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EC number: 219-730-8 | CAS number: 2512-29-0
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
![](https://echa.europa.eu./o/diss-blank-theme/images/factsheets/A-REACH/factsheet/print_toxicological-information.png)
Endpoint summary
Administrative data
Key value for chemical safety assessment
Genetic toxicity in vitro
Description of key information
The test item was assessed for its potential to induce gene mutations at the HPRT locus using V79 cells of the Chinese hamster.
No relevant and reproducible increase in mutant colony numbers was observed in the main experiments up to the maximum concentration. The mutant frequency remained well within the historical range of solvent controls.
In both experiments of this study (with and without S9 mix) the range of the solvent controls was from 3.4 up to 18.5 mutants per 106cells; the range of the groups treated with the test item was from 4.3 up to 23.4 mutants per 106cells.
EMS (150 µg/mL) and DMBA (1.1 µg/mL) were used as positive controls and showed a distinct increase in induced mutant colonies.
The test item did not induce structural chromosome aberrations in V79 cells (Chinese hamster cell line) in vitro. Therefore, the test item is considered to be non-clastogenic in this chromosome aberration test in the absence and presence of metabolic activation, when tested up to precipitating and cytotoxic concentrations.
Mutagenic activity of the test item was investigated in Salmonella typhimurium strains TA 1535, TA 1537, TA98 and TA100 without metabolic activation at concentrations of 0, 4, 20, 100, 500, 2500, 5000 µg/plate using the plate incorporation assay. Due to the test items characteristic as an azo-dye the test was also conducted using the Prival modification, i.e. testing the above mentioned bacterial strains in the preincubation assay with uninduced hamster liver S9 mix for metabolic activation. This test was performed using the concentrations 0, 4, 20, 100, 500, 2500, 5000 µg/plate.
The test item did not reveal any mutagenic activity under the conditions tested. The appropriate reference mutagenes showed distinct positive mutagenic effects.
Link to relevant study records
- Endpoint:
- in vitro gene mutation study in bacteria
- Remarks:
- Type of genotoxicity: gene mutation
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- From 22 AUG 1995 to 31 AUG 1995
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: see 'Remark'
- Remarks:
- As compared to OECD guideline 471 the study design has some methodological deviations (pre-incubation assay only with but not without metabolic activation (Prival modification for azo-dyes); investigations without metabolic activation were only tested in the plate incorporation assay; not all strains tested). But considering the characteristics of the test item the study design used completely covers the most sensitive parameters relevant for azo-dyes.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 471 (Bacterial Reverse Mutation Assay)
- Deviations:
- yes
- Remarks:
- not tested in E. coli WP2uvr A or TA 102
- Qualifier:
- according to guideline
- Guideline:
- other: EEC directive 92/69, L 383 A, Annex B14
- Deviations:
- not specified
- Qualifier:
- according to guideline
- Guideline:
- EPA OTS 798.5265 (The Salmonella typhimurium Bacterial Reverse Mutation Test)
- Deviations:
- not specified
- GLP compliance:
- yes
- Type of assay:
- bacterial reverse mutation assay
- Species / strain / cell type:
- S. typhimurium TA 1535, TA 1537, TA 98 and TA 100
- Metabolic activation:
- with
- Metabolic activation system:
- hamster liver S9 (pre-incubation test)
- Test concentrations with justification for top dose:
- 0, 4, 20, 100, 500, 2500, 5000 µg/plate
- Vehicle / solvent:
- - Vehicle(s)/solvent(s) used: DMSO
- Justification for choice of solvent/vehicle: solubility properties of the solvent - Untreated negative controls:
- yes
- Negative solvent / vehicle controls:
- yes
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- other: sodium azide (TA 100, TA1535), 9-aminoacridine (TA 1537), 2-nitrofluorene (TA 98)
- Remarks:
- without metabolic activation
- Untreated negative controls:
- yes
- Negative solvent / vehicle controls:
- yes
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- other: 2-aminoanthracene (TA 100, TA 1535, TA 1537), congo red (TA 98)
- Remarks:
- with metabolic activation
- Details on test system and experimental conditions:
- METHOD OF APPLICATION:
- plate incorporation assay: without metabolic activation
- preincubation assay: with metabolic activation with uninduced hamster liver S9 mix (30% (v/v)
DURATION
- Preincubation period: ca. 30 minutes at 30 °C
- Exposure duration: at least 48 hours
NUMBER OF REPLICATIONS: 3 plates per strain and dose level, including controls; two independent experiments for each of the two protocols (plate incorporation assay and pre-incubation assay) - Evaluation criteria:
- A test compound is classified as mutagenic if it has either of the following effects:
- it produces at least a 2-fold increase in the mean number of revertants per plate of at least one of the tester strains over the mean number of revertants per plate of the appropriate vehicle control at complete bacterial background lawn
- it induces a dose-related increase in the mean number of revertants per plate of at least one of the tester strains over the mean number of revertants per plate of the appropriate vehicle control in at least two to three concentrations of the test compound at complete bacterial background lawn - Statistics:
- Arithmetic means and standard deviation of the counted colonies were calculated, as well as the respective dose/control ratio.
