4'-chloro-3-hydroxy-2-naphthanilide

Genetic toxicity: in vitro

Administrative data

Endpoint:

in vitro gene mutation study in bacteria

Remarks:

Type of genotoxicity: gene mutation

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1988

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: performed in accordance with OECD and GLP guidelines

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1988

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 471 (Bacterial Reverse Mutation Assay)

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 472 (Genetic Toxicology: Escherichia coli, Reverse Mutation Assay)

GLP compliance:

yes (incl. QA statement)

Type of assay:

bacterial reverse mutation assay

Test material

Test material information

Constituent 1

Reference substance name:

4'-chloro-3-hydroxy-2-naphthanilide

EC Number:

202-189-7

EC Name:

4'-chloro-3-hydroxy-2-naphthanilide

Cas Number:

92-78-4

Molecular formula:

C17H12ClNO2

IUPAC Name:

N-(4-chlorophenyl)-3-hydroxy-2-naphthamide

Method

Species / strain

Species / strain 1

Species / strain / cell type:

S. typhimurium TA 1535, TA 1537, TA 98 and TA 100

Species / strain 2

Species / strain / cell type:

S. typhimurium TA 1538

Species / strain 3

Species / strain / cell type:

E. coli WP2 uvr A

Metabolic activation:

with and without

Metabolic activation system:

rat liver S9-mix

Test concentrations with justification for top dose:

1st experiment: 4 - 10000 µg/plate
2nd experiment: 4 - 5000 µg/plate

Vehicle / solvent:

Tested substance suspended in 100 µL DMSO

Controls

Controls 1

Untreated negative controls:

no

Negative solvent / vehicle controls:

yes

True negative controls:

no

Positive controls:

yes

Positive control substance:

other: sodium azide (TA100, TA1535), 9-aminoacridine (TA1537), 2-nitrofluorene (TA98, TA1538), N-methyl-N'-nitro-N-nitrosoguanidine=MNNG (WP2uvrA)

Remarks:

without metabolic activation

Controls 2

Untreated negative controls:

no

Negative solvent / vehicle controls:

yes

True negative controls:

no

Positive controls:

yes

Positive control substance:

other: 2-aminoanthracene (all strains), benzo[a]pyrene (all strains)

Details on test system and experimental conditions:

Method of application: in agar (plate incorporation)
Duration of incubation: 48h - 72h at 37°C in the dark

Evaluation criteria:

Increase of revertant colonies

Statistics:

Number of colonies per plate for each strain as well as mean values of the colonies of 3 plates/dose were counted, corrected to the next higher integer.

Results and discussion

Test results

Test results 1

Species / strain:

S. typhimurium TA 1535, TA 1537, TA 98 and TA 100

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

no cytotoxicity

Vehicle controls validity:

valid

Untreated negative controls validity:

not examined

Positive controls validity:

valid

Test results 2

Species / strain:

S. typhimurium TA 1538

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

no cytotoxicity

Vehicle controls validity:

valid

Untreated negative controls validity:

not examined

Positive controls validity:

valid

Test results 3

Species / strain:

E. coli WP2 uvr A

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

no cytotoxicity

Vehicle controls validity:

valid

Untreated negative controls validity:

not examined

Positive controls validity:

valid

Additional information on results:

Visible precipitation of the test compound was observed at 500 µg/plate and above.

Remarks on result:

other: all strains/cell types tested

Remarks:

Migrated from field 'Test system'.

Applicant's summary and conclusion

Conclusions:

Interpretation of results (migrated information):
negative with metabolic activation
negative without metabolic activation

The test substance was not mutagenic in the presence and absence of a metabolizing system in Salmonella typhimurium and Escherichia coli.

Executive summary:

Naphtol AS-E was tested for mutagenicity with the strains TA 100, TA1535, TA 1537, TA 1538, TA 98 of Salmonella typhimurium and Escherichia coli WP2uvrA.

The mutagenicity studies were conducted in the absence and in the presence of a metabolizing system derived from rat liver homogenate. A dose range of 6 different doses from 4 ~g/plate to 5 000 ~g/plate was used.

Toxicity: The test compound proved to be not toxic to the bacterial strains. 5 000 ~g/plate was chosen as top dose level for the mutagenicity study.

Mutagenicity: In the absence of the metabolic activation system the test compound did not show a dose dependent increase in the number of revertants in any of the bacterial strains. Also in the presence of a metabolic activation system, treatment of the cells with Naphtol AS-RL did not result in relevant increases in the number of revertant colonies.

It can be stated that Naphtol AS-E is not mutagenic in these bacterial test systems neither with nor without exogenous metabolic activation at the dose levels investigated.