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Genetic toxicity: in vitro

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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:
June 1992
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Comparable to guideline study with acceptable restrictions, read-across

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1992
Report date:
1992

Materials and methods

Test guideline
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 471 (Bacterial Reverse Mutation Assay)
GLP compliance:
yes
Type of assay:
bacterial reverse mutation assay

Test material

Constituent 1
Chemical structure
Reference substance name:
1,2,3-Propanetricarboxylic acid, 2-Hydroxy-, tris(C12-13-branched-alkyl)ester
EC Number:
944-989-5
Molecular formula:
C42H80O7 - C45H86O7
IUPAC Name:
1,2,3-Propanetricarboxylic acid, 2-Hydroxy-, tris(C12-13-branched-alkyl)ester
Test material form:
liquid
Details on test material:
- Name of test material: 1,2,3-Propanetricarboxylic acid, 2-Hydroxy-, tris(C12-C13-branched-alkyl)ester
- Physical state: clear liquid
- Analytical purity: 97.4 %
- Storage condition of test material: Room temperature, protected against frost, heat and direct insolation

Method

Species / strain
Species / strain / cell type:
S. typhimurium, other: Strains TA 1535, TA 1537, TA 1538, TA 100 and TA 98
Metabolic activation:
with and without
Metabolic activation system:
S9 mix, derived from the livers of male adult rats induced with Aroclor 1254
Test concentrations with justification for top dose:
Concentration range in the main test (with metabolic activation): 1, 10, 100, 1000 and 10000 µg/plate
Concentration range in the main test (without metabolic activation): 1, 10, 100, 1000 and 10000 µg/plate
Vehicle / solvent:
- Solvent: DMSO
- concentration 100 mg test substance/mL
- Justification for choice of solvent/vehicle: no data
Controls
Untreated negative controls:
yes
Negative solvent / vehicle controls:
no
True negative controls:
no
Positive controls:
yes
Positive control substance:
2-nitrofluorene
sodium azide
other: without S9 mix: 9-Aminoacridine (40 µg/plate) with strain TA1537, Sodium azide (5 µg/plate) with strains TA 1535 and TA 100, 2-Nitrofluorene (10 µg/plate) with strains TA 1538 and TA 98; with S9 mix: 2-Aminoanthracene (1 µg/plate) with all tester strains
Remarks:
the above without S9-mix and 2-Aminoanthracene with S9-mix
Details on test system and experimental conditions:
METHOD OF APPLICATION: in agar (plate incorporation)

DURATION
- Preincubation period: not applicable
- Exposure duration: 48 - 72 h

NUMBER OF REPLICATIONS: triplicates plates for the test material and negative control, two for positive controls

DETERMINATION OF CYTOTOXICITY
- Method: determination of toxicity by semiquantitative evaluation of the background lawn and the number of spontaneous revertant colonies

OTHER EXAMINATIONS:
Sterility test


Evaluation criteria:
- at the end of the assay, a sterility check on S9 mix must show less than two viable colonies per 0.5 mL
- at the end of the test, a sterility check of the test material must show less than two viable colonies per plate
- the positive conrols must produce at least a threefold increase in the number of revertant colonies with regard to the mean value for the respective negative control
- the mean number of spontaneous revertant colonies in the negative controls must correspond to the following values:
strain TA 1535: 20 ± 15; strain TA 1537: 20 ± 15; strain TA 1538: 15 ± 10; strain TA 98: 40 ± 25; strain TA 100: 150 ± 90
Statistics:
no statistics performed

Results and discussion

Test resultsopen allclose all
Key result
Species / strain:
other: Salmonella typhimurium: strains TA 1535, TA 1537, TA 1538, TA 98
Metabolic activation:
without
Genotoxicity:
negative
Cytotoxicity / choice of top concentrations:
no cytotoxicity
Vehicle controls validity:
not examined
Untreated negative controls validity:
valid
Positive controls validity:
valid
Key result
Species / strain:
S. typhimurium TA 100
Metabolic activation:
without
Genotoxicity:
other: result could not be used for judgement because of failure of positive control
Cytotoxicity / choice of top concentrations:
no cytotoxicity
Vehicle controls validity:
not examined
Untreated negative controls validity:
valid
Positive controls validity:
valid
Key result
Species / strain:
other: Salmonella typhimurium: strains TA 1535, TA 1537, TA 1538, TA 98 and TA 100
Metabolic activation:
with
Genotoxicity:
negative
Cytotoxicity / choice of top concentrations:
no cytotoxicity
Vehicle controls validity:
not examined
Untreated negative controls validity:
valid
Positive controls validity:
other: positive controls were judged to be valid, even when the increase of revertant colonies was less than 3-fold, but being 2-fold at least
Additional information on results:
- Preliminary test: The genetic characteristics of the bacterial strains were found to be unaltered.
- Test material toxicity: The test material did not induce toxic effects at a concentration of 10 mg/plate both in the absence and presence of the metabolic activation system.
- Negative control: The number of revertant colonies on the negative control plates fell within the normal range with the exception of strain TA 98 without metabolic activation.
- Positive control: The positive controls induced an at least threefold increase in the number of colonies with the exception of the positive controls with strain TA 100 with and without S9 mix and with strain TA 1535 with S9 mix. In these cases the increase of revertant colonies was not threefold: TA 100 without S9 mix 1.6, TA 100 with S9 mix: 1.8-fold; TA 1535 with S9 mix: 2.4-fold.
- Sterility test: The sterility test performed on the test material and on S9 mix did not show any bacterial contamination.

