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EC number: 225-561-0 | CAS number: 4927-36-0
- 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
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:
- 03 April, 2016 - 21 April, 2016
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Title:
- Unnamed
- Year:
- 2 016
- Report date:
- 2016
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 471 (Bacterial Reverse Mutation Assay)
- Version / remarks:
- 21 July, 1997
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.13/14 (Mutagenicity - Reverse Mutation Test Using Bacteria)
- Version / remarks:
- 31 May 2008
- Deviations:
- no
- GLP compliance:
- yes
- Type of assay:
- bacterial reverse mutation assay
Test material
- Reference substance name:
- 5-methyl-5-phenylhexan-3-one
- EC Number:
- 225-561-0
- EC Name:
- 5-methyl-5-phenylhexan-3-one
- Cas Number:
- 4927-36-0
- Molecular formula:
- C13H18O
- IUPAC Name:
- 5-methyl-5-phenylhexan-3-one
- Test material form:
- liquid
Constituent 1
Method
- Target gene:
- - S. typhimurium: Histidine gene
- Escherichia coli: Tryptophan gene
Species / strain
- Species / strain / cell type:
- S. typhimurium TA 1535, TA 1537, TA 98, TA 100 and E. coli WP2
- Metabolic activation:
- with and without
- Metabolic activation system:
- Rat liver S9-mix induced by Aroclor 1254.
- Test concentrations with justification for top dose:
- Direct plate:
- Dose range finding test:
TA 100 and WP2uvrA (without and with S9): 1.7, 5.4, 17, 52, 164, 512, 1600 and 5000 μg/plate
Based on the results of experiment 1, the following dose levels were used:
- Experiment 1:
TA 1535, TA 1537 and TA 98 (without and with S9): 17, 52, 164, 512 and 1600 μg/plate
Preincubation:
- Experiment 2:
Based on the results of experiment 1, the following dose levels were used:
TA 1535, TA 1537, TA 98, TA 100 and WP2uvrA (without and with S9): 5.4, 17, 52, 164, 512 and 1600 μg/plate - Vehicle / solvent:
- - Vehicle used: Dimethyl sulfoxide (DMSO)
- Justification for choice of vehicle: A solubility test was performed. The test item was dissolved in dimethyl sulfoxide.
Controls
- Untreated negative controls:
- no
- Negative solvent / vehicle controls:
- yes
- Remarks:
- 100 μL/plate DMSO
- Positive controls:
- yes
- Positive control substance:
- other: see section "Any other information on materials and methods incl. tables"
- Details on test system and experimental conditions:
- METHOD OF APPLICATION:
- Experiment 1: in agar (plate incorporation)
- Experiment 2: (independent repeat): preincubation
DURATION
- Preincubation period: 30 minutes
- Exposure duration: 48 hours
NUMBER OF REPLICATIONS:
- Doses of the test substance were tested in triplicate in each strain (in all experiments)
DETERMINATION OF CYTOTOXICITY
- Method: on the basis of a decline in the number of spontaneous revertants, a thinning of the background lawn or a microcolony formation. - Evaluation criteria:
- A test item is considered negative (not mutagenic) in the test if:
a) The total number of revertants in tester strain TA100 or WP2uvrA is not greater than two (2) times the concurrent control, and the total number of revertants in tester strains TA1535, TA1537 or TA98 is not greater than three (3) times the concurrent control.
b) The negative response should be reproducible in at least one follow up experiment.
A test item is considered positive (mutagenic) in the test if:
a) The total number of revertants in tester strain TA100 or WP2uvrA is greater than two (2) times the concurrent control, or the total number of revertants in tester strains TA1535, TA1537 or TA98 is greater than three (3) times the concurrent 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 follow up experiment. - Statistics:
- Not performed.
Results and discussion
Test resultsopen allclose all
- Key result
- Species / strain:
- S. typhimurium TA 100
- Metabolic activation:
- with and without
- Genotoxicity:
- negative
- Cytotoxicity / choice of top concentrations:
- cytotoxicity
- Remarks:
- direct plate: at 1600 and 5000 μg/plate; pre-incubation assay: at 164, 512 and 1600 μg/plate
- Vehicle 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:
- cytotoxicity
- Remarks:
- direct plate without and with S9: at 1600 μg/plate; pre-incubation assay without and with S9: at 164, 512 and 1600 μg/plateg/plate.
- Vehicle controls validity:
- valid
- Positive controls validity:
- valid
- Key result
- Species / strain:
- S. typhimurium TA 1537
- Metabolic activation:
- with and without
- Genotoxicity:
- negative
- Cytotoxicity / choice of top concentrations:
- cytotoxicity
- Remarks:
- direct plate without and with S9: at 1600 μg/plate; pre-incubation assay without and with S9: at 164, 512 and 1600 μg/plateg/plate.
- Vehicle 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:
- cytotoxicity
- Remarks:
- direct plate without S9 only: at 1600 μg/plate; pre-incubation assay without and with S9: at 164, 512 and 1600 μg/plateg/plate.
