1-(5-ethyl-5-methylcyclohex-1-en-1-yl)pent-4-en-1-one

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

18-11-2014 to 25-02-2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Guideline study performed under GLP. All relevant validity criteria were met.

Justification for type of information:

Information as to the availability of the in vivo study is provided in 'attached justification'.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2015

Report date:

2015

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

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

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

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

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.1100 (Acute Oral Toxicity)

Deviations:

no

Test guideline 4

Qualifier:

according to guideline

Guideline:

other: Japanese Ministry of Agriculture, Forestry and Fisheries, Test Data for Registration of Agricultural Chemicals, Acute oral toxicity (2-1-1), 12 Nousan No 8147, Agricultural Production Bureau, November 24, 2000

GLP compliance:

yes (incl. QA statement)

Remarks:

inspected: July 2014; signature: September 2014

Test type:

acute toxic class method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

1-(5-ethyl-5-methylcyclohex-1-en-1-yl)pent-4-en-1-one

EC Number:

807-612-4

Cas Number:

1393645-32-3

Molecular formula:

C14H22O

IUPAC Name:

1-(5-ethyl-5-methylcyclohex-1-en-1-yl)pent-4-en-1-one

Test material form:

liquid

Details on test material:

- Physical state: Liquid
- Storage condition of test material: Refrigerated in the dark under nitrogen
- Other: colourless

Test animals

Species:

rat

Strain:

Wistar

Remarks:

RccHan: WIST

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Recognised supplier
- Females (if applicable) nulliparous and non-pregnant: Yes.
- Age at study initiation: 8 - 9 weeks.
- Weight at study initiation: 161 - 182 g
- Fasting period before study: Overnight before dosing and approximately four hours after dosing.
- Housing: Group housed in groups of up to three same sex in suspended solid-floor polycarbonate cages furnished with softwood flakes and aspen chew block as cage enrichment..
- Diet (e.g. ad libitum): Certified diet from recognised supplier, provided ad libitum (except for fasting period).
- Water (e.g. ad libitum): ad libitum (except for fasting period)
- Acclimation period: At least 5 days.

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19 - 23
- Humidity (%): 40 - 70%
- Air changes (per hr): Not reported. Positive pressure, filtered air environment.
- Photoperiod: 12 h light / 12 h dark

IN-LIFE DATES: From: To: 2014-11-20 to 2014-12-16

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

corn oil

Details on oral exposure:

VEHICLE
- Concentration in vehicle: The test item was formulated at concentrations of 30 or 200 mg/mL in the vehicle and administered at a volume of 10 mL/kg body weight. Formulations were prepared on the day of dosing.
- Amount of vehicle (if gavage): The concentration of the test item in vehicle was varied to allow constant dosage volume in terms of mL/kg body weight.
- Justification for choice of vehicle: The vehicle was selected based on trial formulations performed.
- Lot/batch no. (if required): See full study report.
- Purity: See full study report.

MAXIMUM DOSE VOLUME APPLIED: 10 mL/kg bw.

DOSAGE PREPARATION (if unusual): Not applicable. The test item was prepared in the vehicle. It was administered to the animals under a volume of 10 mL/kg. The volume administer was adjusted according to bodyweight on day of treatment.

CLASS METHOD (if applicable)
- Rationale for the selection of the starting dose: 300 mg/kg bw based on guideline recommendations. In the absence of data regarding the toxicity of the test item, 300 mg/kg was chosen as the starting dose.

Doses:

300 mg/kg bw in corn oil vehicle (starting dose); 2000 mg/kg bw

No. of animals per sex per dose:

3 initial females (sighting study) and further 3 females (main study); total of up to 6 per dose according to sequential guideline testing strategy.

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Clinical observations were made 0.5, 1, 2, and 4 hours after dosing and then daily for fourteen days. Morbidity and mortality checks were made twice daily. Individual body weights were recorded on Day 1 (the day of dosing) and on Days 8 and 15.
- Necropsy of survivors performed: yes

Results and discussion

Effect levels

Sex:

female

Dose descriptor:

LD50

Effect level:

> 300 mg/kg bw

Based on:

test mat.

Mortality:

300 mg/kg bw: No mortality
2000 mg/kg bw: Two females mortalites (humane termination).

Clinical signs:

other: 300 mg/kg bw: No signs of systemic toxicity were noted. 2000 mg/kg bw: Surviving female signs comprised of piloerection and hunched posture on day 3. Recovery complete by day 11. In the non-survivors, clinical signs prior to humane termination comprised o

Gross pathology:

300 mg/kg bw: No abnormalities were noted at necropsy.
2000 mg/kg bw: No abnormalities were noted at necropsy amongst survivors. In the non-survivors, post humane termination: congestion (characterised by darkened tissues) of the lungs, pallor of the kidneys liver and spleen was observed.

Other findings:

- Organ weights: Not reported.
- Histopathology: Not reported. No macropathological abnormalities amongst survivors.
- Potential target organs: Not applicable.
- Other observations: Not applicable.

Applicant's summary and conclusion

Interpretation of results:

Category 4 based on GHS criteria

Remarks:

Criteria used for interpretation of results: EU

Conclusions:

Under the conditions of this study the oral LD50 was established to be > 300 and < 2000 mg/kg bw in female Wistar rats.

Executive summary:

The study was performed according to OECD TG 423, EU Method B.1 tris, US EPA OPPTS 870.1100 and Japan Acute Oral Toxicity (2-1-1) (2000) guidelines in accordance with GLP to assess the acute oral toxicity of the test item by the acute toxic class method following a single oral administration in the female Wistar RccHan: WIST strain rat. The test item was administered by oral gavage in corn oil vehicle at a dose volume of approximately 10 mL/kg in an initial step at 300 mg/kg in three females. In the absence of significant toxicity, at this dose level the test item was then administered again in a further three females. In the absence of toxicity the test item was finally administered at 2000 mg/kg bw in corn oil by oral gavage to a group of three females. At 300 mg/kg bw there was no mortality, no significant clinical signs and bodyweight gains were as expected. There was no abnormalities at necropsy. At 2000 mg/kg bw, two of three females were humanely terminated at day 2 due to poor clinical condition. Clinical signs prior to death comprised of unsteady gait, decreased activity, unresponsive behaviour, cold to touch, piloerection, hunched posture and reduced body tone, flattened posture, unresponsive behaviour, flattened posture, lachrymation (both eyes), splayed hindlimbs, shallow breathing and partially closed eye lids (both eyes). Signs were seen from Day 2 for both females. A loss in body weight was noted for both of the decedents. Macroscopic examination of the animals revealed congestion (characterised by darkened tissues) of the lungs, pallor of the kidneys liver and spleen. The survivor at 2000 mg/kg bw comprised clinical signs of piloerection and hunched posture. These signs were first noted on Day 3. Recovery of the surviving animal, as judged by external appearance and behaviour, was complete by Day 11. Survivors had expected bodyweight gain and there were no abnormalities at necropsy. Under the conditions of this study the oral LD50 was established to be > 300 and < 2000 mg/kg bw in the female Wistar rat.