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Toxicological information

Genetic toxicity: in vitro

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Administrative data

Endpoint:
in vitro gene mutation study in bacteria
Remarks:
Type of genotoxicity: gene mutation
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Study period:
From 21 August, 2006 to 01 November, 2006
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Read across study hence maximum reliability rating of 2 assigned according to ECHA guidance, although study was conducted according to the OECD guideline 471 and Commission Directive 2000/32/EC, Annex-4D as well as in compliance with GLP.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2006
Report Date:
2006

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 471 (Bacterial Reverse Mutation Assay)
Deviations:
no
Qualifier:
according to
Guideline:
other: Commission Directive 2000/32/EC, L1362000, Annex 4D
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of assay:
bacterial reverse mutation assay

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): Cetrimonium chloride
- Physical state: Colourless liquid
- Analytical purity: 25 %
- Composition of test material, percentage of components: 25 % cetrimonium chloride, 75 % water
- Lot/batch No.: CE61250001
- Stability under test conditions: Stable in water for at least 48 h
- Storage condition of test material: At room temperature

Method

Species / strain
Species / strain:
S. typhimurium TA 1535, TA 1537, TA 98, TA 100 and E. coli WP2
Metabolic activation:
with and without
Metabolic activation system:
S9 mix
Test concentrations with justification for top dose:
Experiment I (with and without S9 mix): 0.1, 0.3, 1, 3, 10, 33, 100 and 333 µg/plate
Experiment II (with and without S9 mix): 0.01, 0.03, 0.1, 0.3, 1, 3, 10, 33, 100 and 333 µg/plate
Vehicle:
- Vehicle(s)/solvent(s) used: Deionised water
- Justification for choice of solvent/vehicle: Deionised water was chosen because of its solubility properties and its low toxicity to the bacteria.
Controlsopen allclose all
Negative controls:
yes
Remarks:
Spontaneous mutation rates
Solvent controls:
yes
Remarks:
Deionised water
Positive controls:
yes
Positive control substance:
sodium azide
Remarks:
Migrated to IUCLID6: 10 µg/plate for TA 1535 and TA 100 (Without metabolic activation)
Negative controls:
yes
Remarks:
Spontaneous mutation rates
Solvent controls:
yes
Remarks:
Deionised water
Positive controls:
other:
Positive control substance:
other: 4-nitro-o-phenylene-diamine, 10 µg/plate for TA 98, 50 µg/plate for TA 1537 (Without metabolic activation)
Negative controls:
yes
Remarks:
Spontaneous mutation rates
Solvent controls:
yes
Remarks:
Deionised water
Positive controls:
yes
Positive control substance:
methylmethanesulfonate
Remarks:
Migrated to IUCLID6: 3 µL/plate for WP2 uvrA (Without metabolic activation)
Negative controls:
yes
Remarks:
Spontaneous mutation rates
Solvent controls:
yes
Remarks:
Deionised water
Positive controls:
yes
Positive control substance:
other: 2-aminoanthracene, 2.5 µg/plate for TA 1535, TA 1537, TA 98, TA 100 and 10 µg/plate for WP2 uvrA (With metabolic activation)
Details on test system and conditions:
METHOD OF APPLICATION: in agar (plate incorporation)

DURATION
- Exposure duration: 48 h

NUMBER OF REPLICATIONS: Triplicates

Evaluation criteria:
A test item is considered as a mutagen if there is a biologically relevant increase in the number of revertants exceeding the threshold by twice (strains TA 98, TA 100, and WP2 uvrA) or thrice (strains TA 1535 and TA 1537) the colony count of the corresponding solvent control.

A dose-dependent increase is considered biologically relevant if the threshold is exceeded at more than one concentration.

An increase exceeding the threshold at only one concentration is judged as biologically relevant if reproduced in an independent second experiment.

A dose-dependent increase in the number of revertant colonies below the threshold is regarded as an indication of a mutagenic potential if reproduced in an independent second experiment. However, whenever the colony counts remain within the historical range of negative and solvent controls such an increase is not considered biologically relevant.

Results and discussion

Test results
Species / strain:
S. typhimurium TA 1535, TA 1537, TA 98, TA 100 and E. coli WP2
Metabolic activation:
with and without
Genotoxicity:
negative
Cytotoxicity:
yes
Remarks:
Reduction in the number of revertants observed in the test groups (i.e., at 100 – 333, 3 – 333 µg/plate with and without S9 mix respectively in experiment I; 100 – 333, 3 – 333 µg/plate respectively with and without S9 mix in experiment II).
Vehicle controls valid:
yes
Positive controls valid:
yes
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

Under the conditions of the study, the test substance was to be non-mutagenic in S. typhimurium strains TA 1535, TA 1537, TA 98, TA 100 and E. coli strain WP2 uvrA in the reverse mutation assay.
Executive summary:

An Ames test was conducted with the read-across substance C16 TMAC (25% purity) (pre-experiment and experiment I) and the pre-incubation test (experiment II) usingSalmonella typhimuriumstrains TA 1535, TA 1537, TA 98 and TA 100 andEscherichia colistrain WP2 uvrA. The assay was performed in three independent experiments both with and without S9 mix. All positive control mutagens used in the study showed a distinct increase of induced revertant colonies. Strong toxic effects, evident as a reduction in the number of revertants, occurred in the test groups with and without metabolic activation. No substantial increase in revertant colony numbers in of any of the five tester strains was observed following treatment with the test substance either in the presence or absence of S9 mix. Under the conditions of the test, the substance was found to be non-mutagenic (Sokolowski A, 2006).