2-[7-(diethylamino)-2-oxo-2H-1-benzopyran-3-yl]-1,3-dimethyl-1H-benzimidazolium chloride

Genetic toxicity: in vitro

Administrative data

Endpoint:

in vitro gene mutation study in bacteria

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Justification for type of information:

Data is from peer reviewed publication

Data source

Reference

Reference Type:

publication

Title:

Evaluation of Laser Dye Mutagenicity Using the Ames/Salmonella Microsome Test

Author:

Barbara J.Y. Wuebbles and James S. Felton

Year:

1985

Bibliographic source:

Environmental Mutagenesis 7511-522 (1985)

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: Refer below principle

Principles of method if other than guideline:

Gene mutation study was performd to evaluate the mutagenic nature of the test compound Coumarin 30 using Salmonella typhimurium strain TA1538, TA98 and TA100

GLP compliance:

not specified

Type of assay:

bacterial gene mutation assay

Test material

Test material information

Constituent 1

Reference substance name:

7-(diethylamino)-3-(1-methyl-1H-benzimidazol-2-yl)-2-benzopyrone

EC Number:

255-186-8

EC Name:

7-(diethylamino)-3-(1-methyl-1H-benzimidazol-2-yl)-2-benzopyrone

Cas Number:

41044-12-6

IUPAC Name:

7-(diethylamino)-3-(1-methyl-1H-benzimidazol-2-yl)-2H-chromen-2-one

Details on test material:

- Name of test material (as cited in study report): Coumarin 30
- Molecular formula (if other than submission substance): C21H21N3O2
- Molecular weight (if other than submission substance): 347.4159 g/mol
- Substance type: Organic
- Physical state: No data available
- Purity: No data available
- Impurities (identity and concentrations): No data available

Specific details on test material used for the study:

- Name of test material: Coumarin 30
- IUPAC name: 7-(diethylamino)-3-(1-methyl-1H-benzimidazol-2-yl)-2H-chromen-2-one
- Molecular formula: C21H21N3O2
- Molecular weight: 347.4159 g/mol
- Substance type: Organic

Method

Target gene:

Histidine

Species / strain

Species / strain / cell type:

S. typhimurium, other: TA1538, TA98 and TA100

Details on mammalian cell type (if applicable):

Not applicable

Additional strain / cell type characteristics:

not specified

Cytokinesis block (if used):

not specified

Metabolic activation:

with and without

Metabolic activation system:

S9 metabolic ativation system

Test concentrations with justification for top dose:

0.1 or 1 mg/plate

Vehicle / solvent:

- Vehicle(s)/solvent(s) used: DMSO
- Justification for choice of solvent/vehicle: the test chemical was soluble in DMSO

Controls

Untreated negative controls:

not specified

Negative solvent / vehicle controls:

not specified

True negative controls:

not specified

Positive controls:

not specified

Positive control substance:

not specified

Details on test system and experimental conditions:

METHOD OF APPLICATION: in agar (plate incorporation)

DURATION
- Preincubation period: No data available
- Exposure duration: 2 days
- Expression time (cells in growth medium): 2 days
- Selection time (if incubation with a selection agent): No data available
- Fixation time (start of exposure up to fixation or harvest of cells): No data available

SELECTION AGENT (mutation assays): No data available
SPINDLE INHIBITOR (cytogenetic assays): No data available
STAIN (for cytogenetic assays): No data available

NUMBER OF REPLICATIONS: duplicate

NUMBER OF CELLS EVALUATED: No data available

DETERMINATION OF CYTOTOXICITY
- Method: mitotic index; cloning efficiency; relative total growth; other: No data available

OTHER EXAMINATIONS: No data available
- Determination of polyploidy: No data available
- Determination of endoreplication: No data available
- Other: No data available

OTHER: No data available

Rationale for test conditions:

No data

Evaluation criteria:

A sample was judged mutagenic if it produced greater than twice the spontaneous background colonies at more than one dose or at the highest dose tested.

Statistics:

To estimate mutagenic potency (revertant/µg) from linear dose-response curves, the method of Moore and Felton was used

Results and discussion

Test results

Species / strain:

S. typhimurium, other: TA1538, TA98 and TA100

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

not specified

Vehicle controls validity:

not specified

Untreated negative controls validity:

not specified

Positive controls validity:

not specified

Additional information on results:

TEST-SPECIFIC CONFOUNDING FACTORS
- Effects of pH: No data available
- Effects of osmolality: No data available
- Evaporation from medium: No data available
- Water solubility: No data available
- Precipitation: No data available
- Other confounding effects: Almost insoluble in DMSO

RANGE-FINDING/SCREENING STUDIES: Spot test was performed with and without activation using the Salmonella typhimurium strains TA1538, TA98 and TA100. The spot test results were inconclusive. The dyes were than screened at 0.1 mg/plate and 1 mg/plate.

COMPARISON WITH HISTORICAL CONTROL DATA: No data available

ADDITIONAL INFORMATION ON CYTOTOXICITY: No data available

Remarks on result:

other: No mutagenic effects were observed

Applicant's summary and conclusion

Conclusions:

Coumarin 30 did not induce gene toxicity in the Salmonella typhimurium strains TA1538, TA98 and TA100 in the presence and absence of S9 metabolic activation system and hence it is negative for gene mutation in vitro.

Executive summary:

Gene mutation study was performd to evaluate the mutagenic nature of the test compound Coumarin 30 using Salmonella typhimurium strain TA1538, TA98 and TA100 with and without S9 metabolic activation system. Bacteria were grown overnight in Oxoid nutrient broth, then refrigerated at 4-5^OC for a few hours before use. 0.1 ml of bacterial culture was added to 2 ml of 45°C molten top agar containing 0.01 mg histidine HCI and 0.012 mg biotin/ml, followed by the 0.1 or 1.0 mg/plate test sample in ≤0.2 ml DMSO. Finally, 0.5 ml of sodium phosphate buffer, pH 7.4 (no activation), or 0.5 ml of Aroclor-induced rat S9 mixture was added, and the mixture was poured on minimal glucose agar plates. Histidine revertant colonies were counted on a Biotran II automated colony counter after a 2-day incubation at 37°C. A sample was judged mutagenic if it produced greater than twice the spontaneous background colonies at more than one dose or at the highest dose tested. Coumarin 30 did not induce gene toxicity in the Salmonella typhimurium strains TA1538, TA98 and TA100 in the presence and absence of S9 metabolic activation system and hence it is negative for gene mutation in vitro.