Any other information on results incl. tables

Table #1: Salmonella typhimurium reverse mutation assay without metabolic activation
Concentration
[µg/plate]
Revertant colonies / plate
mean ± SD
Strain TA 1535 Strain TA 1537 Strain TA 1538 Strain TA 98 Strain TA 100
Negative control 22 ± 5 14 ± 2 15 ± 3 17 ± 4 93 ± 12
1 25 ± 5 21 ± 1 13 ± 3 10 ± 0 95 ± 7
10 22 ± 6 14 ± 5 12 ± 1 16 ± 4 98 ± 17
100 22 ± 2 18 ± 7 11 ± 3 12 ± 3 98 ± 24
1000 18 ± 3 17 ± 6 11 ± 6 15 ± 7 116 ± 16
10000 19 ± 4 20 ± 4 9 ± 2 7 ± 2 121 ± 21
Positivecontrol 433 ± 47 96 ± 3 264 ± 31 385 ± 18 152 ± 37
Table #2: Salmonella typhimurium reverse mutation assay with metabolic activation
Concentration
[µg/plate]
Revertant colonies / plate
mean ± SD
Strain TA 1535 Strain TA 1537 Strain TA 1538 Strain TA 98 Strain TA 100
Negative control 27 ± 3 11 ± 5 18 ± 5 25 ± 4 189 ± 12
1 25 ± 5 21 ± 4 18 ± 2 26 ± 3 179 ± 23
10 21 ± 4 23 ± 3 18 ± 3 29 ± 2 213 ± 23
100 19 ± 3 20 ± 6 19 ± 4 27 ± 4 179 ± 6
1000 19 ± 4 20 ± 1 14 ± 4 26 ± 2 176 ± 24
10000 24 ± 4 20 ± 4 15 ± 1 25 ± 3 158 ± 19
Positivecontrol 66 ± 3 480 ± 23 206 ± 14 216 ± 5 335 ± 21

SD = Standard Deviation

Applicant's summary and conclusion

Conclusions:
Interpretation of results:
negative without metabolic activation
other: no evaluation of result possible for tester strain TA 100 because of failure of positive control
negative with metabolic activation valid for all strains tested

The test material did not induce an increase in the number of revertant colonies compared to the negative controls and was considered as non-mutagenic in this test-system.
Executive summary:

A test was performed to verify the mutagenic potentiol of the test material 1,2,3-Propanetricarboxylic acid, 2-hydroxy-, tris(C12-13-branched-alkyl) ester on Salmonella typhimurium according to Ames B.N., McCann J. and Yamasaki E. (1975).

The test was carried out on 5 strains of Salmonella typhimurium (TA 1535, TA 1537, TA1538, TA 98, TA 100). The mutagenic activity of the material was assessed by comparing the number of revertant colonies induced with the positive control. This activity was tested in the presence and absence of a metabolizing system and done directly in a petri dish. The test material was tested at concentrations of 100000, 10000, 1000, 100 and 10 µg/mL corresponding to doses of 10000, 1000, 100, 10 and 1 µg/petri dish. The results of the study can be summarized as follows: The test material at maximum concentration 10 mg/petri dish produced no increase in number of revertant colonies in comparison to the negative control. The result of the experiment with tester strain TA 100 without metabolic activation could not be evaluated because of a failure of the respective positive control. Nonetheless the test material 1,2,3-Propanetricarboxylic acid, 2-hydroxy-, tris(C12-13-branched-alkyl) ester was judged to be unable to induce mutations under these conditions at least in Salmonella typhimurium tester strains TA 1535, TA 1537, TA 1538 and TA 98.