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EC number: 700-042-6 | CAS number: 177997-13-6
- 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
- Remarks:
- Type of genotoxicity: gene mutation
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- The experimental phase of this study was performed between 13 May 2008 and 04 June 2008.
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Study conducted to GLP and in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do no effect the quality of the relevant results.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 008
- Report date:
- 2008
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 471 (Bacterial Reverse Mutation Assay)
- Deviations:
- no
- Principles of method if other than guideline:
- Not applicable.
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- UK GLP standards (Schedule 1, Good Laboratory Practice Regulations 1999 (SI 1999/3106 as amended by SI 2004/0994)).
- Type of assay:
- bacterial reverse mutation assay
Test material
- Reference substance name:
- aluminium(3+) nickel(2+) λ²-cobalt(2+) lithium(1+) tetraoxidandiide
- EC Number:
- 700-042-6
- Cas Number:
- 177997-13-6
- Molecular formula:
- LiNiCoAlO2 where stoichiometry of Ni+Co+Al equals 1 and ranges are Li = 0.9 – 1.3, Co = 0.01 – 0.2, Ni = 0.75 – 0.99 and Al = 0.01 – 0.2
- IUPAC Name:
- aluminium(3+) nickel(2+) λ²-cobalt(2+) lithium(1+) tetraoxidandiide
Constituent 1
Method
- Target gene:
- Histidine for Salmonella
Trytptophan for E Coli
Species / strainopen allclose all
- Species / strain / cell type:
- S. typhimurium TA 1535, TA 1537, TA 98 and TA 100
- Details on mammalian cell type (if applicable):
- Not applicable.
- Additional strain / cell type characteristics:
- not applicable
- Species / strain / cell type:
- E. coli WP2 uvr A
- Details on mammalian cell type (if applicable):
- Not applicable.
- Additional strain / cell type characteristics:
- not applicable
- Metabolic activation:
- with and without
- Metabolic activation system:
- phenobarbitone/betanaphthoflavone induced rat liver, S9
- Test concentrations with justification for top dose:
- Preliminary Toxicity Test: 0, 0.15, 0.5, 1.5, 5, 15, 50, 150, 500, 1500 and 5000 µg/plate.
Main test (Experiments 1 and 2): 50, 150, 500, 1500 and 5000 µg/plate - Vehicle / solvent:
- - Vehicle(s)/solvent(s) used: dimethyl sulphoxide
- Justification for choice of solvent/vehicle: The test material was insoluble in sterile distilled water according to information provided by the sponsor. In solubility checks performed in-house, the test material was found to be insoluble in dimethyl sulphoxide, acetone, dimethyl formamide and acetonitrile at 50 mg/ml and tetrahydrofuran at 200 mg/ml. The best doseable suspension was achieved in dimethyl sulphoxide, therefore, this solvent was selected as the vehicle.
Controlsopen allclose all
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous mutation rates
- Negative solvent / vehicle controls:
- yes
- Remarks:
- Dimethyl sulphoxide
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- N-ethyl-N-nitro-N-nitrosoguanidine
- Remarks:
- without S9 mix Migrated to IUCLID6: (ENNG)
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous mutation rates
- Negative solvent / vehicle controls:
- yes
- Remarks:
- Dimethyl sulphoxide
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- 4-nitroquinoline-N-oxide
- Remarks:
- without S9 mix Migrated to IUCLID6: (4NQO)
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous mutation rates
- Negative solvent / vehicle controls:
- yes
- Remarks:
- Dimethyl sulphoxide
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- 9-aminoacridine
- Remarks:
- without S9 mix Migrated to IUCLID6: (9AA)
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous mutation rates
- Negative solvent / vehicle controls:
- yes
- Remarks:
- Dimethyl sulphoxide
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- benzo(a)pyrene
- Remarks:
- with S9 mix Migrated to IUCLID6: (BP)
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous mutation rates
- Negative solvent / vehicle controls:
- yes
- Remarks:
- Dimethyl sulphoxide
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- other: 2-Aminoanthracene (2AA)
- Remarks:
- with S9 mix
- Details on test system and experimental conditions:
- METHOD OF APPLICATION: in medium; in agar (plate incorporation)
DURATION
- Preincubation period: 10 hours
- Exposure duration: 48 - 72 hours
- Expression time (cells in growth medium): Not applicable
- Selection time (if incubation with a selection agent): Not applicable
- Fixation time (start of exposure up to fixation or harvest of cells): 48 - 72 hours
SELECTION AGENT (mutation assays): Not applicable.
NUMBER OF REPLICATIONS: Triplicate plating.
NUMBER OF CELLS EVALUATED: Not applicable.
DETERMINATION OF CYTOTOXICITY
- Method: plates were assessed for numbers of revertant colonies using a Domino colony counter and examined for effects on the growth of the bacterial background lawn.
OTHER EXAMINATIONS: None
- Evaluation criteria:
- Acceptance Criteria:
The reverse mutation assay may be considered valid if the following criteria are met:
All tester strain cultures exhibit a characteristic number of spontaneous revertants per plate in the vehicle and untreated controls.
The appropriate characteristics for each tester strain have been confirmed, eg rfa cell-wall mutation and pKM101 plasmid R-factor etc.
All tester strain cultures should be in the approximate range of 1 to 9.9 x 109 bacteria per ml.
Each mean positive control value should be at least twice the respective vehicle control value for each strain, thus demonstrating both the intrinsic sensitivity of the tester strains to mutagenic exposure and the integrity of the S9-mix.
There should be a minimum of four non-toxic test material dose levels.
There should be no evidence of excessive contamination.
Evaluation Criteria:
There are several criteria for determining a positive result, such as a dose-related increase in revertant frequency over the dose range tested and/or a reproducible increase at one or more concentrations in at least one bacterial strain with or without metabolic activation. Biological relevance of the results will be considered first, statistical methods, as recommended by the UKEMS can also be used as an aid to evaluation, however, statistical significance will not be the only determining factor for a positive response.
A test material will be considered non-mutagenic (negative) in the test system if the above criteria are not met.
Although most experiments will give clear positive or negative results, in some instances the data generated will prohibit a definitive judgement about the test material activity. Results of this type will be reported as equivocal. - Statistics:
- Standard deviation.
Results and discussion
Test resultsopen allclose all
- 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 nor precipitates, but tested up to recommended limit concentrations
- Remarks:
- tested up to the maximum recommended dose level of 5000 µg/plate.
- 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 nor precipitates, but tested up to recommended limit concentrations
- Remarks:
- tested up to the maximum recommended dose level of 5000 µg/plate.
- Vehicle controls validity:
- valid
- Untreated negative controls validity:
- valid
- Positive controls validity:
- valid
- Additional information on results:
- TEST-SPECIFIC CONFOUNDING FACTORS
- Water solubility: The test material was insoluble in sterile distilled water.
- Precipitation: A dark, particulate precipitate was observed under an inverted microscope at 5000 µg/plate, this did not prevent the scoring of revertant colonies.
- Other confounding effects: None.
RANGE-FINDING/SCREENING STUDIES:
Preliminary Toxicity Test:
The test material was non-toxic to the strains of bacteria used (TA100 and WP2uvrA-). The test material formulation and S9-mix used in this experiment were both shown to be sterile.
COMPARISON WITH HISTORICAL CONTROL DATA:
Prior to use, the master strains were checked for characteristics, viability and spontaneous reversion rate (all were found to be satisfactory). These data are not given in the report. The amino acid supplemented top agar and the S9-mix used in both experiments was shown to be sterile.
Results for the negative controls (spontaneous mutation rates) were considered to be acceptable. These data are for concurrent untreated control plates performed on the same day as the Mutation Test.
ADDITIONAL INFORMATION ON CYTOTOXICITY: none. - Remarks on result:
- other: all strains/cell types tested
- Remarks:
- Migrated from field 'Test system'.
Any other information on results incl. tables
Results for the negative controls (spontaneous mutation rates) are presented in Table 1and were considered to be acceptable. These data are for concurrent untreated control plates performed on the same day as the Mutation Test.
The individual plate counts, the mean number of revertant colonies and the standard deviations, for the test material, positive and vehicle controls, both with and without metabolic activation, are presented in Table 2 and Table 3 for Experiment 1 and Table 4 and Table 5 for Experiment 2.
The test material caused no visible reduction in the growth of the bacterial background lawn at any dose level and was, therefore, tested up to the maximum recommended dose level of 5000 µg/plate. A dark, particulate precipitate was observed under an inverted microscope at 5000 µg/plate, this did not prevent the scoring of revertant colonies.
No significant increases in the frequency of revertant colonies were recorded for any of the strains of bacteria, at any dose level either with or without metabolic activation.
All of the positive control chemicals used in the test induced marked increases in the frequency of revertant colonies thus confirming the activity of the S9-mix and the sensitivity of the bacterial strains.
