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Toxicological information

Acute Toxicity: oral

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Administrative data

Endpoint:
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1992
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study performed under GLP. All relevant validity criteria were met.
Cross-reference
Reason / purpose for cross-reference:
read-across: supporting information

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1992
Report date:
1992

Materials and methods

Test guidelineopen allclose all
Qualifier:
equivalent or similar to guideline
Guideline:
EU Method B.1 (Acute Toxicity (Oral))
Deviations:
no
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 401 (Acute Oral Toxicity)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
inspected: June 1990 ; signature: September 1990
Test type:
standard acute method
Limit test:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
Tetrahydro-4-methyl-2-phenyl-2H-pyran
EC Number:
303-662-1
EC Name:
Tetrahydro-4-methyl-2-phenyl-2H-pyran
Cas Number:
94201-73-7
Molecular formula:
C12H16O
IUPAC Name:
4-methyl-2-phenyltetrahydro-2H-pyran
Test material form:
liquid
Details on test material:
- Physical state: liquid
- Storage condition of test material: stored in the dark at about 4°C
- Other: yellow

Test animals

Species:
rat
Strain:
other: Crl:CD(SD)BR strain (VAF plus)
Sex:
male/female
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Source: Recognised animal supplier
- Age at study initiation: 4-6 weeks
- Weight at study initiation: males 100-113g; females 109 - 116g
- Fasting period before study: overnight before dosing
- Housing: Animals were housed in groups of 5, by sex, in grid bottomed cages suspended over cardboard lined excreta trays. cardboard tray liners were changed as often as necessary to maintain hygiene.
- Diet (e.g. ad libitum): pelleted diet ad libitum
- Water (e.g. ad libitum): Tap water ad libitum
- Acclimation period: 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 18-21
- Humidity (%): 32-52
- Air changes (per hr): not reported
- Photoperiod (hrs dark / hrs light): 12 hour dark / 12 hours light

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
corn oil
Details on oral exposure:
VEHICLE
- Amount of vehicle (if gavage): 10 mL/kg
Doses:
2000 mg/kg
No. of animals per sex per dose:
5 per sex dose
Control animals:
no
Details on study design:
- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: All animals were examined shortly after dosing and approximately 30 minutes, 1, 2 and 4 hours after dosing and daily thereafter for 14 consecutive days. On the day of dosing all animals were weighed in order to calculate the amount of test article to be administered. They were weighed again on day 8 and on day 15.
- Necropsy of survivors performed: yes

Results and discussion

Effect levels
Sex:
male/female
Dose descriptor:
LD50
Effect level:
> 2 000 mg/kg bw
Based on:
test mat.
Mortality:
One female was euthanasied on day 2 as death was considered to be inevitable. The remaining animals survived to the end of the study.
Clinical signs:
other: A hunched posture was seen in all females and most males from day 1, but by day 3 all surviving animals appeared to be outwardly healthy.
Gross pathology:
No significant findings that are not consistent with background macroscopic pathology of the strain.

Applicant's summary and conclusion

Interpretation of results:
not classified
Remarks:
Criteria used for interpretation of results: EU
Conclusions:
The acute oral median lethal dose (LD50) of the test substance in male and female Crl:CD(SD)BR strain (VAF plus) of rat was estimated to be greater than 2000 mg/kg body weight.
Executive summary:

The study was performed according to a method equivalent to EU Method B.1 and/or OECD TG 401 guidelines in accordance with GLP. The test material was administered as a single oral dose, by gavage, at a dose level of 2000 mg/kg bodyweight to a group of 5 male and 5 female rats following an overnight fast. The animals were observed for 14 days and survivors were then euthanized. All animals were subject to necropsy. One female was humanely euthanized as death was considered to be inevitable; all remaining animals survived to the end of the study. Clinical signs of toxicity were noted in most animals on the day of dosing, but all surviving animals appeared outwardly healthy from day 3 onwards. There was no adverse effect on bodyweight gain in animals of either sex. Necropsy findings were of low incidence and are considered not to be significant. When administered as a single oral dose of 2000 mg/ kg bodyweight, the test material produced some evidence of toxicity in the rat. The LD50 for both sexes combined is estimated to be in excess of 2000 mg/kg.