2-butyryl-3-hydroxy-5-thiocyclohexan-3-yl-cyclohex-2-en-1-one

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

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: GLP guideline study with minor restrictions

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1996

Report date:

1996

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 471 (Bacterial Reverse Mutation Assay)

GLP compliance:

yes

Type of assay:

bacterial reverse mutation assay

Test material

Test material information

Constituent 1

Reference substance name:

-

EC Number:

425-150-8

EC Name:

-

Cas Number:

94723-86-1

Molecular formula:

C15 H22 O3 S

IUPAC Name:

2-butanoyl-3-hydroxy-5-(thian-3-yl)cyclohex-2-en-1-one

Details on test material:

- Test substance: 625-Triketone
- Test substance No.: 95/225-1
- CAS No.: 94723-86-1
- Batch No.: LJ 27 881/1
- Date of manufacturing: July 18 - 27, 1995
- Degree of purity: 99.4%
- Appearance, consistency: Beige powder
- Storage: Refrigerator

Method

Target gene:

histidine operon and tryptophan operon

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:

E. coli WP2 uvr A

Metabolic activation:

with and without

Metabolic activation system:

rat liver S9 mix (Aroclor 1254-induced)

Test concentrations with justification for top dose:

0; 20; 100; 500; 2500 and 5000 µg/plate

Vehicle / solvent:

- Vehicle(s)/solvent(s) used: DMSO

Controls

Controls 1

Untreated negative controls:

yes

Negative solvent / vehicle controls:

yes

True negative controls:

no

Positive controls:

yes

Positive control substance:

other: 2.5 µg (S.typhimurium) or 60 µg (E.coli) 2-aminoanthracene in DMSO

Remarks:

with S-9 mix

Controls 2

Untreated negative controls:

yes

Negative solvent / vehicle controls:

yes

True negative controls:

no

Positive controls:

yes

Positive control substance:

N-ethyl-N-nitro-N-nitrosoguanidine

Remarks:

without S-9 mix; for strains TA100 and TA1535

Migrated to IUCLID6: 5 µg in DMSO

Controls 3

Untreated negative controls:

yes

Negative solvent / vehicle controls:

yes

True negative controls:

no

Positive controls:

yes

Positive control substance:

other: 10 µg 4-nitro-o-phenylendiamine in DMSO

Remarks:

without S-9 mix for strain TA98

Controls 4

Untreated negative controls:

yes

Negative solvent / vehicle controls:

yes

True negative controls:

no

Positive controls:

yes

Positive control substance:

9-aminoacridine

Remarks:

without S-9 mix for strain TA1537

Migrated to IUCLID6: 100 µg in DMSO

Controls 5

Untreated negative controls:

yes

Negative solvent / vehicle controls:

yes

True negative controls:

no

Positive controls:

yes

Positive control substance:

N-ethyl-N-nitro-N-nitrosoguanidine

Remarks:

without S-9 mix for E.coli Wp2 uvrA

Migrated to IUCLID6: 10 µg in DMSO

Details on test system and experimental conditions:

METHOD OF APPLICATION: in agar (standard plate test)
DURATION
- Growth/exposure period: 48-72 h, in the dark; with addition of S-9 or phosphate buffer, respectively

METHOD OF APPLICATION: preincubation test
DURATION
- Preincubation period: 20 min, with addition of S-9 mix if required
- Growth/exposure period: 48-72 h, in the dark

GROWTH MEDIA:
- S.typhimurium: Vogel-Bonner E medium + 20 g/L D-glucose
- E.coli: SAI selective agar

NUMBER OF COLONIES EVALUATED: all revertant colonies

DETERMINATION OF CYTOTOXICITY
- Method: reduced his- background growth, decrease in the number of his+ revertants, titer determination

ANALYSIS OF BACTERIA STRAINS:
- The Salmonella strains are checked for the following characteristics at regular intervals: deep rough character (rfa); UV sensitivity (A uvrB); ampicillin resistance (R factor plasmid). Histidine and tryptophan auxotrophy is automatically checked in each experiment via the spontaneous rate.

OTHER:
- Three test replications per dose were performed.

Evaluation criteria:

In general, a substance to be characterized as positive in the bacterial tests has to fulfill the following requirements:
- doubling of the spontaneous mutation rate (control)
- dose-response relationship
- reproducibility of the results.

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:

cytotoxicity

Remarks:

≥ 2500 µg/plate

Vehicle controls validity:

valid

Untreated negative controls validity:

not applicable

Positive controls validity:

valid

Test results 2

Species / strain:

E. coli WP2 uvr A

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

cytotoxicity

Remarks:

≥ 2500 µg/plate

Vehicle controls validity:

valid

Untreated negative controls validity:

not applicable

Positive controls validity:

valid

Additional information on results:

TEST-SPECIFIC CONFOUNDING FACTORS
- Precipitation: No test substance specific precipitations

Remarks on result:

other: all strains/cell types tested

Remarks:

Migrated from field 'Test system'.

Any other information on results incl. tables

Under the chosen test conditions, 625 -Triketone is not mutagenic in bacteria.