- Key result
- 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:
- no cytotoxicity
- Vehicle controls validity:
- valid
- Untreated negative controls validity:
- valid
- Positive controls validity:
- valid
- Additional information on results:
- TEST-SPECIFIC CONFOUNDING FACTORS
- Precipitation: visible precipitation of the test item at 500 µg/plate and above - Conclusions:
- Interpretation of results:
negative
The test item did not exert mutagenic activity in the reverse bacterial mutation assay (plate incorporation assay without metabolic activation and preincubation assay with metabolic activation). - Executive summary:
Mutagenic activity of the test item was investigated in Salmonella typhimurium strains TA 1535, TA 1537, TA98 and TA100 without metabolic activation at concentrations of 0, 4, 20, 100, 500, 2500, 5000 µg/plate using the plate incorporation assay. Due to the test items characteristic as an azo-dye the test was also conducted using the Prival modification, i.e. testing the above mentioned bacterial strains in the preincubation assay with uninduced hamster liver S9 mix for metabolic activation. This test was performed using the concentrations 0, 4, 20, 100, 500, 2500, 5000 µg/plate.
The test item did not reveal any mutagenic activity under the conditions tested. The appropriate reference mutagenes showed distinct positive mutagenic effects.
- Endpoint:
- in vitro cytogenicity / chromosome aberration study in mammalian cells
- Remarks:
- Type of genotoxicity: chromosome aberration
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- From 07 SEP 2011 to 13 DEC 2011
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Guideline study (OECD 473) and in compliance with GLP.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 473 (In Vitro Mammalian Chromosome Aberration Test)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.10 (Mutagenicity - In Vitro Mammalian Chromosome Aberration Test)
- Deviations:
- no
- GLP compliance:
- yes
- Type of assay:
- in vitro mammalian chromosome aberration test
- Species / strain / cell type:
- Chinese hamster lung fibroblasts (V79)
- Details on mammalian cell type (if applicable):
- - Type and identity of media: minimal essential medium
- Properly maintained: yes
- Periodically checked for Mycoplasma contamination: yes
- Periodically checked for karyotype stability: yes - Metabolic activation:
- with and without
- Metabolic activation system:
- phenobarbital / beta-naphtoflavone induced rat liver S9
- Test concentrations with justification for top dose:
- With metabolic activation:
Experiment I: 1.5, 3.0, 6.0, 12.0, 24.1, 48.1, 96.3, 192.5, 385.0 µg/mL
Experiment IIB: 1.3, 2.5, 10.0, 20.0, 30.0, 40.0, 50.0, 75.0, 100.0 µg/mL
Without metabolic activation:
Experiment I: 1.5, 3.0, 6.0, 12.0, 24.1, 48.1, 96.3, 192.5, 385.0 µg/mL
Experiment IIA: 1.5, 3.0, 6.0, 12.0, 24.1, 48.1, 96.3, 192.5, 385.0 µg/mL - Vehicle / solvent:
- - Vehicle(s)/solvent(s) used: DMSO
- Justification for choice of solvent/vehicle: solubility and relatively low cytotoxicity in accordance to the OECD Guideline 473 - Untreated negative controls:
- no
- Negative solvent / vehicle controls:
- yes
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- ethylmethanesulphonate
- Remarks:
- without metabolic activation
- Untreated negative controls:
- no
- Negative solvent / vehicle controls:
- yes
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- cyclophosphamide
- Remarks:
- with metabolic activation
- Details on test system and experimental conditions:
- Three independent experiments were performed. In Experiment I the exposure period was 4 hours with and without S9 mix. In Experiment IIA the exposure period was 18 hours without S9 mix. In Experiment IIB the exposure period was 4 hours with S9 mix. The chromosomes were prepared 18 hours (Exp. I, IIA & IIB) after the start of treatment with the test item.