- Vehicle 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:
- cytotoxicity
- Remarks:
- direct plate: no toxicity was observed; pre-incubation assay without S9: at 164, 512 and 1600 μg/plateg/plate, with S9: at 512 and 1600 μg/plateg/plate.
- Vehicle controls validity:
- valid
- Positive controls validity:
- valid
- Additional information on results:
- TEST-SPECIFIC CONFOUNDING FACTORS
- Precipitation:
Dose range finding test: Precipitation of the test item on the plates was observed at the start of the incubation period at the concentration of 5000 μg/plate and at 1600 and 5000 μg/plate at the end of the incubation period. The precipitation of 5000 μg/plate at the end of the incubation period was observed as small droplets of the test item.
First mutation experiment: No precipitation of Damascol/4 on the plates was observed at the start of the incubation period and the test item precipitated at the concentration of 1600 μg/plate at the end of the incubation period.
Precipitation of Damascol/4 on the plates was not observed at the start or at the end of the incubation period.
RANGE-FINDING/SCREENING STUDIES: In tester strain TA100, toxicity was observed at dose levels of 1600 μg/plate and above in the absence and presence of S9-mix. In tester strain WP2uvrA, no toxicity was observed at any of the dose levels tested.
HISTORICAL CONTROL DATA (with ranges, means and standard deviation and confidence interval (e.g. 95%)
- Positive historical control data:
TA1535 TA1537 TA98
S9-mix - + - + - +
Range 78 - 1932 81 - 1332 62 – 1565 55 – 1112 347 – 1967 261 - 1885
Mean 791 234 662 409 976 821
SD 261 98 206 126 251 298
n 1732 1737 1409 1428 1721 1737
TA100 WP2uvrA
S9-mix - + - +
Range 549 – 1798 640 - 2760 123 – 1958 85 - 1390
Mean 914 1387 1367 261
SD 150 324 276 276
n 1734 1752 1373 1404
SD = Standard deviation
n = Number of observations
Historical control data from experiments performed between November 2013 and January 2016.
- Negative (solvent/vehicle) historical control data:
TA1535 TA1537 TA98 TA100 WP2uvrA
S9-mix - + - + - + - + - +
Range 5 - 36 3 - 34 3 – 25 3 - 28 9 - 50 9 - 57 63 - 153 60 - 156 13 – 68 12 - 70
Mean 177 14 7 9 18 26 104 105 28 34
SD 6 5 3 3 6 7 17 17 7 7
n 1644 1716 1425 1443 1707 1730 1725 1739 1368 1404
SD = Standard deviation
n = Number of observations
Historical control data from experiments performed between November 2013 and January 2016.
ADDITIONAL INFORMATION ON CYTOTOXICITY:
Experiment 1: Cytotoxicity, as evidenced by a slight to extreme decrease in the number of revertants, was observed in the tester strains TA1535 and TA1537 (absence and presence of S9-mix), TA98 (absence of S9-mix) at the highest tested concentration. No toxicity was observed in tester strains TA98 in the presence of S9-mix.
Experiment 2: Cytotoxicity, as evidenced by a slight to extreme decrease in the number of revertants and/or reductions of the bacterial background lawn, was observed in all tester strains.
Applicant's summary and conclusion
- Conclusions:
- The substance is not mutagenic in the Salmonella typhimurium reverse mutation assay and Escherichia coli reverse mutation assay performed according to OECD 471 (1997) and GLP principles. Therefore, Damascol 4 does not need to be classified for mutagenicity in accordance with the criteria outlined in Annex I of the CLP regulation (1272/2008/EC).
- Executive summary:
The mutagenic activity of the substance was evaluated in accordance with OECD 471 (1997) guideline and according to GLP principles. The test was performed in two independent experiments: at first a direct plate assay was performed and secondly a pre-incubation assay, both in the absence and presence of S9-mix up to and including 1600 μg/plate. The dose levels were selected based on a dose range finding test with strain TA100 and WP2uvrA. In experiment 1, cytotoxicity, as evidenced by a slight to extreme decrease in the number of revertants, was observed in the tester strains TA1535 and TA1537 (absence and presence of S9-mix), TA98 (absence of S9-mix) at the highest tested concentration. No toxicity was observed in tester strains TA98 in the presence of S9-mix and in tester strain WP2uvrA. In the second mutation assay, cytotoxicity, as evidenced by a slight to extreme decrease in the number of revertants and/or reductions of the bacterial background lawn, was observed in all tester strains. The substance did not induce a significant dose related increase in the number of revertant (His+) colonies in each of the four S. typhimurium tester strains (TA1535, TA1537, TA98 and TA100) and E. coli tester strain (WP2uvrA), both in the absence and presence of S9 -metabolic activation. These results were confirmed in independently repeated experiments. Based on the results of this study it is concluded that the substance is not mutagenic in the Salmonella typhimurium reverse mutation assay and Escherichia coli reverse mutation assay. Therefore, Damascol 4 does not need to be classified for mutagenicity in accordance with the criteria outlined in Annex I of the CLP regulation (1272/2008/EC).
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