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EC number: 231-823-5 | CAS number: 7757-86-0
- Life Cycle description
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- Appearance / physical state / colour
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- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
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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:
- Between 22 December 2009 and 07 February 2010
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 010
- Report date:
- 2010
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 471 (Bacterial Reverse Mutation Assay)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.13/14 (Mutagenicity - Reverse Mutation Test Using Bacteria)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 870.5100 - Bacterial Reverse Mutation Test (August 1998)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- JAPAN: Guidelines for Screening Mutagenicity Testing Of Chemicals
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of assay:
- bacterial reverse mutation assay
Test material
- Reference substance name:
- Trimagnesium phosphate-4-hydrate
- IUPAC Name:
- Trimagnesium phosphate-4-hydrate
- Test material form:
- solid
Constituent 1
Method
- Target gene:
- Histidine for Salmonella.
Tryptophan 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 mix
- 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:
Experiment one: 50, 150, 500, 1500 and 5000 µg/plate
Experiment two: 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 fully soluble in sterile distilled water at 50 mg/mL in solubility checks performed in-house
Controlsopen allclose all
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous Mutation Rate for TA100
- Negative solvent / vehicle controls:
- yes
- Remarks:
- Dimethyl sulphoxide
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- other: 2-Aminoanthracene at 1 µg/plate
- Remarks:
- With S9 mix
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous mutation rate for TA100
- 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
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous mutation rate for TA1535
- Negative solvent / vehicle controls:
- yes
- Remarks:
- Dimethyl sulphoxide
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- other: 2-Aminoanthracene at 2 µg/plate
- Remarks:
- With S9 mix
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous mutation rate of TA1535
- 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
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous Mutation rate of TA1537
- Negative solvent / vehicle controls:
- yes
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- other: 2-Aminoanthracene at 2 µg/plate
- Remarks:
- with S9 mix
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous mutation rate of TA1537
- Negative solvent / vehicle controls:
- yes
- Remarks:
- Dimethyl suphoxide
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- 9-aminoacridine
- Remarks:
- without S9 mix
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous Mutation rate of TA98
- 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
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous Mutation rate of TA98
- 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
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous Mutation rate of WP2uvrA-
- Negative solvent / vehicle controls:
- yes
- Remarks:
- Dimethyl sulphoxide
- True negative controls:
- no
- Positive controls:
- yes
- Positive control substance:
- other: 2-Aminoanthracene at 10 µg/plate
- Remarks:
- with S9 mix
- Untreated negative controls:
- yes
- Remarks:
- Spontaneous Mutation rate of WP2uvrA-
- 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
- Details on test system and experimental conditions:
- METHOD OF APPLICATION: in agar (plate incorporation)
DURATION
- Preincubation period: 10h
- Exposure duration: 48 - 72 hrs
- 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 hrs
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 and examined for effects on the growth of the bacterial background lawn. - 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 not be an excessive loss of plates due to 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:
- 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
- Vehicle controls validity:
- valid
- Untreated negative controls validity:
- valid
- Positive controls validity:
- valid
- 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
- Vehicle controls validity:
- valid
- Untreated negative controls validity:
- valid
- Positive controls validity:
- valid
- Additional information on results:
- TEST-SPECIFIC CONFOUNDING FACTORS
-Dimethyl suphoxide solubility: The test material was fully soluble in sdimethyl sulphoxide at 50 mg/ml in solubility checks performed in-house.
- Precipitation: No test material precipitate was observed on the plates at any of the doses tested in either the presence or absence of S9-mix.
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).
Results for the negative controls (spontaneous mutation rates) were considered to be acceptable.
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.
ADDITIONAL INFORMATION ON CYTOTOXICITY: None
Any other information on results incl. tables
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.
The numbers of revertant colonies for the toxicity assay were:
With (+) or without (-) S9-mix |
Strain |
Dose (µg/plate) |
||||||||||
0 |
0.15 |
0.5 |
1.5 |
5 |
15 |
50 |
150 |
500 |
1500 |
5000 |
||
- |
TA100 |
122 |
115 |
116 |
128 |
115 |
106 |
119 |
104 |
107 |
100 |
110 |
+ |
TA100 |
94 |
91 |
99 |
104 |
71 |
90 |
97 |
91 |
98 |
88 |
84 |
- |
WP2uvrA- |
17 |
32 |
25 |
16 |
28 |
32 |
25 |
18 |
19 |
27 |
29 |
+ |
WP2uvrA- |
30 |
33 |
24 |
28 |
31 |
27 |
22 |
32 |
29 |
24 |
32 |
In the range-finding test (Experiment 1 – plate incorporation method) the test material caused no visible reduction in the growth of the bacterial background lawn at any dose level in either the absence or presence of S9-mix. However, in the second experiment (pre-incubation methodology) the test material caused a visible reduction in the growth of the bacterial background lawns of all of the tester stains dosed in the absence of S9-mix at 5000 µg/plate. No toxicity was noted to any of the bacterial strains dosed in the presence of S9-mix. The toxicity observed was of insufficient severity to prevent the test material being tested up to the maximum recommended dose level of 5000 µg/plate. No test material precipitate was observed on the plates of any of the doses tested in either the presence or absence of S9-mix.