METHOD OF APPLICATION: in culture medium (minimal essential medium)
DURATION
- Exposure duration: 4 hours (+/- S9 mix) and 18 hours (- S9 mix)
- Fixation time (start of exposure up to fixation or harvest of cells): 18 hours
SPINDLE INHIBITOR (cytogenetic assays): Colcemid
STAIN (for cytogenetic assays): Giemsa
NUMBER OF REPLICATIONS: about 1.5
NUMBER OF CELLS EVALUATED: 100 per culture, except for the positive control in Experiment IIA without metabolic activation, where 50 metaphases were evaluated.
DETERMINATION OF CYTOTOXICITY
- Method: mitotic index and cell numbers - Evaluation criteria:
- Evaluation of the cultures was performed according to the OECD Guideline using NIKON microscopes with 100x objectives. Breaks, fragments, deletions, exchanges, and chromosome disintegrations were recorded as structural chromosome aberrations. Gaps were recorded as well but not included in the calculation of the aberration rates. 100 well spread metaphases per culture were scored for cytogenetic damage on coded slides, except for the positive control in Experiment IIA without metabolic activation, where 50 metaphases were evaluated.
Only metaphases with characteristic chromosome numbers of 22 ± 1 were included in the analysis. To describe a cytotoxic effect the mitotic index (% cells in mitosis) and relative cell numbers were determined. - Statistics:
- Statistical significance was confirmed by means of the Fisher´s exact test (p < 0.05).
- Key result
- Species / strain:
- Chinese hamster lung fibroblasts (V79)
- Metabolic activation:
- with and without
- Genotoxicity:
- negative
- Cytotoxicity / choice of top concentrations:
- cytotoxicity
- Remarks:
- details see below
- Vehicle controls validity:
- valid
- Untreated negative controls validity:
- not examined
- Positive controls validity:
- valid
- Additional information on results:
- The test item, suspended in DMSO, was assessed for its potential to induce structural chromosome aberrations in V79 cells of the Chinese hamster in vitro in the absence and presence of metabolic activation by S9 mix.
Three independent experiments were performed. In Experiment I the exposure period was 4 hours with and without S9 mix. In Experiment IIA the exposure period was 18 hours without S9 mix. In Experiment IIB the exposure period was 4 hours with S9 mix. The chromosomes were prepared 18 hours (Exp. I, IIA & IIB) after the start of treatment with the test item.
In each experimental group two parallel cultures were set up. 100 metaphases per culture were evaluated for structural chromosome aberrations, except for the positive control in Experiment IIA without metabolic activation, where 50 metaphases were evaluated.
The highest treatment concentration in this study, 385.0 µg/mL was chosen with regard to the solubility properties of the test item and with respect to the OECD Guideline for in vitro mammalian cytogenetic tests.
In Experiment I, visible precipitation of the test item in the culture medium was observed at 3.0 µg/mL and above in the absence and presence of S9 mix. In addition, precipitation occurred in Experiment IIA, in the absence of S9 mix, at 24.1 µg/mL and above and in Experiment IIB in the presence of S9 mix at 40.0 µg/mL and above. No relevant influence on osmolarity or pH value was observed.
In Experiment I in the absence of S9 mix no cytotoxicity was observed up to the highest applied concentration. In Experiment I in the presence of S9 mix concentrations showing clear cytotoxicity were not scorable for cytogenetic damage due to the absence of metaphases and severe test item precipitation on the slides. In Experiment IIA in the absence of S9 mix no cytotoxicity was observed up to the highest evaluable concentration. However, higher concentrations were not evaluable due to severe test item precipitation on the slides. In Experiment IIB in the presence of S9 mix cytotoxicity indicated as reduced cell numbers was observed at the highest evaluated concentration (52.5 % of control).
In the absence and presence of S9 mix, no biologically relevant increase in the number of cells carrying structural chromosome aberrations was observed. The aberration rates of the cells after treatment with the test item (0.5 - 4.0 % aberrant cells, excluding gaps) were slightly above the range of the solvent control values (1.0 - 2.0 % aberrant cells, excluding gaps) and within the range of the laboratory historical solvent control data.
