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Toxicological information

Acute Toxicity: oral

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Administrative data

acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
09.02.1987 to 03.03.1987
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference Type:
study report
Report date:

Materials and methods

Test guideline
according to guideline
OECD Guideline 401 (Acute Oral Toxicity)
GLP compliance:
Test type:
standard acute method
Limit test:

Test material

Constituent 1
Chemical structure
Reference substance name:
heptan-2-yl [(5-chloroquinolin-8-yl)oxy]acetate
EC Number:
Cas Number:
Molecular formula:
heptan-2-yl [(5-chloroquinolin-8-yl)oxy]acetate
Details on test material:
- Name of test material (as cited in study report): CGA185072 (company code)
- Name of test material (as cited in study report): CGA185072 technical or cloquintocet-mexyl
- Molecular formula (if other than submission substance): not stated
- Substance type:
- Physical state:
- Analytical purity: 91.6%
- Purity test date: not specified
- Lot/batch No.: P. 607001/002
- Expiration date of the lot/batch: not specifed
- Stability under test conditions: not specified
- Storage condition of test material: not specified

Test animals

other: Tif RAIf (SPF), Sprague-Dawley derived
Details on test animals or test system and environmental conditions:
- Source: Ciba-Geigy Ltd, Animal Production, Sisseln, Switzerland
- Age at study initiation: 7 - 8 weeks
- Weight at study initiation: 162-212g
- Fasting period before study: Not specified
- Housing: conventional laboratory cages
- Diet (e.g. ad libitum): Not specified
- Water (e.g. ad libitum): Not specified
- Acclimation period: 5 days

IN-LIFE DATES: From: 09.02.1987 To: 03.03.1987

Administration / exposure

Route of administration:
oral: gavage
CMC (carboxymethyl cellulose)
Details on oral exposure:
The test material was admixed to distilled water containing 0.5% CMC and 0.1% polysorbate 80.
The dosing solution was prepared immediately before administration. The stability was therefore not checked. 10 ml of the solution per kg body weight were applied by gastric intubation. The highest dose group received 20 ml/kg body weight due to the poor solubility of the test material.
2000 or 5000 mg/kg bw
No. of animals per sex per dose:
Five per sex per group
Control animals:
Details on study design:
- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: obsrved hourly for 5 h on day of dosing and twice daily subsequently. Bodyweights recorded pre-test and at weekly intervals
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight
Not applicable - median lethal dose exceeded Guideline limit dose of 2000 mg/kg bw

Results and discussion

Effect levels
Dose descriptor:
Effect level:
> 5 000 mg/kg bw
Based on:
test mat.
None of the rats dosed at 2000 mg/kg bw died. One of four males dosed at 5000 mg/kg bw died and two of five females at the higher dose level.
Clinical signs:
other: Dyspnea, exophthalmus, ruffled fur and curved body positions were observed in all animals. Recovery was evident by day 13.
Gross pathology:
No macroscopic abnormalities noted among rats dosed at 2000 mg/kg bw.
Haemorrhagic lungs and stomachs for one male and two females dosed at 5000 mg/kg bw. Intestinal dilation noted for one female
Other findings:

Applicant's summary and conclusion

Interpretation of results:
not classified
LD50 greater than 5000 mg/kg bw
Executive summary:

The acute toxicity of the substance to rat was investigated under GLP to OECD TG 401. Groups of Tif RAIf (SPF), Sprague-Dawley derived rats were dosed with cloquintocet-mexyl at doses of 2000 or 5000 mg/kg test material in 0.5% aqueous carboxymethyl cellulose and 0.1% polysorbate 80. The animals were assessed daily for the following 14 days for any signs of systemic toxicity and their bodyweights recorded at intervals throughout the study. After 14 days surviving rats were sacrificed and subjected to gross necropsy as were those rats which died spontaneously. Dyspnea, exophthalmus, ruffled fur and curved body positions were observed in all animals. At 5000 mg/kg bw one male and two females died. Surviving animals recovered within 13 days. At necropsy, no macroscopic abnormalities were found at 2000 mg/kg. At 5000 mg/kg one male and 2 females showed hemorrhagic lungs and a hemorrhagic stomach. The small intestine of one female was dilated. The acute oral LD50 of the substance was greater than 5000 mg/kg in male and female rats.