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Key value for chemical safety assessment

Genetic toxicity in vitro

Description of key information

Gene mutation in vitro (bacterial reverse mutation assay, GLP, OECD TG 471, EU Method B. 13/14, EPA OPPTS 870.5100): negative in all tested Salmonella typhimurium strains, w/wo metabolic activation
[Bayer AG, Report No. PH-34867, 2007-04-13]


Link to relevant study records
in vitro gene mutation study in bacteria
Type of information:
experimental study
Adequacy of study:
key study
Study period:
May to June 2006
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
OECD Guideline 471 (Bacterial Reverse Mutation Assay)
Version / remarks:
according to guideline
EU Method B.13/14 (Mutagenicity - Reverse Mutation Test Using Bacteria)
according to guideline
EPA OPPTS 870.5100 - Bacterial Reverse Mutation Test (August 1998)
GLP compliance:
yes (incl. QA statement)
Type of assay:
bacterial reverse mutation assay
Specific details on test material used for the study:
Batch no. : BXR34BR
purity: 99.8%
Target gene:
histidin gene locus
Species / strain / cell type:
S. typhimurium TA 1535, TA 1537, TA 98, TA 100 and TA 102
Metabolic activation:
with and without
Metabolic activation system:
Test concentrations with justification for top dose:
Oxaphthalimid: 50-5000 µg/plate
Sodium-azide: 10 µg/plate (TA 1535)
Nitrofurantoin: 0.2 µg/plate (TA 100)
4-Nitro-1,2-phenylene diamine: 10 µg/plate (TA 1537), 0.5 µg/plate (TA 98)
Mitomycin C: 0.2 µg/plate (TA 102 in plate incorporation trials)
Cumene hyperoxide: 50 µg/plate (TA 102 in preincubation trials)
2-Aminoanthracene: 3 µg/plate
Untreated negative controls:
Negative solvent / vehicle controls:
No solvent control was used since sufficient evidence was available in the literature and from testing laboratory experience, indicating that the solvents used had no influence on the spontaneous mutant counts of the used strains.
Positive controls:
Positive control substance:
other: Sodium-azide, Nitrofurantoin, 4-Nitro-1,2-phenylene diamine, Mitomycin C, Cumene hyperoxide, 2-Aminoanthracene
Details on test system and experimental conditions:
- Number of cultures per concentration: triplicate
- Number of independent experiments: 2

- Cell density at seeding (if applicable): E+06 dilution
- Test substance added in agar (plate incorporation); preincubation

- Exposure duration/duration of treatment: 48 h

- Method, e.g.: background growth inhibition
Evaluation criteria:
A reproducible and dose-related increase in mutant counts of at least one strain is considered to be a positive result. For TA 1535, TA 100 and TA 98 this increase should be about twice that of negative controls, whereas for TA 1537, at least a threefold increase should be reached. For TA 102 an increase of about 100 mutants should be reached. Otherwise, the result is evaluated as negative. However, these guidelines may be overruled by good scientific judgment.
In case of questionable results, investigations should continue, possibly with modifications, until a final evaluation is possible.
Key result
Species / strain:
S. typhimurium, other: TA 1535, TA 100, TA 1537, TA 98, TA 102
Metabolic activation:
with and without
Cytotoxicity / choice of top concentrations:
no cytotoxicity
Untreated negative controls validity:
Positive controls validity:

There was no indication of a bacteriotoxic effect of Oxaphthalimid up to and including 5000 µg/plate. No inhibition of growth was noted as well. At 1581 µg/plate, the substance started to precipitate.

not mutagenic
Executive summary:

Oxaphthalimid was initially investigated using the Salmonella/microsome plate incorporation test for point-mutagenic effects in doses up to and including 5000 µg/plate on the five histidine-auxotrophic Salmonella typhimurium LT2 strains TA 1535, TA 100, TA 1537, TA 98 and TA 102. The independent repeat was performed as preincubation for 20 minutes at 37°C.

Doses up to and including 5000 µg/plate did not cause any bacteriotoxic effects. No inhibition of growth was noted as well. Substance precipitation occurred at the dose of 1581 µg/plate and above.

No evidence of mutagenic activity of Oxaphthalimid was found without and with S9 mix.

Endpoint conclusion
Endpoint conclusion:
no adverse effect observed (negative)

Genetic toxicity in vivo

Endpoint conclusion
Endpoint conclusion:
no study available

Additional information

Oxaphthalimid was shown to be not mutagenic with and without metabolic activation in a bacterial reverse mutation assay with the S. typhimurium strains TA 1535, TA 100, TA 1537, TA 98 and TA 102. The study was conducted using the plate incorporation and preincubation method with substance concentrations from 50 to 5000 µg per plate.


Justification for classification or non-classification

Classification according to Directive 67/548/EEC and Regulation (EC) No. 1272/2008 (CLP) is not required.