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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Toxicological information

Repeated dose toxicity: oral

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Administrative data

Endpoint:
sub-chronic toxicity: oral
Type of information:
migrated information: read-across based on grouping of substances (category approach)
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: comparable to a guideline study

Data source

Referenceopen allclose all

Reference Type:
study report
Title:
Unnamed
Year:
1988
Report date:
1988
Reference Type:
publication
Title:
Comparative toxicity of cresol isomers
Author:
Dietz DD, Levine BS, Sonawane RB, Rubenstein R, DeRosa C
Year:
1987
Bibliographic source:
the Toxicologists 7, 246 No.982

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: Sontag JM, Page NP, Saffotti U, NCI, DHEW Publication No (NIH)78-ß01Guidelines for Carcinogen Bioassay in small rodents
Principles of method if other than guideline:
Method: see section" any other information of materials and methods"
GLP compliance:
yes
Limit test:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
o-cresol
EC Number:
202-423-8
EC Name:
o-cresol
Cas Number:
95-48-7
Molecular formula:
C7H8O
IUPAC Name:
o-cresol
Details on test material:
IUCLID4 Test substance: other TS: o-cresol purity 99.5%

Test animals

Species:
rat
Strain:
Sprague-Dawley
Sex:
male/female
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Source: Charles River Breeding Laboratories
- Age at study initiation: 5-6 weeks
- Fasting period before study: 24 hours
- Housing: individually
- Diet : ad libitum):
- Water : ad libitum):
- Acclimation period: 16 days


ENVIRONMENTAL CONDITIONS
- Temperature (°F): 72
- Humidity (%): 50
- Air changes (per hr): 12-15
- Photoperiod (hrs dark / hrs light): 12/12

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
corn oil
Details on oral exposure:
PREPARATION OF DOSING SOLUTIONS:
test solution was produced on a weekly basis
Analytical verification of doses or concentrations:
yes
Details on analytical verification of doses or concentrations:
during test week 1, 2, 4, 8 and 13 by
Enseco Inc, Cambridge MA and additionally by American BiogenicsCorporation, Decatur IL
Duration of treatment / exposure:
13 w
Frequency of treatment:
once daily
Doses / concentrations
Remarks:
Doses / Concentrations:
50, 175, 600 mg/kg bw/day in corn oil
Basis:
actual ingested
No. of animals per sex per dose:
30 animals /sex/dose
Control animals:
yes, concurrent vehicle
Details on study design:
Post-exposure period: no
Positive control:
no data

Examinations

Observations and examinations performed and frequency:
CAGE SIDE OBSERVATIONS: Yes
- Time schedule: twice daily for mortality and clinical signs

BODY WEIGHT: Yes
- Time schedule for examinations: day 1 and then weekly

FOOD EFFICIENCY:
- Body weight gain in kg/food consumption in kg per unit time X 100 calculated as time-weighted averages from the consumption
and body weight gain data: Yes , weekly

OPHTHALMOSCOPIC EXAMINATION: Yes
- Time schedule for examinations: during quarantine period and in test week 13

HAEMATOLOGY: CLINICA CHEMISTRY : Urinalysis Yes
- Time schedule for collection of blood: as baseline clinical pathology, at test week 7 (interim kill) at study termination
- How many animals: 10 rats/sex/dose
- Parameters checked : see section "additional iformation on materials and methods"


NEUROBEHAVIOURAL EXAMINATION: No data
Sacrifice and pathology:
GROSS PATHOLOGY: Yes (see section " any other information on materials and method"
HISTOPATHOLOGY: Yes (see section"Any other information on materials and method"
Other examinations:
no data
Statistics:
One-Way Analysis of Variance tests, Dunnett's t test

Results and discussion

Results of examinations

Clinical signs:
effects observed, treatment-related
Mortality:
mortality observed, treatment-related
Body weight and weight changes:
effects observed, treatment-related
Food consumption and compound intake (if feeding study):
no effects observed
Food efficiency:
not specified
Water consumption and compound intake (if drinking water study):
not specified
Ophthalmological findings:
no effects observed
Haematological findings:
no effects observed
Clinical biochemistry findings:
no effects observed
Urinalysis findings:
no effects observed
Behaviour (functional findings):
not examined
Organ weight findings including organ / body weight ratios:
no effects observed
Gross pathological findings:
no effects observed
Histopathological findings: non-neoplastic:
no effects observed
Histopathological findings: neoplastic:
no effects observed
Details on results:
see section: "Remarks on results "

Effect levels

Dose descriptor:
NOAEL
Effect level:
50 mg/kg bw/day (actual dose received)
Sex:
male/female
Basis for effect level:
other: >= 175 mg/kg bw/day animals revealed central nervous system depression and showed statistically significant reduction in body weight and body weight gain

Target system / organ toxicity

Critical effects observed:
not specified

Any other information on results incl. tables

RS-Freetext:
600 mg/kg bw/day:
mortality 19/30 females and 9/30 males,
Body weight: reduction body weight of females were unaffected 600 mg/kg bw/d, males: significant during week 2 through 10 175 mg/kg bw/d, males: significant during week 2 Body weight gain 175 and 600 mg/kg bw/d reduction in body weight gain (males), slight decrease in food intake;
600 mg/kg bw/day, males and females, 175 mg/kg bw/d: 1 female d23 and 1 female d27
Treatment-related depression of the central nervous system:
lethargy, dyspnoe, tremor and/or convulsions, recovering
within 1 h after dosing
no effects on clinical chemistry, hematology, urinalyses parameters,
no treatment-related ophthalmic lesions,
no effects on organ weights, no treatment-related gross and histomorphologic lesions;

Applicant's summary and conclusion

Executive summary:

According to Sontag JM, Page NP, Saffotti U, NCI, DHEW Publication No (NIH)78-ß01 Guidelines for Carcinogen Bioassay in small rodents) male and female rats were applied with 0, 50,175, 600 mg/kg bw/day by gavage for 13 weeks. The NOAEL is 50 mg/kg bw/day based on clinical signs and effects on body weights from 175 mg/kg bw /day onwards..