1,1'-(1,1,3-trimethylpropane-1,3-diyl)bis(cyclohexane)

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Dosing was initiated on 15 May 2018. The in-life phase of the study was completed on 31 May 2018.

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

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

Test guideline 2

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

2008

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.1100 (Acute Oral Toxicity)

Version / remarks:

2002

Test guideline 4

Qualifier:

according to guideline

Guideline:

other: JMAFF Guidelines

Version / remarks:

2000, including the most recent revisions

GLP compliance:

yes

Test type:

acute toxic class method

Limit test:

yes

Test material

Test material information

1

Reference substance name:

1,1'-(1,1,3-trimethylpropane-1,3-diyl)bis(cyclohexane)

EC Number:

254-227-7

EC Name:

1,1'-(1,1,3-trimethylpropane-1,3-diyl)bis(cyclohexane)

Cas Number:

38970-72-8

Molecular formula:

C18H34

IUPAC Name:

(4-cyclohexyl-4-methylpentan-2-yl)cyclohexane

Specific details on test material used for the study:

Purity: 97.2%
Batch: 170918339

Test animals

Species:

rat

Strain:

Wistar

Remarks:

Crl: WI(Han)

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River Deutschland, Sulzfeld, Germany
- Females nulliparous and non-pregnant: Yes
- Age at study initiation: Young adult animals (approximately 9 weeks old)
- Weight at study initiation: 158 to 174 g
- Housing: Polycarbonate cages (height 18 cm.) containing sterilized sawdust as bedding material equipped with water bottles.
- Fasting: overnight (maximum of 20 hours) prior to treatment
- Diet: ad libitum
- Water: ad libitum
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 18 to 24°C
- Humidity (%):40 to 70% ; Deviations from the maximum level of daily mean target humidity occurred on several days during the study (highest value was 75%).
This study plan deviation is considered not to have affected the integrity of the study because it did not noticeably affect the clinical condition of the animals or the outcome of the study
- Air changes (per hr): > 10 changes per hour
- Photoperiod (hrs dark / hrs light): 12 hour light/12 hour dark cycle

IN-LIFE DATES: From: 15 May 2018 To: 31 May 2018

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

unchanged (no vehicle)

Details on oral exposure:

CLASS METHOD
- Rationale for the selection of the starting dose: The dose levels were based on the OECD test guidelines and were selected from the series 5 (lowest dose level), 50, 300 and 2000 (highest dose level) mg/kg body weight. The starting dose level should be the one that is likely to produce mortality in at least some of the animals and was selected based on available toxicity data of the test item.

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

6

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: observed 3 times on day of dosing and daily thereafter; weighed day 1 (predose), 8 and 15
- Necropsy of survivors performed: yes

Statistics:

No statistical analysis was performed.

Results and discussion

Effect levels

Effect levels 1

Key result

Sex:

female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Remarks on result:

not determinable due to absence of adverse toxic effects

Effect levels 2

Key result

Sex:

female

Dose descriptor:

LD50

Effect level:

> 5 000 mg/kg bw

Based on:

test mat.

Remarks on result:

not determinable due to absence of adverse toxic effects

Remarks:

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

Mortality:

No mortality occurred

Clinical signs:

Hunched posture was noted for the animals between Days 1 and 3

Body weight:

The body weight gain shown by the animals over the study period was considered to be similar to that expected for normal untreated animals of the same age and strain

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 1,1’-(1,1,3-trimethylpropane-1,3-diyl)bis(cyclohexane) 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.

Executive summary:

The oral LD50 value of 1,1’-(1,1,3-trimethylpropane-1,3-diyl)bis(cyclohexane) 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.