4-[4-(3,4-Difluorophenyl)-cyclohexyl]-cyclohexanone

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

November 11, 2002 - January 27, 2003

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2003

Report date:

2003

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:

adopted on December 17th, 2001

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.1 (Acute Toxicity (Oral))

Version / remarks:

Commission Directive of 30th. July 1996 adapting to technical progress for the 22nd time Council Directive 67/548/EEC on the approximation of the laws, regulations and administrative provisions relating to the classification, packaging and labeling of dangerous substances
(Official Journal of the European communities No. L 248, September 30, 1996)

Deviations:

no

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:

4'-(3,4-difluorophenyl)-[1,1'-bi(cyclohexane)]-4-one

EC Number:

605-495-2

Cas Number:

167948-98-3

Molecular formula:

C18H22F2O

IUPAC Name:

4'-(3,4-difluorophenyl)-[1,1'-bi(cyclohexane)]-4-one

Test animals

Species:

rat

Strain:

Wistar

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: F. Winkelmann, Borchen, Germany
- Females nulliparous and non-pregnant: yes
- Age at study initiation: approx. 6 to 8 weeks
- Weight at study initiation :187 g (range from 160 to 202 g)
- Fasting period before study: 17 hours before until up to 4 hours after treatment
- Housing: separately in type III Makrolon cages
- Diet: ad libitum
- Water: ad libitum
- Acclimation period: at least 7 days

ENVIRONMENTAL CONDITIONS
- Temperature: 22°C
- Humidity: 41 - 76%
- Photoperiod (hrs dark / hrs light): 12 hour light - 12 hour dark regime

IN-LIFE DATES: From: day 1 To: day 15

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

methylcellulose

Details on oral exposure:

VEHICLE
- Concentration in vehicle: 200 g/L
- Amount of vehicle: 10 ml/kg
- Justification for choice of vehicle: well tolerated and established standard vehicle

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

3

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations: daily
- Frequency of weighing: day 1, 2, 4, 6, 8, 11, 13 and 15
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight, gross pathology

Statistics:

The body weight data were recorded with the PC-program "AKUDAT". The statistical evaluations of the body weight were carried out with the PC-program "TOX 511 A". The body weight development of each rat and group was determined. The group mean value was calculated for each measurement and printed on tables.

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:

All rats survived the observation period.

Clinical signs:

No signs of toxicity were detected in the 3 male and 3 female rats after treatment with 2000 mg/kg bw.

Body weight:

Body weight development of the treated rats was inconspicuous.

Gross pathology:

The gross pathological examination revealed no organ alterations.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

Based on the result of this study, it is concluded that the LD50 value of the substance is higher than 2000 mg/kg bw after oral treatment in rats.

Executive summary:

The test item was tested for acute toxicity in rats after oral administration of 2000 mg/kg body weight. Directly before administration the test material was prepared with aqueous methylcellulose solution as the vehicle. This study was performed according to the "Acute toxic class method" (ATC) and fully compliant with OECD TG 423 (2001). No signs of toxicity were detected in the rats (3 males and 3 females) after treatment with 2000 mg/kg bw. There were no deaths during the course of the study. The gross pathological examination revealed no organ alterations. Based on the results of this study, it is considered that the test item has no acute toxic potential and that the LD50 value is higher than 2000 mg/kg bw after oral treatment in rats.