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EC number: 442-650-1 | CAS number: 56450-90-9
Endpoint summary
Administrative data
Key value for chemical safety assessment
Genetic toxicity in vitro
Description of key information
The genetic toxicity potential of magnesium sodium fluoride silicate was examined in a guideline study similar to OECD 471 (Ames test). Magnesium sodium fluoride silicate has no mutagenic potential under the condictions of the study.
Link to relevant study records
- Endpoint:
- in vitro gene mutation study in bacteria
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2004-04-8 to 2004-06-28
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- JAPAN: Guidelines for Screening Mutagenicity Testing Of Chemicals
- Version / remarks:
- 2003-11-13
- GLP compliance:
- yes
- Type of assay:
- bacterial reverse mutation assay
- Specific details on test material used for the study:
- SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: Topy Indsutries Ltd. / 040430
- Expiration date of the lot/batch: does not expire
STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: 19.6 to 25.7 °C under dehumified conditions in a container
- Stability under test conditions: stable
- Solubility and stability of the test substance in the solvent/vehicle: soluble and stable
- Reactivity of the test substance with the solvent/vehicle of the cell culture medium: no - Species / strain / cell type:
- S. typhimurium TA 1535, TA 1537, TA 98 and TA 100
- Species / strain / cell type:
- E. coli WP2 uvr A
- Metabolic activation:
- with and without
- Metabolic activation system:
- S9 mix
- Test concentrations with justification for top dose:
- 5000, 2500, 1250, 625, 312.5 and 156.3 µg/plate for TA98 in the presence of S9 mix.
1250, 625, 312.5 and 156.3 µg/plate for TA1537 in the presence of S0 mix.
5000, 2500, 1250, 625 and 312.5 µg/plate for all bacterial strains in the absence of S9 mix and for TA100, TA1535, and WP2uvrA in the presence of S9 mix.
The top dose of 5000 µg/plate was the dose in the dose-finding test. - Vehicle / solvent:
- - Vehicle(s)/solvent(s) used: CMSO
- Justification for choice of solvent/vehicle: good solubility of test substance, negative genetic toxicity - Untreated negative controls:
- yes
- Negative solvent / vehicle controls:
- yes
- True negative controls:
- yes
- Positive controls:
- yes
- Positive control substance:
- sodium azide
- other: 2-(2-Furyl)-3-(5-nitro-2-furyl)acrylamide, 9-Aminoacridine h
- Details on test system and experimental conditions:
- METHOD OF APPLICATION: in medium; in agar (plate incorporation)
DURATION
- Preincubation period: 20 min
- Exposure duration: 48 h
- Expression time (cells in growth medium): 48 h
NUMBER OF REPLICATIONS: 2
METHODS OF SLIDE PREPARATION AND STAINING TECHNIQUE USED: After incubation, the presence or absence of precipiates on the plates was observed macroscopically. As a result, it was found to be difficult to count the number of revertant colonies with a colony analyzer, since the shape of the precipitates on the plates treated with magnesium sodium fluoride silicate was similar to that of colonies. Therefore, the number of revertant colonies on the plates treated with the negative control substance and the number of revertant colonies on the plates treated with magnesium sodium fluoride silicate were counted by hand with a handy colony counter.
The number of revertant colonies on the plates treated with positive control substances was counted with a colony analyzer. Then presence or absence or absence of batierial growth inhibition was examined using a microscope at 100-fold magnification.- Rationale for test conditions:
- Guideline
- Evaluation criteria:
- The number of revertant colonies on the plates treated with magnesium sodium fluoride silicate was less than twice the number of colonies on the plates treated witgh the negative control substance for all baterial strains in the absence and presence of S9 mix.
- Statistics:
- The mean number of revertant colonies was calculated for each concentration. Statistical analysis was not perforemd since results were evaluated following the evaluation criteria described.
- Key result
- Species / strain:
- S. typhimurium TA 1537
- Metabolic activation:
- with and without
- Genotoxicity:
- negative
- Cytotoxicity / choice of top concentrations:
- no cytotoxicity
- Vehicle controls validity:
- valid
- Untreated negative controls validity:
- valid
- Positive controls validity:
- valid
- Key result
- Species / strain:
- S. typhimurium TA 98
- Metabolic activation:
- with and without
- Genotoxicity:
- negative
- Cytotoxicity / choice of top concentrations:
- no cytotoxicity
- Vehicle controls validity:
- valid
- Untreated negative controls validity:
- valid
- Positive controls validity:
- valid
- Key result
- 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:
- valid
- Positive controls validity:
- valid
- Key result
- Species / strain:
- S. typhimurium TA 1535
- Metabolic activation:
- with and without
- Genotoxicity:
- negative
- Cytotoxicity / choice of top concentrations:
- no cytotoxicity
- Vehicle controls validity:
- valid
- Untreated negative controls validity:
- valid
- Positive controls validity:
- valid
- Key result
- Species / strain:
- S. typhimurium TA 100
- Metabolic activation:
- with and without
- Genotoxicity:
- negative
- Cytotoxicity / choice of top concentrations:
- no cytotoxicity
- Vehicle controls validity:
- valid
- Untreated negative controls validity:
- valid
- Positive controls validity:
- valid
- Conclusions:
- Magnesium sodium fluoride silicate has no mutagenic potential under the conditions of the study.
- Executive summary:
The genetic toxicity potential of magnesium sodium fluoride silicate was examined in a guideline study similar to OECD 471 (Ames test). Magnesium sodium fluoride silicate has no mutagenic potential under the conditions of the study.
Reference
Endpoint conclusion
- Endpoint conclusion:
- no adverse effect observed (negative)
Additional information
Justification for classification or non-classification
Magnesium sodium fluoride silicate has no mutagenic potential under the condictions of the study.
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