Tripotassium [5-[(4-amino-6-chloro-1,3,5-triazin-2-yl)amino]-4-hydroxy-3-[(2-hydroxy-4-sulpho-1-naphthyl)azo]naphthalene-2,7-disulphonato(5-)]cuprate(3-)

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:

20.10.2015 – 22.04.2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2015

Report date:

2016

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

EU Method B.13/14 (Mutagenicity - Reverse Mutation Test Using Bacteria)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of assay:

bacterial reverse mutation assay

Test material

Test material information

Constituent 1

Reference substance name:

Tripotassium [5-[(4-amino-6-chloro-1,3,5-triazin-2-yl)amino]-4-hydroxy-3-[(2-hydroxy-4-sulpho-1-naphthyl)azo]naphthalene-2,7-disulphonato(5-)]cuprate(3-)

EC Number:

304-149-5

EC Name:

Tripotassium [5-[(4-amino-6-chloro-1,3,5-triazin-2-yl)amino]-4-hydroxy-3-[(2-hydroxy-4-sulpho-1-naphthyl)azo]naphthalene-2,7-disulphonato(5-)]cuprate(3-)

Cas Number:

94246-75-0

Molecular formula:

C23H11ClCuN7O11S3.3K

IUPAC Name:

tripotassium 18-[(4-amino-6-chloro-1,3,5-triazin-2-yl)amino]-13λ³,15λ³-dioxa-1λ⁴,2-diaza-14-cuprahexacyclo[12.11.0.0³,¹².0⁴,⁹.0¹⁶,²⁵.0¹⁷,²²]pentacosa-1,4(9),5,7,10,16,18,20,22,24-decaene-14,14-bis(ylium)-13,15-diide-10,20,24-trisulfonate

impurity 1

Reference substance name:

Potassium chloride

EC Number:

231-211-8

EC Name:

Potassium chloride

Cas Number:

7447-40-7

Molecular formula:

ClK

IUPAC Name:

potassium chloride

Test material form:

solid: particulate/powder

Details on test material:

- Name of test material (as cited in study report): Reactive Blue 234
- Other name: Ostazin Blue H-5R
- Lot/batch No.: 8002
- Expiration date of the lot/batch: unlisted

Method

Target gene:

gene for histidine or tryptophan synthesis

Species / strain

Species / strain 1

Species / strain / cell type:

S. typhimurium TA 1535, TA 1537, TA 98 and TA 100

Species / strain 2

Species / strain / cell type:

E. coli WP2 uvr A

Metabolic activation:

with and without

Metabolic activation system:

supernatant of rat liver and a mixture of cofactors

Test concentrations with justification for top dose:

50, 150, 500, 1500, 5000 μg
Selection of doses/toxicity: 2 mL of water for injection was added to 100 mg of the test substance to reach the maximum dose recommended in guidelines - 5000 μg per plate

Vehicle / solvent:

Water for injection, Ardeapharma, Lot. No.: 1501210041, exp. 01/2017
- Justification for choice of solvent/vehicle: solubility of the substance

Controls

Controls 1

Untreated negative controls:

yes

Negative solvent / vehicle controls:

yes

Positive controls:

yes

Positive control substance:

sodium azide

Controls 2

Untreated negative controls:

yes

Negative solvent / vehicle controls:

yes

Positive controls:

yes

Positive control substance:

N-ethyl-N-nitro-N-nitrosoguanidine

Controls 3

Untreated negative controls:

yes

Negative solvent / vehicle controls:

yes

Positive controls:

yes

Positive control substance:

other: 4-nitro-o-phenylenediamine 2-aminofluorene 2-aminoanthracene 9-aminoacridine hydrochloride monohydrate

Details on test system and experimental conditions:

The bacterial tester strains
Salmonella typhimurium
TA 1535 (CCM 3814, lot. No. 2101200916917),
TA 98 (CCM 3811, lot No. 01022001220053),
TA 100 (CCM 3812, lot No. 0102201220054) and
TA 1537 (CCM 3815, lot No. 2101200916918)
as well as
Escherichia coli WP2 uvrA (CCM 4751, lot No. 2104200512732),
were obtained from Czech Collection of Microorganisms (CCM) of Masaryk University, Brno.
Strains TA 98 and TA 1537 detect frame shift mutations, strains TA 100 and TA 1535 serve to detection of base-pair substitution mutations, and strain E.coli WP2uvrA detects cross-linking mutagens