Table 1 Spontaneous Mutation Rates (Concurrent Negative Controls)
EXPERIMENT 1
Number of revertants (mean number of colonies per plate) |
|||||||||
Base-pair substitution type |
Frameshift type |
||||||||
TA100 |
TA1535 |
WP2uvrA- |
TA98 |
TA1537 |
|||||
128 |
|
25 |
|
40 |
|
19 |
|
15 |
|
129 |
(132) |
25 |
(23) |
35 |
(41) |
19 |
(20) |
14 |
(15) |
140 |
|
19 |
|
47 |
|
22 |
|
15 |
|
EXPERIMENT 2
Number of revertants (mean number of colonies per plate) |
|||||||||
Base-pair substitution type |
Frameshift type |
||||||||
TA100 |
TA1535 |
WP2uvrA- |
TA98 |
TA1537 |
|||||
123 |
|
13 |
|
23 |
|
17 |
|
20 |
|
113 |
(120) |
17 |
(15) |
35 |
(31) |
23 |
(23) |
17 |
(19) |
124 |
|
16 |
|
34 |
|
30 |
|
21 |
|
Table 2 Test Results: Experiment 1 – Without Metabolic Activation
Test Period |
From: 24 May 2008 |
To: 27 May 2008 |
||||||||||
With or without S9-Mix |
Test substance concentration (µg/plate) |
Number of revertants (mean number of colonies per plate) |
||||||||||
Base-pair substitution type |
Frameshift type |
|||||||||||
TA100 |
TA1535 |
WP2uvrA‑ |
TA98 |
TA1537 |
||||||||
- |
0 |
108 115 129 |
(117) 10.7# |
27 26 26 |
(26) 0.6 |
24 25 30 |
(26) 3.2 |
15 18 22 |
(18) 3.5 |
8 10 10 |
(9) 1.2 |
|
- |
50 |
134 126 130 |
(130) 4.0 |
27 30 34 |
(30) 3.5 |
29 29 29 |
(29) 0.0 |
14 20 22 |
(19) 4.2 |
13 13 8 |
(11) 2.9 |
|
- |
150 |
118 118 132 |
(123) 8.1 |
40 23 22 |
(28) 10.1 |
26 27 27 |
(27) 0.6 |
12 10 12 |
(11) 1.2 |
10 10 10 |
(10) 0.0 |
|
- |
500 |
117 103 117 |
(112) 8.1 |
29 21 21 |
(24) 4.6 |
29 27 31 |
(29) 2.0 |
16 12 12 |
(13) 2.3 |
16 16 8 |
(13) 4.6 |
|
- |
1500 |
128 139 125 |
(131) 7.4 |
40 25 20 |
(28) 10.4 |
26 26 32 |
(28) 3.5 |
23 9 16 |
(16) 7.0 |
11 10 10 |
(10) 0.6 |
|
- |
5000 |
130 140 120 |
(130) 10.0 |
16 22 31 |
(23) 7.5 |
22 35 33 |
(30) 7.0 |
18 12 19 |
(16) 3.8 |
10 12 11 |
(11) 1.0 |
|
Positive controls
S9-Mix
- |
Name Concentration (μg/plate) No. colonies per plate |
ENNG |
ENNG |
ENNG |
4NQO |
9AA |
||||||
3 |
5 |
2 |
0.2 |
80 |
||||||||
1513 1127 1049 |
(1230) 248.5 |
114 119 120 |
(118) 3.2 |
651 660 647 |
(653) 6.7 |
115 115 114 |
(115) 0.6 |
2572 2606 2770 |
(2649) 105.9 |
ENNG N-ethyl-N'-nitro-N-nitrosoguanidine
4NQO 4-Nitroquinoline-1-oxide
9AA 9-Aminoacridine
# Standard deviation
Table 3 Test Results: Experiment 1 – With Metabolic Activation
Test Period |
From: 24 May 2008 |
To: 27 May 2008 |
||||||||||
With or without S9-Mix |
Test substance concentration (µg/plate) |
Number of revertants (mean number of colonies per plate) |
||||||||||
Base-pair substitution type |
Frameshift type |
|||||||||||
TA100 |
TA1535 |
WP2uvrA‑ |
TA98 |
TA1537 |
||||||||
+ |
0 |
114 85 93 |
(97) 15.0# |
15 18 19 |
(17) 2.1 |
40 21 35 |
(32) 9.8 |
21 27 10 |
(19) 8.6 |
22 14 20 |
(19) 4.2 |
|
+ |
50 |
91 93 99 |
(94) 4.2 |
16 16 21 |
(18) 2.9 |
41 25 26 |
(31) 9.0 |
36 22 15 |
(24) 10.7 |
23 15 8 |
(15) 7.5 |
|
+ |
150 |
86 101 112 |
(100) 13.1 |
18 15 15 |
(16) 1.7 |
33 34 34 |
(34) 0.6 |
19 19 21 |
(20) 1.2 |
15 23 16 |
(18) 4.4 |