No evidence of an increase in polyploid metaphases was noticed after treatment with the test item as compared to the control cultures.
In both experiments, either EMS (600.0 or 1000.0 µg/mL) or CPA (1.4 µg/mL) were used as positive controls and showed distinct increases in cells with structural chromosome aberrations.
In conclusion, it can be stated that under the experimental conditions reported, the test item did not induce structural chromosomal aberrations in V79 cells of the Chinese hamster in vitro, when tested up to precipitating and cytotoxic concentrations. - Conclusions:
- Interpretation of results:
negative
In conclusion, it can be stated that under the experimental conditions reported, the test item did not induce structural chromosome aberrations in V79 cells (Chinese hamster cell line) in vitro.
Therefore, the test item is considered to be non-clastogenic in this chromosome aberration test in the absence and presence of metabolic activation, when tested up to precipitating and cytotoxic concentrations. - Executive summary:
The test item , suspended in DMSO, was assessed for its potential to induce structural chromosome aberrations in V79 cells of the Chinese hamster in vitro in three independent experiments. The following study design was performed:
Without S9 mix
With S9 mix
Exp. I
Exp. IIA
Exp. I
Exp. IIB
Exposure period
4 hrs
18 hrs
4 hrs
4 hrs
Recovery
14 hrs
-
14 hrs
14 hrs
Preparation interval
18 hrs
18 hrs
18 hrs
18 hrs
In each experimental group two parallel cultures were set up. 100 metaphases per culture were evaluated for structural chromosome aberrations, except for the positive control in Experiment II without metabolic activation, where 50 metaphases were evaluated.
The highest applied concentration (385.0 µg/mL) was chosen with regard to the solubility properties of the test item and with respect to the current OECD Guideline 473.
Dose selection for the cytogenetic experiments was performed considering the toxicity data and the occurrence of precipitation.
In Experiment I in the absence of S9 mix no cytotoxicity was observed up to the highest applied concentration. In Experiment I in the presence of S9 mix concentrations showing clear cytotoxicity were not scorable for cytogenetic damage due to the absence of metaphases and severe test item precipitation on the slides. In Experiment IIA in the absence of S9 mix no cytotoxicity was observed up to the highest evaluable concentration. However, higher concentrations were not evaluable due to severe test item precipitation on the slides. In Experiment IIB in the presence of S9 mix cytotoxicity indicated as reduced cell numberswas observed at the highest evaluated concentration.
In both independent experiments, neither a statistically significant nor a biologically relevant increase in the number of cells carrying structural chromosomal aberrations was observed after treatment with the test item.
No evidence of an increase in polyploid metaphases was noticed after treatment with the test item as compared to the control cultures.
Appropriate mutagens were used as positive controls. They induced statistically significant increases (p < 0.05) in cells with structural chromosome aberrations.
- Endpoint:
- in vitro gene mutation study in mammalian cells
- Remarks:
- Type of genotoxicity: gene mutation
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- From 22 SEP 2011 to 12 DEC 2011
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Guideline study (OECD 476) and in compliance with GLP.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 476 (In Vitro Mammalian Cell Gene Mutation Test)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.17 (Mutagenicity - In Vitro Mammalian Cell Gene Mutation Test)
- Deviations:
- no
- GLP compliance:
- yes
- Type of assay:
- mammalian cell gene mutation assay
- Target gene:
- HPRT
- Species / strain / cell type:
- Chinese hamster lung fibroblasts (V79)
- Details on mammalian cell type (if applicable):
- - Type and identity of media: MEM
- Periodically checked for Mycoplasma contamination: yes
- Periodically checked for karyotype stability: yes
- Periodically "cleansed" against high spontaneous background: yes - Metabolic activation:
- with and without
- Metabolic activation system:
- Phenobarbital/Beta-Naphtoflavone induced Rat liver S9
- Test concentrations with justification for top dose:
- Experiment I
4 hours treatment without S9 mix: 2.7, 5.3, 10.6, 21.3 (P), 42.5 (P), 680.0 (P) µg/mL
4 hours treatment with S9 mix: 2.7, 5.3, 10.6, 21.3 (P), 42.5 (P), 680.0 (P) µg/mL
Experiment II
24 hours treatment: 2.7, 5.3, 10.6, 21.3 (P), 42.5 (P), 680.0 (P) µg/mL
