessed by stepwise treatment of groups of 3 females. The first group was treated at a dose level of 2000 mg/kg. The absence or presence of mortality of animals dosed at one step determined the next step, based on the test procedure defined in the guidelines. The onset, duration and severity of the signs of toxicity were taken into account for determination of the time interval between the dose groups.

Observations:
- Mortality/Viability: Twice daily
- Body weights: Days 1 (pre-administration), 8 and 15.
- Clinical signs: At periodic intervals on the day of dosing (Day 1) and once daily thereafter, until Day 15. The signs were graded according to fixed scales and the time of onset, degree and duration were recorded:
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).
- Necropsy: At the end of the observation period, all animals were sacrificed by oxygen/carbon dioxide procedure and subjected to necropsy. Descriptions of all internal macroscopic abnormalities were recorded.

Statistics:

No statistical analysis was performed (The method used is not intended to allow the calculation of a precise LD50 value).

Results and discussion

Effect levels

Effect levels 1

Sex:

female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Effect levels 2

Key result

Sex:

female

Dose descriptor:

LD50 cut-off

Effect level:

> 5 000 mg/kg bw

Based on:

test mat.

Mortality:

No mortality occurred.

Clinical signs:

other: Hunched posture and piloerection were noted for all animals on Days 1 and/or 2.

Gross pathology:

No abnormalities were found at macroscopic post mortem examination of the animals.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The oral LD50 value of GR-86-6599 in Wistar rats was established to exceed 2000 mg/kg body weight.
According to the OECD 423 test guideline, the LD50 cut-off value was considered to exceed 5000 mg/kg body weight.
Based on these results, GR-86-6599 does not have to be classified and has no obligatory labelling requirement for acute oral toxicity according to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) of the United Nations (2015) (including all amendments) and Regulation (EC) No 1272/2008 on classification, labelling and packaging of items and mixtures (including all amendments).

Executive summary:

Assessment of acute oral toxicity with GR-86-6599 in the rat (Acute Toxic Class Method).

The study was carried out based on the guidelines described in:

- OECD No.423 (2001) "Acute Oral Toxicity, Acute Toxic Class Method"

- Commission Regulation (EC) No 440/2008, B1 tris: "Acute Oral Toxicity, Acute Toxic Class Method"

- EPA, OPPTS 870.1100 (2002), "Acute Oral Toxicity" JMAFF Guidelines (2000), including the most recent revisions.

GR-86-6599 was administered by oral gavage to two consecutive groups of three female Wistar rats at 2000 mg/kg body weight. Animals were subjected to daily observations and weekly determination of body weight. Macroscopic examination was performed after terminal sacrifice (Day 15).

No mortality occurred.

Hunched posture and piloerection were noted for all animals on Days 1 and/or 2.

The mean body weight gain shown by the animals over the study period was considered to be normal.

No abnormalities were found at macroscopic post mortem examination of the animals.

The oral LD50 value of GR-86-6599 in Wistar rats was established to exceed 2000 mg/kg body weight.

According to the OECD 423 test guideline, the LD50 cut-off value was considered to exceed 5000 mg/kg body weight.