2-(5-halo-2-hydroxy-aryl)-3H-heteropolycycle-4-one

Endpoint summary

Description of key information

Acute oral toxicity: LD50 > 2000 mg/kg bw (OECD 423; GLP; rats)

Key value for chemical safety assessment

Acute toxicity: via oral route

Link to relevant study records

Reference

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2000-03-15 to 2000-04-17

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

1996-03-22

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed March 1999

Test type:

acute toxic class method

Limit test:

yes

Specific details on test material used for the study:

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: in the original container, at room temperature (range of 20 ± 3 °C), away from direct sunlight

Species:

rat

Strain:

other: HanIbm: WIST (SPF)

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: RCC ltd, Biotechnology & Animal Breeding Division, Wölferstrasse 4, CH-4414 Füllinsdorf / Switzerland
- Age: males: 8 - 10 weeks; females: 8 - 10 weeks
- Weight: males: 196.1 - 209.7 g; females: 164.9 - 171.9 g
- Fasting period before study: 18 (females) to 20 (males) hours, but with free access to water; food was provided again 2 (males) to 3 (females) hours after dosing
- Housing: groups of three in Makrolon type-4 cages with standard softwood bedding ("Lignocel", Schill AG, CH-4132 Muttenz)
- Diet (ad libitum, except for the overnight fasting period prior to intubation): pelleted standard Kilba 3433, batch no. 43/99 rat maintenance diet (Provimi Kliba AG, CH-4303 Kaiseraugst)
- Water (ad libitum): community tap water
- Acclimation period: one week

ENVIRONMENTAL CONDITIONS
- Temperature: 22 - 24 °C
- Relative humidity: 31 - 56 %
- Air changes: 10 - 15 air changes/hour
- Photoperiod (hrs dark / hrs light): 12/12

Route of administration:

oral: gavage

Vehicle:

polyethylene glycol

Remarks:

(PEG 300)

Details on oral exposure:

DOSAGE PREPARATION:
The test article was placed into a glass beaker on a tared Mettler PM 460 balance and the vehicle (polyethylene glycol, PEG 300) was added. A weight by volume dilution was prepared using a magnetic stirrer and an ultrasonic water bath as homogenizers. Homogeneity of the test article in the vehicle was maintained during the treatment.
The preparation was made shortly before each dosing.

MAXIMUM DOSE VOLUME APPLIED: 10 mL

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

3 males / 3 females

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing:
mortality: one, two, trhee and five hours after test article administration on test day 1 and twice daily during days 2 - 15.
body weights: on test days 1 (pre-administration), 8 and 15
Clinical signs: each animal was examined for changes in appearance and behaviour four times during day 1, and once daily for suriving animals during days 2 -15. All abnormalities were recorded.
- Necropsy of survivors performed: yes, at the end of the observation period all animals were sacrificed and examined macroscopically. All abnormalities were recorded.

Statistics:

No statistical analysis was used.

Key result

Sex:

male/female

Dose descriptor:

LD50

Effect level:

2 000 mg/kg bw

Based on:

test mat.

Mortality:

No deaths occurred during the study.

Clinical signs:

Slight dyspnea was observed in one male animal treated with 2000 mg/kg bw from 3 to 5 hours after the administration. No clinical signs were observed during the observation period in all other animals.

Body weight:

One female animal showed a slight loss of body weight (1.7 %) between test day 8 and 15. The body weight of the other animals was within the range commonly recorded for animals of this strain and age.

Gross pathology:

No macroscopic findings were observed at necropsy.

Interpretation of results:

GHS criteria not met

Conclusions:

LD50 (rats) > 2000 mg/kg bw
According to the Regulation (EC) No 1272/2008 and subsequent adaptations, the substance is not acutely toxic via the oral route.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Acute toxicity: via inhalation route

Endpoint conclusion

Endpoint conclusion:

no study available

Acute toxicity: via dermal route

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

Acute oral toxicity

One reliable study described by Arcelin (2000; OECD 423 (1996; GLP) is considered to be reliable without restrictions and is used as key study for this endpoint. The LD50 was determined to be greater than 2000 mg/kg bw.

Justification for classification or non-classification

Acute oral toxicity

The substance is not acutely toxic via the oral route based on an acute oral toxicity test (OECD 423) and does not require classification according to Regulation (EC) No 1272/2008 and subsequent adaptations.

Specific target organ toxicant (STOT) - single exposure: oral

Reversible or irreversible adverse health effects were not observed immediately or after exposure in an acute oral toxicity test (OECD 423). Thus, the classification criteria as specific target organ toxicant (STOT) – single exposure, oral are not met and the substance does not require classification according to Regulation (EC) No 1272/2008 and subsequent adaptations.