4-methylbenzophenone

Skin sensitisation

Administrative data

Endpoint:

skin sensitisation: in vivo (non-LLNA)

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Remarks:

Modified Draize test. In this test, sensitization was induced by 4 (instead of 10) intradermal injections followed by intradermal and topical challange procedures. The test modification as compared to the original Draize method was validated by the performing Laboratory. Therefore the results of the investigation are considered valid. No individal scores were presented in this publication.

Data source

Reference

Reference Type:

publication

Title:

The sensitization potential of some perfume ingredients tested using a modified draize procedure

Author:

Sharp DW

Year:

1978

Bibliographic source:

Toxicology 9, 261-271

Materials and methods

Test guideline

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 406 (Skin Sensitisation)

Version / remarks:

Maximisation test

Deviations:

yes

Remarks:

modified Draize test

Principles of method if other than guideline:

Modified Draize test. In the Draize test, sensitization is induced by 10 intradermal injections. In this study, the equivalent total dose was administered on one occasion as 4 intradermal injections.

GLP compliance:

no

Remarks:

at the time the study was performed, GLP was not compulsory

Type of study:

Draize test

Justification for non-LLNA method:

Study was performed in 1978

Test material

Test material information

Constituent 1

Reference substance name:

Benzophenone

EC Number:

204-337-6

EC Name:

Benzophenone

Cas Number:

119-61-9

Molecular formula:

C13H10O

IUPAC Name:

benzophenone

Details on test material:

- Name of test material (as cited in study report): Benzophenone
- Analytical purity: The test item used was from commercial batches which had passed quality control checks

In vivo test system

Test animals

Species:

guinea pig

Strain:

Dunkin-Hartley

Sex:

male/female

Details on test animals and environmental conditions:

TEST ANIMALS
- Source: Own colony inbred
- Weight at study initiation: 350 g

Results and discussion

In vivo (non-LLNA)

Results

Key result

Reading:

other: not further specified

Dose level:

0.25-20%

No. with + reactions:

0

Total no. in group:

10

Any other information on results incl. tables

Scoring: Each injection reaction was given a total score based on size (2 largest diameters), erythema and oedema. Individual reactions were considered positive when their total score was significantly greater than the average for total score for control reactions. Application reactions were scored on a 0 to +++ scale and individual reactions were considered positiveif they were a) + or greater and b) there were no erythema reactions in controls.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

In this modified Magnusson Kligman maximisation test, benzophenone did not show a sensitizing effect in guinea pigs.

Executive summary:

Benzophenone was applied to 10 guinea pigs in a modified Draize test. After induction (Day 0) with 4 intradermal injections to each animal with a 1% benzophenone concentration, combined intradermal (0.25% benzophenone) and topical challenge (20% benzophenone) procedures followed on day 14 and were repeated on days 35 and 42.

Benzophenone did not show a sensitising response in this test system and is thus considered to be a non-sensitising substance.