|
+ |
500 |
102 100 80 |
(94) 12.2 |
14 12 10 |
(12) 2.0 |
35 34 33 |
(34) 1.0 |
10 24 20 |
(18) 7.2 |
27 16 14 |
(19) 7.0 |
|
+ |
1500 |
81 85 91 |
(86) 5.0 |
11 12 13 |
(12) 1.0 |
34 24 29 |
(29) 5.0 |
14 24 23 |
(20) 5.5 |
12 19 20 |
(17) 4.4 |
|
+ |
5000 |
91 93 92 |
(92) 1.0 |
19 9 15 |
(14) 5.0 |
29 34 26 |
(30) 4.0 |
23 19 21 |
(21) 2.0 |
22 13 10 |
(15) 6.2 |
|
Positive controls
S9-Mix
+ |
Name Concentration (μg/plate) No. colonies per plate |
2AA |
2AA |
2AA |
BP |
2AA |
||||||
1 |
2 |
10 |
5 |
2 |
||||||||
2370 2221 2043 |
(2211) 163.7 |
319 354 307 |
(327) 24.4 |
443 514 510 |
(489) 39.9 |
126 151 114 |
(130) 18.9 |
207 158 206 |
(190) 28.0 |
2AA 2-Aminoanthracene
BP Benzo(a)pyrene
# Standard deviation
Table 4 Test Results: Experiment 2 – Without Metabolic Activation
Test Period |
From: 01 June 2008 |
To: 04 June 2008 |
||||||||||
With or without S9-Mix |
Test substance concentration (µg/plate) |
Number of revertants (mean number of colonies per plate) |
||||||||||
Base-pair substitution type |
Frameshift type |
|||||||||||
TA100 |
TA1535 |
WP2uvrA‑ |
TA98 |
TA1537 |
||||||||
- |
0 |
106 80 93 |
(93) 13.0# |
17 10 17 |
(15) 4.0 |
43 34 35 |
(37) 4.9 |
18 21 34 |
(24) 8.5 |
18 17 22 |
(19) 2.6 |
|
- |
50 |
91 101 86 |
(93) 7.6 |
23 16 14 |
(18) 4.7 |
41 31 36 |
(36) 5.0 |
25 27 27 |
(26) 1.2 |
21 22 21 |
(21) 0.6 |
|
- |
150 |
93 111 104 |
(103) 9.1 |
15 13 20 |
(16) 3.6 |
41 39 39 |
(40) 1.2 |
16 28 23 |
(22) 6.0 |
16 19 21 |
(19) 2.5 |
|
- |
500 |
110 107 108 |
(108) 1.5 |
15 10 18 |
(14) 4.0 |
43 43 42 |
(43) 0.6 |
17 23 23 |
(21) 3.5 |
17 19 20 |
(19) 1.5 |
|
- |
1500 |
94 117 108 |
(106) 11.6 |
15 10 10 |
(12) 2.9 |
33 29 37 |
(33) 4.0 |
34 22 21 |
(26) 7.2 |
18 23 14 |
(18) 4.5 |
|
- |
5000 |
100 118 112 |
(110) 9.2 |
11 9 15 |
(12) 3.1 |
44 28 35 |
(36) 8.0 |
28 30 21 |
(26) 4.7 |
22 21 15 |
(19) 3.8 |
|
Positive controls
S9-Mix
- |
Name Concentration (μg/plate) No. colonies per plate |
ENNG |
ENNG |
ENNG |
4NQO |
9AA |
||||||
3 |
5 |
2 |
0.2 |
80 |
||||||||
416 586 568 |
(523) 93.4 |
85 147 138 |
(123) 33.5 |
758 762 745 |
(755) 8.9 |
167 146 141 |
(151) 13.8 |
2028 2103 1603 |
(1911) 269.6 |
ENNG N-ethyl-N'-nitro-N-nitrosoguanidine
4NQO 4-Nitroquinoline-1-oxide
9AA 9-Aminoacridine
# Standard deviation
Table 5 Test Results: Experiment 2 – With Metabolic Activation
Test Period |
From: 01 June 2008 |
To: 04 June 2008 |
||||||||||
With or without S9-Mix |
Test substance concentration (µg/plate) |
Number of revertants (mean number of colonies per plate) |
||||||||||
Base-pair substitution type |
Frameshift type |
|||||||||||
TA100 |
TA1535 |
WP2uvrA‑ |
TA98 |
TA1537 |
||||||||
+ |
0 |
93 102 175 |
(123) 45.0# |
14 10 14 |
(13) 2.3 |
29 26 31 |
(29) 2.5 |
14 19 26 |
(20) 6.0 |
15 13 21 |
(16) 4.2 |
|
+ |
50 |
109 98 108 |
(105) 6.1 |
9 9 9 |
(9) 0.0 |
21 23 23 |
(22) 1.2 |
18 27 21 |
(22) 4.6 |
19 25 18 |
(21) 3.8 |
|
+ |
150 |
78 72 79 |
(76) 3.8 |
11 9 9 |
(10) 1.2 |
23 23 29 |
(25) 3.5 |
20 19 25 |
(21) 3.2 |
23 13 17 |
(18) 5.0 |
