Reaction mass of bis[4-(vinyloxy)butyl] hexane-1,6-diylbiscarbamate and 9,18-dioxo-3,8,19-trioxa-10,17-diazapentacos-1-en-25-yl [6-({[4-(vinyloxy)butoxy]carbonyl}amino)hexyl]carbamate

Genetic toxicity: in vitro

Administrative data

Endpoint:

in vitro gene mutation study in bacteria

Type of information:

experimental study

Adequacy of study:

key study

Study period:

10 June, 2013 - 08 July, 2013

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2013

Report date:

2013

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 471 (Bacterial Reverse Mutation Assay)

Version / remarks:

(1997)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.13/14 (Mutagenicity - Reverse Mutation Test Using Bacteria)

Version / remarks:

(2008)

Deviations:

no

GLP compliance:

yes

Type of assay:

bacterial reverse mutation assay

Test material

Test material information

Constituent 1

Reference substance name:

-

EC Number:

420-990-1

EC Name:

-

Cas Number:

146421-65-0

Molecular formula:

C20H36N2O6

IUPAC Name:

4-(ethenyloxy)butyl N-[6-({[4-(ethenyloxy)butoxy]carbonyl}amino)hexyl]carbamate

Constituent 2

Reference substance name:

4-(ethenyloxy)butyl N-{6-[({[6-({[6-({[4-(ethenyloxy)butoxy]carbonyl}amino)hexyl]carbamoyl}oxy)hexyl]oxy}carbonyl)amino]hexyl}carbamate

Cas Number:

1516571-16-6

Molecular formula:

C34H62N4O10

IUPAC Name:

4-(ethenyloxy)butyl N-{6-[({[6-({[6-({[4-(ethenyloxy)butoxy]carbonyl}amino)hexyl]carbamoyl}oxy)hexyl]oxy}carbonyl)amino]hexyl}carbamate

Details on test material:

- Name of test material (as cited on the label): URACROSS ZW7672P, Product ID 021116/000
- Storage condition of test material: At room temperature in the dark
- Stability under storage conditions: Stable

Method

Target gene:

- S. typhimurium: Histidine gene
- E. coli: Tryptophan gene

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 induced by a combination of phenobarbital and ß-naphthoflavone

Test concentrations with justification for top dose:

Experiment 1: TA1535, TA1537, TA98, TA100 and WP2uvrA
Without and with S9-mix: 10, 33, 100, 333, 1000 and 3330 µg/plate
Experiment 2: TA1535, TA1537, TA98, TA100 and WP2uvrA
Without and with S9-mix: 10, 33, 100, 333 and 1000 µg/plate

Vehicle / solvent:

- Vehicle(s)/solvent(s) used: DMSO
- Justification for choice of solvent/vehicle:
A solution or a homogeneous suspension could be obtained in DMSO and DMSO is accepted and approved by authorities and international guidelines
Test substance concentrations were used within 2.5 hrs. after preparation.

Controls

Controls 1

Untreated negative controls:

no

Negative solvent / vehicle controls:

yes

Positive controls:

yes

Positive control substance:

methylmethanesulfonate

Remarks:

without S9 Migrated to IUCLID6: 650 µg/plate in DMSO for TA100

Controls 2

Untreated negative controls:

no

Negative solvent / vehicle controls:

yes

Positive controls:

yes

Positive control substance:

other: 2-nitrofluorene 10 µg/plate in DMSO for TA98

Remarks:

without S9

Controls 3

Untreated negative controls:

no

Negative solvent / vehicle controls:

yes

Positive controls:

yes

Positive control substance:

other: ICR-191 2.5 µg/plate in DMSO for TA1537

Remarks:

without S9

Controls 4

Untreated negative controls:

no

Negative solvent / vehicle controls:

yes

Positive controls:

yes

Positive control substance:

4-nitroquinoline-N-oxide

Remarks:

without S9 Migrated to IUCLID6: 10 µg/plate in DMSO for WP2uvrA

Controls 5

Untreated negative controls:

no

Negative solvent / vehicle controls:

yes

Positive controls:

yes

Positive control substance:

sodium azide

Remarks:

without S9 Migrated to IUCLID6: 5 µg/plate in saline for TA1535

Controls 6

Untreated negative controls:

no

Negative solvent / vehicle controls:

yes

Positive controls:

yes

Positive control substance:

other: 2-aminoanthracene in DMSO for all tester strains

Remarks:

with S9

Details on test system and experimental conditions:

METHOD OF APPLICATION: in agar (plate incorporation)

DURATION
- Exposure duration: 48 hour

NUMBER OF REPLICATIONS:
- Doses of the test substance were tested in triplicate in each strain. Two independent experiments were conducted.