4 hours treatment: 2.7, 5.3, 10.6, 21.3 (P), 42.5 (P), 680.0 (P) µg/mL
P = precipitation
In experiment I and II the concentration of 42.5 µg/mL with and without metabolic activation was not continued to avoid analysis of too many precipitating concentrations. - Vehicle / solvent:
- DMSO
- Untreated negative controls:
- no
- Negative solvent / vehicle controls:
- yes
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- ethylmethanesulphonate
- Remarks:
- without metabolic activation
- Untreated negative controls:
- no
- Negative solvent / vehicle controls:
- yes
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- 7,12-dimethylbenzanthracene
- Remarks:
- with metabolic activation
- Details on test system and experimental conditions:
- METHOD OF APPLICATION: in medium
DURATION
- Exposure duration: Experiment I: 4 hours with and without metabolic activation, Experiment II: 24 hours without metabolic activation, 4 hours with metabolic activation
- Expression time (cells in growth medium): 72 hours
- Selection time (if incubation with a selection agent): 10 days
SELECTION AGENT (mutation assays): 6-Thioguanine
NUMBER OF REPLICATIONS: 2
NUMBER OF CELLS EVALUATED: >1,5x10exp. 6
DETERMINATION OF CYTOTOXICITY
- Method: cloning efficiency - Evaluation criteria:
- A test item producing neither a concentration-related increase of the mutant frequency nor a reproducible positive response at any of the test points is considered to be non-mutagenic in this system.
A mutagenic response is described as follows:
The test item is classified as mutagenic if it induces reproducibly with one of the concen¬trations a mutation frequency that is three times higher than the spontaneous mutation fre¬quency in the experiment.
The test item is classified as mutagenic if there is a reproducible concentration-related increase of the mutation frequency. Such evaluation may be considered also in the case that a threefold increase of the mutant frequency is not observed.
In a case by case evaluation this decision depends on the level of the correspon¬ding solvent control data. - Statistics:
- A linear regression (least squares) was performed to assess a possible dose dependent increase of mutant frequencies. The number of mutant colonies obtained for the groups treated with the test item was compared to the solvent control groups. A trend is judged as significant whenever the p-value (probability value) is below 0.05. However, both, biological relevance and statistical significance were considered together.
- Key result
- Species / strain:
- Chinese hamster lung fibroblasts (V79)
- Metabolic activation:
- with and without
- Genotoxicity:
- negative
- Cytotoxicity / choice of top concentrations:
- no cytotoxicity, but tested up to precipitating concentrations
- Vehicle controls validity:
- valid
- Untreated negative controls validity:
- not applicable
- Positive controls validity:
- valid
- Additional information on results:
- TEST-SPECIFIC CONFOUNDING FACTORS
- Effects of pH: Not effected
- Effects of osmolality: The osmolarity was generally above physiological values but that effect is based on a final concentration of 1% DMSO
interfering with the freezing point depression technique used to measure osmolarity.
- Evaporation from medium: Not examined
- Water solubility: Not indicated by the sponsor
- Precipitation:
Pre-experiment: Precipitation occurred at 21.3 µg/mL and above in the presence (4 hours treatment) and absence of metabolic activation (4 and 24 hours treatment).
Main experiments: Precipitation at the end of treatment, visible to the unaided eye occurred in the first and the second experiment at 21.3 µg/mL and above with and without metabolic activation.
- Other confounding effects: None
RANGE-FINDING/SCREENING STUDIES:
The highest concentration used in the pre-test was 680 µg/mL limited by the solubility of the test item in DMSO and aqueous medium. Test item concentrations between 5.3 µg/mL and 680 µg/mL were used to evaluate toxicity in the presence (4 hours treatment) and absence (4 hours and 24 hours treatment) of metabolic activation. No relevant cytotoxic effects indicated by a relative suspension growth below 50 % were observed up to the maximum concentration with and without metabolic activation following 4 and 24 hours treatment.
The test medium was checked for precipitation or phase separation at the end of each treatment period (4 or 24 hours) prior to removal to the test item. Precipitation occurred at 21.3 µg/mL and above in the presence (4 hours treatment) and absence of metabolic activation (4 and 24 hours treatment).
There was no relevant shift of pH and osmolarity of the medium even at the maximum concentration of the test item. The osmolarity was generally above physiological values but that effect is based on a final concentration of 1% DMSO interfering with the freezing point depression technique used to measure osmolarity.
Based on the results of the pre-experiment, the individual concentrations of the main experiments were selected. The individual concentrations were generally spaced by a factor of 2 except between the two highest concentrations. A larger spacing was used to go from the lower precipitating range to the maximum possible concentration showing heavy preciptitation.
COMPARISON WITH HISTORICAL CONTROL DATA: Complies
ADDITIONAL INFORMATION ON CYTOTOXICITY: None - Conclusions:
- Interpretation of results:
negative
Conclusion:
In conclusion it can be stated that under the experimental conditions reported the test item did not induce gene mutations at the HPRT locus in V79 cells. Therefore, the test item is considered to be non-mutagenic in this HPRT assay. - Executive summary:
The test item was assessed for its potential to induce gene mutations at the HPRT locus using V79 cells of the Chinese hamster.
The assay was performed in two independent experiments, using two parallel cultures each. The first main experiment was performed with and without liver microsomal activation and a treatment period of 4 hours. The second experiment was performed with a treatment time of 4 hours with and 24 hours without metabolic activation.
The maximum concentration of the main experiments was limited by the solubility of the test item. Precipitation at the end of treatment, visible to the unaided eye occurred in the first and the second experiment at 21.3 µg/mL and above with and without metabolic activation.
No relevant cytotoxic effects, indicated by a relative cloning efficiency I (survival) of less than 50% compared to the corresponding solvent control occurred up to the maximum concentration with and without metabolic activation following 4 and 24 hours treatment.
No relevant and reproducible increase in mutant colony numbers/106cells was observed in the main experiments up to the maximum concentration. The mutant frequency remained well within the historical range of solvent controls. An increase of the induction factor exceeding the threshold of three times the mutation frequency of the corresponding solvent control was observed in the second culture of the second experiment with metabolic activation at the lowest concentrations of 2.7 and 5.3 µg/mL. However, this increase was based on a rather low mutation frequency of the solvent control of just 3.4 colonies per 106cells. Furthermore, the effect was not reproduced in the parallel culture under identical experimental conditions. Therefore, the increase of the induction factor was judged as biologically irrelevant fluctuation.
A linear regression analysis (least squares) was performed to assess a possible dose dependent increase of the mutation frequency. No significant dose dependent trend of the mutation frequency indicated by a probability value of <0.05 was determined in any of the experimental groups.
In both experiments of this study (with and without S9 mix) the range of the solvent controls was from 3.4 up to 18.5 mutants per 106cells; the range of the groups treated with the test item was from 4.3 up to 23.4 mutants per 106cells.
EMS (150 µg/mL) and DMBA (1.1 µg/mL) were used as positive controls and showed a distinct increase in induced mutant colonies.
Referenceopen allclose all
The test item showed no mutagenic activity in both experiments (plate incorporation assay without metabolic activation and preincubation assay with metabolic activation).
Summary of results of the chromosome aberration study
Exp. |
Preparation |
Test item |
Cell numbers |
Mitotic indices |
Aberrant cells |
|
|||
|
interval |
concentration |
in % |
in % |
in % |
|
|||
|
|
in µg/mL |
of control |
of control |
incl. gaps* |
excl. gaps* |
with exchanges |
|
|
|
Exposure period 4 hrs without S9 mix |
||||||||
I |
18 hrs |
Solvent control1 |
100.0 |
100.0 |
2.5 |
2.0 |
0.5 |
|
|
|
|
Positive control2 |
n.d. |
92.2 |
24.0 |
24.0S |
11.0 |
|
|
|
|
1.5 |
105.2 |
84.9 |
4.0 |
3.0 |
0.0 |
|
|
|
|
3.0P |
105.9 |
116.1 |
4.0 |
4.0 |
0.0 |
|
|
|
|
6.0P |
99.7 |
117.9 |
2.0 |
1.5 |
0.0 |
|
|
|
Exposure period 18 hrs without S9 mix |
||||||||
IIA |
18 hrs |
Solvent control1 |
100.0 |
100.0 |
1.0 |
1.0 |
0.0 |
|
|
|
|
Positive control#3 |
n.d. |
69.6 |
44.0 |
43.0S |
18.0 |
|
|
|
|
12.0 |
87.5 |
100.7 |
2.0 |
1.5 |
0.0 |
|
|
|
|
24.1P |
102.0 |
74.4 |
4.0 |
2.5 |
0.0 |
|
|
|
|
48.1P |
76.1 |
78.5 |
1.5 |
1.5 |
0.0 |
|
|
|
Exposure period 4 hrs with S9 mix |
||||||||
I |
18 hrs |
Solvent control1 |
100.0 |
100.0 |
2.0 |
2.0 |
0.0 |
|
|
|
|
Positive control4 |
n.d. |
56.7 |
23.0 |
22.0S |
4.5 |
|
|
|
|
1.5 |
94.2 |
95.0 |
4.0 |
4.0 |
1.5 |
|
|
|
|
3.0P |
101.9 |
94.3 |
2.0 |
2.0 |
1.0 |
|
|
|
|
24.1P |
95.8 |
74.1 |
3.0 |
3.0 |
1.0 |
|
|
IIB |
18 hrs |
Solvent control1 |
100 |
100 |
2.5 |
2.0 |
0.5 |
|
|
|
|
Positive control4 |
n.d. |
85.3 |
22.5 |
21.5S |
7.0 |
|
|
|
|
30.0 |
63.1 |
109.8 |
1.0 |
0.5 |
0.5 |
|
|
|
|
40.0P |
87.2 |
102.5 |
1.0 |
1.0 |
0.0 |
|
|
|
|
50.0P |
52.5 |
103.9 |
1.0 |
1.0 |
0.0 |
|
|
* Including cells carrying exchanges
# Evaluation of 50 metaphases per culture
n.d. Not determined
P Precipitation occurred at the end of treatment
S Aberration frequency statistically significant higher than corresponding control values
1 DMSO 0.5% (v/v)
2 EMS 1000.0 µg/mL
3 EMS 600.0 µg/mL
4 CPA 1.4 µg/mL
Summary Table
relative | relative | relative | mutant | relative | relative | relative | mutant | ||||||
conc. | P | S9 | cloning | cell | cloning | colonies/ | induction | cloning | cell | cloning | colonies/ | induction | |
µg/mL | mix | efficiency I | density | efficiency II | 106cells | factor | efficiency I | density | efficiency II | 106cells | factor | ||
% | % | % | % | % | % | ||||||||
Column | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
Experiment I / 4 h treatment | culture I | culture II | |||||||||||
Solvent control DMSO | - | 100.0 | 100.0 | 100.0 | 10.8 | 1.0 | 100.0 | 100.0 | 100.0 | 16.2 | 1.0 | ||
Positive control (EMS) | 150.0 | - | 77.9 | 81.2 | 95.2 | 142.4 | 13.2 | 91.0 | 96.6 | 95.5 | 97.8 | 6.0 | |
Test item | 2.7 | - | 102.0 | 81.3 | 107.5 | 13.1 | 1.2 | 101.9 | 103.2 | 107.7 | 17.4 | 1.1 | |
Test item | 5.3 | - | 100.6 | 69.6 | 96.1 | 16.3 | 1.5 | 93.7 | 110.7 | 105.3 | 13.5 | 0.8 | |
Test item | 10.6 | - | 96.8 | 81.5 | 96.4 | 19.2 | 1.8 | 96.6 | 117.3 | 104.1 | 19.9 | 1.2 | |