|
+ |
500 |
99 68 91 |
(86) 16.1 |
9 12 12 |
(11) 1.7 |
23 22 29 |
(25) 3.8 |
20 28 23 |
(24) 4.0 |
21 17 22 |
(20) 2.6 |
|
+ |
1500 |
102 90 98 |
(97) 6.1 |
10 9 9 |
(9) 0.6 |
18 33 30 |
(27) 7.9 |
17 26 21 |
(21) 4.5 |
14 14 12 |
(13) 1.2 |
|
+ |
5000 |
92 109 122 |
(108) 15.0 |
12 10 9 |
(10) 1.5 |
20 22 23 |
(22) 1.5 |
25 34 9 |
(23) 12.7 |
13 20 16 |
(16) 3.5 |
|
Positive controls
S9-Mix
+ |
Name Concentration (μg/plate) No. colonies per plate |
2AA |
2AA |
2AA |
BP |
2AA |
||||||
1 |
2 |
10 |
5 |
2 |
||||||||
2195 2014 2025 |
(2078) 101.5 |
445 142 275 |
(287) 151.9 |
412 487 486 |
(462) 43.0 |
113 188 184 |
(162) 42.2 |
271 570 510 |
(450) 158.2 |
2AA 2-Aminoanthracene
BP Benzo(a)pyrene
# Standard deviation
Applicant's summary and conclusion
- Conclusions:
- Interpretation of results:
negative
The test material was considered to be non-mutagenic under the conditions of this test. - Executive summary:
Introduction.
The method conforms to the guidelines for bacterial mutagenicity testing published by the major Japanese Regulatory Authorities including METI, MHLW and MAFF. It also meets the requirements of the OECD Guidelines for Testing of Chemicals No. 471 "Bacterial Reverse Mutation Test", Method B13/14 of Commission Directive 2000/32/EC and the, EPA (TSCA) OPPTS harmonised guidelines.
Methods.
Salmonella typhimurium strains TA1535, TA1537, TA98, TA100 and Escherichia coli strain WP2uvrA-were treated with suspensions of the test material using the Ames plate incorporation method at five dose levels, in triplicate, both with and without the addition of a rat liver homogenate metabolising system (10% liver S9 in standard co-factors). The dose range was determined in a preliminary toxicity assay and was 50 to 5000 µg/plate in the first experiment. The experiment was repeated on a separate day using the same dose range as Experiment 1, fresh cultures of the bacterial strains and fresh test material formulations.
Results.
The vehicle (dimethyl sulphoxide) control plates gave counts of revertant colonies within the normal range. All of the positive control chemicals used in the test induced marked increases in the frequency of revertant colonies, both with or without metabolic activation. Thus, the sensitivity of the assay and the efficacy of the S9-mix were validated.
The test material caused no visible reduction in the growth of the bacterial background lawn at any dose level and was, therefore, tested up to the maximum recommended dose level of 5000 µg/plate. A dark, particulate precipitate was observed under an inverted microscope at 5000 µg/plate, this did not prevent the scoring of revertant colonies.
No significant increases in the frequency of revertant colonies were recorded for any of the bacterial strains, with any dose of the test material, either with or without metabolic activation.
Conclusion.The test material was considered to be non-mutagenic under the conditions of this test.
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