No significant increases in the frequency of revertant colonies were recorded for any of the bacterial strains, 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.
The individual plate counts, the mean number of revertant colonies and the standard deviations for the test material, vehicle and positive controls both with and without metabolic activation for the Main test are presented in the tables below:
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 |
|||||
104 |
|
21 |
|
19 |
|
19 |
|
9 |
|
104 |
(101) |
20 |
(24) |
21 |
(18) |
9 |
(16) |
13 |
(13) |
95 |
|
32 |
|
13 |
|
21 |
|
16 |
|
EXPERIMENT 2
Number of revertants (mean number of colonies per plate) |
|||||||||
Base-pair substitution type |
Frameshift type |
||||||||
TA100 |
TA1535 |
WP2uvrA- |
TA98 |
TA1537 |
|||||
104 |
|
20 |
|
19 |
|
22 |
|
12 |
|
102 |
(101) |
28 |
(22) |
25 |
(25) |
16 |
(19) |
11 |
(11) |
98 |
|
19 |
|
30 |
|
19 |
|
10 |
|
Table 2 Test Results: Range-Finding Test– Without Metabolic Activation
Test period |
From: 30 January 2010 |
To: 02 February 2010 |
||||||||||
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 |
88 92 109 |
(96) 11.2# |
20 23 23 |
(22) 1.7 |
16 16 22 |
(18) 3.5 |
21 18 18 |
(19) 1.7 |
11 14 11 |
(12) 1.7 |
|
- |
50 |
82 70 85 |
(79) 7.9 |
20 16 19 |
(18) 2.1 |
13 24 19 |
(19) 5.5 |
13 12 14 |
(13) 1.0 |
13 9 12 |
(11) 2.1 |
|
- |
150 |
85 84 89 |
(86) 2.6 |
16 21 15 |
(17) 3.2 |
16 22 14 |
(17) 4.2 |
14 14 19 |
(16) 2.9 |
13 8 13 |
(11) 2.9 |
|
- |
500 |
85 77 95 |
(86) 9.0 |
19 16 16 |
(17) 1.7 |
11 22 19 |
(17) 5.7 |
12 16 14 |
(14) 2.0 |
11 13 12 |
(12) 1.0 |
|
- |
1500 |
88 90 86 |
(88) 2.0 |
14 24 24 |
(21) 5.8 |
12 12 20 |
(15) 4.6 |
12 12 12 |
(12) 0.0 |
13 11 15 |
(13) 2.0 |
|
- |
5000 |
87 93 104 |
(95) 8.6 |
20 15 16 |
(17) 2.6 |
16 16 23 |
(18) 4.0 |
15 20 15 |
(17) 2.9 |
8 9 12 |
(10) 2.1 |
|
Positive controls
S9-Mix
- |
Name Concentration (μg/plate) No. colonies per plate |
ENNG |
ENNG |
ENNG |
4NQO |
9AA |
||||||
3 |
5 |
2 |
0.2 |
80 |
||||||||
607 517 531 |
(552) 48.4 |
1683 1649 1740 |
(1691) 46.0 |
397 428 428 |
(418) 17.9 |
113 118 121 |
(117) 4.0 |
544 534 551 |
(543) 8.5 |
|||
ENNG N-ethyl-N'-nitro-N-nitrosoguanidine
4NQO 4-Nitroquinoline-1-oxide
9AA 9-Aminoacridine
# Standard deviation
Table 3 Test Results: Range-Finding Test– With Metabolic Activation
Test period |
From: 30 January 2010 |
To: 02 February 2010 |
||||||||||
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 |
99 102 97 |
(99) 2.5# |
12 12 10 |
(11) 1.2 |
20 19 18 |
(19) 1.0 |
16 24 23 |
(21) 4.4 |
11 15 13 |
(13) 2.0 |
|
+ |
50 |
88 91 109 |
(96) 11.4 |
9 9 11 |
(10) 1.2 |
13 18 23 |
(18) 5.0 |
17 24 15 |
(19) 4.7 |
8 15 14 |
(12) 3.8 |
|
+ |
150 |
84 74 81 |
(80) 5.1 |
12 12 11 |
(12) 0.6 |
19 15 18 |
(17) 2.1 |
17 15 19 |
(17) 2.0 |
13 15 14 |
(14) 1.0 |
|
+ |
500 |
75 76 81 |
(77) 3.2 |
9 9 7 |
(8) 1.2 |
24 16 16 |
(19) 4.6 |
20 19 18 |
(19) 1.0 |
13 13 12 |
(13) 0.6 |
|
+ |
1500 |
75 85 71 |
(77) 7.2 |
9 9 12 |
(10) 1.7 |
21 16 16 |
(18) 2.9 |
18 22 15 |
(18) 3.5 |
15 16 12 |
(14) 2.1 |
|
+ |
5000 |
80 79 95 |
(85) 9.0 |
8 14 13 |
(12) 3.2 |
11 25 24 |
(20) 7.8 |
16 18 17 |
(17) 1.0 |
11 14 16 |
(14) 2.5 |
|
Positive controls
S9-Mix
+ |
Name Concentration (μg/plate) No. colonies per plate |
2AA |
2AA |
2AA |
BP |
2AA |
||||||
1 |
2 |
10 |
5 |
2 |
||||||||
1052 1258 1057 |
(1122) 117.5 |
242 213 217 |
(224) 15.7 |
166 186 223 |
(192) 28.9 |
244 260 289 |
(264) 22.8 |
143 231 96 |
(157) 68.5 |
|||
BP Benzo(a)pyrene
2AA 2-Aminoanthracene
# Standard deviation
Table 4 Test Results: Main Test– Without Metabolic Activation
Test Period |
From: 04 February 2010 |