NUMBER OF CELLS EVALUATED: 10E8 per plate

DETERMINATION OF CYTOTOXICITY
- Method: The reduction of the bacterial background lawn, the increase in the size of the microcolonies and the reduction of the revertant colonies.

OTHER EXAMINATIONS:
- The presence of precipitation of the test compound on the plates was determined.

Evaluation criteria:

A test substance is considered negative (not mutagenic) in the test if:
a) The total number of revertants in tester strain TA100 is not greater than two (2) times the concurrent control, and the total number of revertants in tester strains TA1535, TA1537, TA98 or WP2uvrA is not greater than three (3) times the concurrent control.
b) The negative response should be reproducible in at least one independently repeated experiment.

A test substance is considered positive if:
a) The total number of revertants in tester strain TA100 is greater than two (2) times the concurrent control, or the total number of revertants in tester strains TA1535, TA1537, TA98 or WP2uvrA is greater than three (3) times the concurrent vehicle control.
b) In case a repeat experiment is performed when a positive response is observed in one of the tester strains, the positive response should be reproducible in at least one independently repeated experiment.

Statistics:

Not performed.

Results and discussion

Test results

Test results 1

Species / strain:

S. typhimurium TA 100

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

no cytotoxicity, but tested up to precipitating concentrations

Vehicle controls validity:

valid

Positive controls validity:

valid

Test results 2

Species / strain:

S. typhimurium TA 98

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

no cytotoxicity, but tested up to precipitating concentrations

Vehicle controls validity:

valid

Positive controls validity:

valid

Test results 3

Species / strain:

S. typhimurium TA 1537

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

no cytotoxicity, but tested up to precipitating concentrations

Vehicle controls validity:

valid

Positive controls validity:

valid

Test results 4

Species / strain:

S. typhimurium TA 1535

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

no cytotoxicity, but tested up to precipitating concentrations

Vehicle controls validity:

valid

Positive controls validity:

valid

Test results 5

Species / strain:

E. coli WP2 uvr A

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

no cytotoxicity, but tested up to precipitating concentrations

Vehicle controls validity:

valid

Positive controls validity:

valid

Additional information on results:

TEST-SPECIFIC CONFOUNDING FACTORS
- Precipitation: Slight precipitation was observed at the dose level of 1000 µg/plate and moderate precipitation was observed at the dose level of 3330 µg/plate.

COMPARISON WITH HISTORICAL CONTROL DATA:
- The negative and strain-specific positive control values were within our laboratory historical control data ranges indicating that the test conditions were adequate and that the metabolic activation system functioned properly.

ADDITIONAL INFORMATION ON CYTOTOXICITY and MUTAGENICITY:
- In strain TA100 in the first experiment, a 2.2-fold increase in the number of revertant colonies was observed at the highest dose level of 3330 μg/plate in the absence of S9-mix. Since the increase was below the maximum historical solvent control data range, no dose response was observed and the increase was only observed at the moderate precipitating top dose, this increase is considered to be not biologically relevant.
In strain TA1535 (second experiment), a fluctuation in the mean number of revertant colonies above the laboratory historical control data range was observed in the absence of S9-mix at the dose level of 3330 μg/plate. However, since the increase was not three-fold (a maximum of 1.1-fold was reached), this increase was not considered to be relevant.
- In all other strains, no toxicity or mutagenicity was observed up to and including the top dose of 1000 and 3330 µg/plate.

Applicant's summary and conclusion

Conclusions:

The substance is not mutagenic in the Salmonella typhimurium reverse mutation assay and in the Escherichia coli reverse mutation assay, performed according to OECD 471 and GLP principles.

Executive summary:

The genetic toxicity of the substance was assessed using Salmonella typhimurium TA98, TA100, TA1535 and TA1537 strains, and Escherichia coli WP2uvrA strain, in accordance with OECD guideline 471 and GLP principles. All bacterial strains showed negative responses over the entire dose range, i.e. no biologically significant dose-related increase in the number of revertants in two independently repeated experiments with and without metabolic activation. Precipitation was observed at the highest concentration tested.

Based on the results it is concluded that the substance is not mutagenic in the Salmonella typhimurium reverse mutation assay and in the Escherichia coli reverse mutation assay.