Test item | 21.3 | P | - | 99.9 | 101.7 | 98.7 | 13.4 | 1.2 | 93.9 | 116.2 | 101.4 | 22.3 | 1.4 |
Test item | 42.5 | P | - | 93.8 | culture was not continued# | 87.0 | culture was not continued# | ||||||
Test item | 680.0 | P | - | 87.2 | 84.2 | 95.9 | 19.3 | 1.8 | 95.1 | 113.2 | 103.4 | 11.4 | 0.7 |
Solvent control DMSO | + | 100.0 | 100.0 | 100.0 | 12.3 | 1.0 | 100.0 | 100.0 | 100.0 | 18.5 | 1.0 | ||
Positive control (DMBA) | 1.1 | + | 65.1 | 60.5 | 58.0 | 648.5 | 52.8 | 88.1 | 75.0 | 77.9 | 335.3 | 18.1 | |
Test item | 2.7 | + | 85.2 | 82.7 | 86.1 | 11.6 | 0.9 | 101.9 | 88.6 | 95.4 | 18.5 | 1.0 | |
Test item | 5.3 | + | 99.2 | 95.0 | 85.5 | 23.4 | 1.9 | 108.9 | 110.3 | 98.0 | 12.9 | 0.7 | |
Test item | 10.6 | + | 98.2 | 83.0 | 100.0 | 17.4 | 1.4 | 97.4 | 86.6 | 90.7 | 7.7 | 0.4 | |
Test item | 21.3 | P | + | 106.4 | 84.4 | 82.7 | 20.8 | 1.7 | 97.1 | 75.9 | 85.8 | 13.0 | 0.7 |
Test item | 42.5 | P | + | 104.0 | culture was not continued# | 97.2 | culture was not continued# | ||||||
Test item | 680.0 | P | + | 105.1 | 80.3 | 73.8 | 24.5 | 2.0 | 105.3 | 90.5 | 92.3 | 13.1 | 0.7 |
Experiment II / 24 h treatment | culture I | culture II | |||||||||||
Solvent control DMSO | - | 100.0 | 100.0 | 100.0 | 11.4 | 1.0 | 100.0 | 100.0 | 100.0 | 10.7 | 1.0 | ||
Positive control (EMS) | 150.0 | - | 100.1 | 124.7 | 86.4 | 390.5 | 34.2 | 98.4 | 70.4 | 91.9 | 462.9 | 43.3 | |
Test item | 2.7 | - | 96.4 | 118.1 | 125.5 | 10.2 | 0.9 | 97.8 | 85.7 | 93.2 | 20.8 | 1.9 | |
Test item | 5.3 | - | 86.1 | 113.6 | 91.1 | 19.6 | 1.7 | 95.0 | 86.3 | 114.2 | 13.7 | 1.3 | |
Test item | 10.6 | - | 85.7 | 106.0 | 122.5 | 10.2 | 0.9 | 97.0 | 89.8 | 115.3 | 22.3 | 2.1 | |
Test item | 21.3 | P | - | 74.7 | 106.2 | 116.4 | 14.3 | 1.3 | 86.3 | 89.0 | 93.3 | 7.9 | 0.7 |
Test item | 42.5 | P | - | culture was not continued# | 86.8 | culture was not continued# | |||||||
Test item | 680.0 | P | - | 86.5 | 120.5 | 74.3 | 17.7 | 1.6 | 89.7 | 99.7 | 88.8 | 18.3 | 1.7 |
Experiment II / 4 h treatment | |||||||||||||
Solvent control DMSO | + | 100.0 | 100.0 | 100.0 | 13.9 | 1.0 | 100.0 | 100.0 | 100.0 | 3.4 | 1.0 | ||
Positive control (DMBA) | 1.1 | + | 60.8 | 88.8 | 102.4 | 328.4 | 23.6 | 66.5 | 84.9 | 80.0 | 414.5 | 121.6 | |
Test item | 2.7 | + | 99.3 | 87.5 | 101.8 | 9.4 | 0.7 | 96.7 | 110.7 | 84.9 | 11.1 | 3.2 | |
Test item | 5.3 | + | 91.2 | 97.1 | 110.9 | 6.2 | 0.4 | 95.3 | 106.3 | 90.6 | 13.2 | 3.9 | |
Test item | 10.6 | + | 93.7 | 98.0 | 111.4 | 9.0 | 0.6 | 102.0 | 92.0 | 91.7 | 6.3 | 1.8 | |
Test item | 21.3 | P | + | 95.7 | 116.4 | 103.3 | 10.2 | 0.7 | 99.4 | 112.5 | 91.9 | 4.3 | 1.3 |
Test item | 42.5 | P | + | 93.5 | culture was not continued# | 90.0 | culture was not continued# | ||||||
Test item | 680.0 | P | + | 82.5 | 112.4 | 107.6 | 6.6 | 0.5 | 93.0 | 113.4 | 90.3 | 4.4 | 1.3 |
# culture not continued to avoid evaluation of too many precipitating concentrations
P precipitation
Endpoint conclusion
- Endpoint conclusion:
- no adverse effect observed (negative)
Genetic toxicity in vivo
Endpoint conclusion
- Endpoint conclusion:
- no study available
Additional information
Justification for classification or non-classification
No classification
The test item did not cause genotoxic effects in vitro in bacterial or mammalian cells.
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