To: 07 February 2010 |
||||||||||
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 |
109 113 80 |
(101) 18.0# |
17 19 19 |
(18) 1.2 |
28 17 17 |
(21) 6.4 |
22 24 21 |
(22) 1.5 |
8 13 13 |
(11) 2.9 |
|
- |
50 |
92 87 97 |
(92) 5.0 |
22 21 21 |
(21) 0.6 |
21 21 21 |
(21) 0.0 |
22 22 20 |
(21) 1.2 |
14 12 12 |
(13) 1.2 |
|
- |
150 |
100 105 81 |
(95) 12.7 |
17 20 18 |
(18) 1.5 |
16 16 21 |
(18) 2.9 |
19 19 15 |
(18) 2.3 |
11 12 12 |
(12) 0.6 |
|
- |
500 |
111 90 94 |
(98) 11.2 |
16 21 21 |
(19) 2.9 |
21 20 20 |
(20) 0.6 |
21 25 19 |
(22) 3.1 |
14 11 11 |
(12) 1.7 |
|
- |
1500 |
110 96 113 |
(106) 9.1 |
16 21 17 |
(18) 2.6 |
24 15 24 |
(21) 5.2 |
18 17 17 |
(17) 0.6 |
13 13 12 |
(13) 0.6 |
|
- |
5000 |
104 * 109 * 104 * |
(106) 2.9 |
21 * 21 * 17 * |
(20) 2.3 |
22 * 22 * 18 * |
(21) 2.3 |
20 * 17 * 18 * |
(18) 1.5 |
13 * 12 * 13 * |
(13) 0.6 |
|
Positive controls
S9-Mix
- |
Name Concentration (μg/plate) No. colonies per plate |
ENNG |
ENNG |
ENNG |
4NQO |
9AA |
||||||
3 |
5 |
2 |
0.2 |
80 |
||||||||
515 613 520 |
(549) 55.2 |
359 359 365 |
(361) 3.5 |
671 690 686 |
(682) 10.0 |
153 116 146 |
(138) 19.7 |
1012 888 1019 |
(973) 73.7 |
|||
ENNG N-ethyl-N'-nitro-N-nitrosoguanidine
4NQO 4-Nitroquinoline-1-oxide
9AA 9-Aminoacridine
* Partial absence of bacterial background lawn
# 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. This study has been selected as the key study because the results are sufficient in order to derive a reliable conclusion on classification and labelling in accordance with Regulation EC (No.) 1272/2008 (EU CLP). - Executive summary:
Introduction.
The method was designed to conform to the guidelines for bacterial mutagenicity testing published by the major Japanese Regulatory Authorities including METI, MHLW and MAFF. It alsoets the requirents of the OECD Guidelines for Testing of Chemicals No. 471 "Bacterial Reverse Mutation Test", Method B13/14 of Commission Regulation (EC) number 440/2008 of 30 May 2008 and the USA, EPA (TSCA) OPPTS harmonised guidelines.
Methods.
Salmonella typhimurium strains TA1535, TA1537, TA98 and TA100 and Escherichia coli strain WP2uvrA-were treated with suspensions of the test material using both the Ames plate incorporation and pre-incubation methods 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 for the range-finding test was determined in a preliminary toxicity assay and was 50 to 5000 µg/plate. The experiment was repeated on a separate day (pre-incubation method) using the same dose range as the range-finding test, 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.
In the range-finding test (Experiment 1 – plate incorporation method) the test material caused no visible reduction in the growth of the bacterial background lawn at any dose level in either the absence or presence of S9-mix. However, in the second experiment (pre-incubation methodology) the test material caused a visible reduction in the growth of the bacterial background lawns of all of the tester stains dosed in the absence of S9-mix at 5000 µg/plate. No toxicity was noted to any of the bacterial strains dosed in the presence of S9-mix. The toxicity observed was of insufficient severity to prevent the test material being tested up to the maximum recommended dose level of 5000 µg/plate. No test material precipitate was observed on the plates of any of the doses tested in either the presence or absence of S9-mix.
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 or exposure method.
Conclusion.
The test material was considered to be non-mutagenic under the conditions of this test.
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