METHOD OF APPLICATION: in medium; in agar (plate incorporation)

NUMBER OF REPLICATIONS: two series

DETERMINATION OF CYTOTOXICITY
- Method: relative total growth

Evaluation criteria:

The main criterion for evaluation of results was modified two-fold increase rule, which is compatible with the application of statistical methods (2, 3). After this rule the result is positive, if a reproducible doseresponse effect occurs and/or a doubling of the ratio Rt/Rc is reached.

Statistics:

For the evaluation of results, the modified two-fold increase rule was used, which is compatible with the application of statistical methods:
Dunkel V. C.. Chu K.C. (1980): Evaluation of methods for analysis of microbial mutagenicity assays in The Predictive Value of Short-Term Screening Tests in Carcinogenicity Evaluation. Elsevier North-Holland Biomedical Press. 231 - 417
Claxton L. D. et al. (1987): Guide for the Salmonella typhimurium/mammalian microsome tests for bacterial mutagenicity. Mutat. Res. 189. 83 - 91

Results and discussion

Test results

Test results 1

Key result

Species / strain:

S. typhimurium TA 1535

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

not determined

Vehicle controls validity:

valid

Untreated negative controls validity:

valid

Positive controls validity:

valid

Test results 2

Key result

Species / strain:

S. typhimurium TA 1537

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

not determined

Vehicle controls validity:

valid

Untreated negative controls validity:

valid

Positive controls validity:

valid

Test results 3

Key result

Species / strain:

S. typhimurium TA 98

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

Test results 4

Key result

Species / strain:

S. typhimurium TA 100

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

not determined

Vehicle controls validity:

valid

Untreated negative controls validity:

valid

Positive controls validity:

valid

Test results 5

Key result

Species / strain:

E. coli WP2 uvr A

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

not determined

Vehicle controls validity:

valid

Untreated negative controls validity:

valid

Positive controls validity:

valid

Additional information on results:

HISTORICAL CONTROL DATA:
Each experiment included corresponding positive (reference mutagens) and negative controls (untreated
control, solvent control). Untreated controls contain no solvent and negative controls contain 0.1 mL of
water for injection. All the control numbers were compared with historical ranges of mutant frequencies
obtained in our laboratory. The actual numbers were in ranges of the historical numbers.

ADDITIONAL INFORMATION ON CYTOTOXICITY:
For toxicity experiment, the starting solution (5000 μg/0.1 mL) was diluted to concentration series 10 – 5000 μg per plate. The concentration row was tested for toxicity in strain TA 98 without metabolic activation.
No toxicity of the test substance or precipitation was observed at evaluation so the dose of 5000 μg per plate was used as maximum for the first mutagenicity experiments as well. The maximum concent ration was diluted according to the rules given in guidelines (five different analysable concentrations with approximately half log ,i.e. approximately #10, intervals between test points). The doses used were 50, 150, 500, 1500 and 5000 μg per plate

Applicant's summary and conclusion

Conclusions:

Under the above-described experimental design, the test substance, Reactive Blue 234, was non mutagenic for all the Salmonella typhimurium as well as Escherichia coli strains with as well as without metabolic activation.

Executive summary:

The test substance Reactive Blue 234 was assayed for the mutagenicity by the Bacterial Reverse Mutation Test. The performed test was based on EU method B.13/14 Mutagenicity – Reverse mutation test using bacteria, which is analogous to the OECD Test Guideline No. 471.

Four indicator Salmonella typhimurium strains TA 98, TA 100, TA 1535, TA 1537 and one indicator Escherichia coli WP2 uvrA strain were used. The test substance was diluted in water for injection and assayed in doses of 50-5000 g per plate, which were applied to plates in volume of 0.1 mL.

Experiments were performed without as well as with metabolic activation with a supernatant of rat liver and a mixture of cofactors. The second experiments were performed with pre-incubation for 30 minutes at 37 °C and shaking.

Under the above-described experimental design, the test substance, