4'-hydroxyacetophenone

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: well-documented GLP study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1992

Report date:

1992

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

EPA OTS 798.1175 (Acute Oral Toxicity)

GLP compliance:

yes (incl. QA statement)

Remarks:

testing lab.

Test type:

acute toxic class method

Limit test:

no

Test material

Test material information

Constituent 1

Reference substance name:

4'-hydroxyacetophenone

EC Number:

202-802-8

EC Name:

4'-hydroxyacetophenone

Cas Number:

99-93-4

Molecular formula:

C8H8O2

IUPAC Name:

1-(4-hydroxyphenyl)ethan-1-one

Details on test material:

Name of the test substance used in the study report: C-01650 (4-HAP)
purity: 99.97%

Test animals

Species:

rat

Strain:

Sprague-Dawley

Sex:

male/female

Details on test animals or test system and environmental conditions:

Body weight range approximately 190-350 g at pre-fast. Animal weights fell within 20% of the group mean.
Acclimation period: 7 days
Animal identification: Each animal was assigned a unique and individual number. This number was permanently indicated on the animal with an ear tag.
Animals were housed separately from any other species and individually housed in stainless steel, wire mesh bottom cages.
Temperature: 64 - 79°F; humidity 30 - 70%; light: 12/12 light/dark cycle.
Fresh certified rodent feed was provided ad libitum, except feed was withheld the night prior to dosing; fresh potable water was provided ad libitum.

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

corn oil

Details on oral exposure:

The test substance homogeneized in corn oil was administered orally to five male and five female animals at each of the following dose levelst 1.0, 2.0, and 5.0 g/kg. The 5.0 g/kg dose level was administered initially and based upon the mortality noted in this dose group, the remaining dose levels were administered subsequently in order of decreasing concentration. A vehicle control group consisting of five male and five female rate were dosed with corn oil. The control animals were dosed concurrently with the 5.0 g/kg animals. Individual dosing volumes were adjusted to 1 ml/100 g body weight, based upon the animal's fasted body weight.
The animals were randomly selected by a computer randomization programn based on their prefasted body weights. The animals were fasted the night immediately prior to dosing.

Doses:

1000, 2000, 5000 mg/kg

No. of animals per sex per dose:

5

Control animals:

yes

Details on study design:

Observations were made hourly for the first 4 hours immediately after dosing and twice daily (a.m. and p.m.) for the next 13 days for a total of 14 days of observation.

Results and discussion

Effect levels

Sex:

male/female

Dose descriptor:

LD50

Effect level:

2 240 mg/kg bw

Mortality:

Control: 0; 1000 mg/kg: 0; 2000 mg/kg: 3/5 males and 3/5 females; 5000 mg/kg: 4/5 males and 5/5 females
All animals died within 24 hours.

Clinical signs:

other: 8 of the 5000 mg/kg dose group animals, 10 of the 2000 mg/kg dose group animals and 8 of the 1000 mg/kg dose group animals exhibited one or more of the following observations during their respective 14 day observation periods: oral discharge, nasal discha

Gross pathology:

All animals that survived the study period were euthanized by CO2. All animals at the conclusion of the study and those that died on study were subjected to a post-mortem examination. Gross necropsy observations included fluid in one or more of the following organs: stomach, duodenum, jejunum and/or ileum as well as external observations. One animal from the 2000 mg/kg dose group was missing the left testicle. The missing testicle is considered to be a genetic anomaly.