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Diss Factsheets

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:
April 18 - 29, 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2016
Report date:
2016

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 471 (Bacterial Reverse Mutation Assay)
GLP compliance:
yes (incl. QA statement)
Type of assay:
bacterial reverse mutation assay

Test material

Constituent 1
Chemical structure
Reference substance name:
DL-2-hydroxy-2-phenylacetic acid
EC Number:
210-277-1
EC Name:
DL-2-hydroxy-2-phenylacetic acid
Cas Number:
611-72-3
Molecular formula:
C8H8O3
IUPAC Name:
hydroxy(phenyl)acetic acid
Test material form:
solid
Specific details on test material used for the study:
Name: Art. 806913
Chemical name: DL-Mandelic acid
Appearance: white, crystalline
Released until: 31 May 2020
Solvent for test material: ultra-pure water (H2O)
Concentration of solvent: 100 µL/plate

Method

Target gene:
Salmonella: histidine operon
E coli. tryptophane operon
Species / strain
Species / strain / cell type:
S. typhimurium TA 1535, TA 1537, TA 98, TA 100 and E. coli WP2
Details on mammalian cell type (if applicable):
- Type and identity of media:
- Properly maintained: yes
- 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:
S9 mix from Aroclor 1254 pretreated rats
Test concentrations with justification for top dose:
1st series: 5, 15.8, 50, 158, 500, 1580, 5000 µg/plate
2nd series: 50, 158, 500, 1580, 5000 µg/plate
Vehicle / solvent:
H2O
Controls
Untreated negative controls:
yes
Negative solvent / vehicle controls:
yes
Positive controls:
yes
Positive control substance:
other: Sodium azide, 2-Aminoanthracene, 9-Aminoacridine, Daunomycin, 4-Nitroquinoline-N-oxide
Details on test system and experimental conditions:
METHOD OF APPLICATION: in agar (plate incorporation)

DURATION
- Preincubation period: 3-5 hours
- Exposure duration: about 2 days


SELECTION AGENT (mutation assays): Histidine, Tryptophane

NUMBER OF REPLICATIONS:
Negative controls 6
Test material 3
Positive controls 3


NUMBER OF CELLS EVALUATED: about 1e9


DETERMINATION OF CYTOTOXICITY
- Method: other: background cytotox


OTHER:
Evaluation criteria:
- valid assay (cf. laboratory historical data)
- no or weak increase in revertant colonies = negative
- clear, dose dependent (over at least two concentrations), and reproducible increase in revertant colonies= positve
Statistics:
not applied

Results and discussion

Test results
Key result
Species / strain:
S. typhimurium TA 1535, TA 1537, TA 98, TA 100 and E. coli WP2
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
- Effects of pH: no
- Effects of osmolality: no
- Evaporation from medium: no
- Water solubility: ok
- Precipitation: yes, at 1580 µg/plate with and without metabolic activation
- Other confounding effects: no

Applicant's summary and conclusion

Conclusions:
With and without addition of S9 mix as the external metabolizing system, the test material was not mutagenic under the experimental conditions described.
Executive summary:

This study was performed according to GLP and the methods applied are fully compliant with OECD TG 471. With and without addition of S9 mix as the external metabolizing system, the test material was not mutagenic under the experimental conditions described.