4-tert-butylbenzoic acid

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: data contained in EU risk assessment report of the substance - credibility is assumed. Reference to origin (Shell Development Company)

Data source

Reference

Reference 1

Reference Type:

other: EU risk assessment report

Title:

No information

Author:

Federal Institute for Occupational Safety and Health, Division for Chemicals and Biocides Regulation, Germany

Year:

2009

Bibliographic source:

European Union Risk Assessment Report, 4-tert-butylbenzoic acid, CAS No: 98-73-7, EINECS No: 202-696-3, p. 50, Final Approved Version, July 2009

Reference 2

Reference Type:

study report

Title:

Unnamed

Year:

1950

Materials and methods

Principles of method if other than guideline:

Determination of oral LD 50 of the test substance by intragastical administration of different concentrations in an aqueous suspension of gum acacia.

GLP compliance:

not specified

Test material

Test material information

Constituent 1

Reference substance name:

4-tert-butylbenzoic acid

EC Number:

202-696-3

EC Name:

4-tert-butylbenzoic acid

Cas Number:

98-73-7

Molecular formula:

C11H14O2

IUPAC Name:

4-tert-butylbenzoic acid

Details on test material:

- Name of test material (as cited in study report) and analytical purity:
4-tert-butylbenzoic acid, containing 5 % of the m-compound (3-tert-butylbenzoic acid, Shell production grade)

Test animals

Species:

mouse

Strain:

other: Swiss inbred

Sex:

not specified

Details on test animals or test system and environmental conditions:

white mice

Administration / exposure

Route of administration:

other: intragastic

Vehicle:

other: gum acacia in water

Details on oral exposure:

administration of an aqueous suspension of the test substance in gum acacia

Doses:

350, 400, 550, 600, 650, 700, and 800 mg/kg bw

No. of animals per sex per dose:

10

Results and discussion

Effect levels

Dose descriptor:

LD50

Effect level:

568 mg/kg bw

Any other information on results incl. tables

Doses of 350, 400, 550, 600, 650, 700, and 800 mg/kg bw were given to 10 mice each resulting in the following mortalities: after administration of 350 mg/kg 1/10 mice died on day 2; after administration of 400 mg/kg 4/10, after 550, 600, and 650 mg/kg 5/10 each, after 700 mg/kg 7/10, and after 800 mg/kg all mice died within 24 hours. The mice were mildly depressed within 1/3 hours after dosing. Within an hour, signs of muscular distress, marked incoordination and the Straub tail effect (spinal cord excitant) were present. At 5 hours a paralysis of the forelegs was evident in two thirds of the mice. In 3 of these, response of the tail and paws to painful stimuli was depressed or absent, but recovery occasionally followed even this deep depression. The pathologic changes noted in the 22 mice autopsied included signs off lung irritation, hemorrhage of the lungs, increased pigmentation of the liver, denuding of the epithelium of the intestines, and hyperemia of the intestines.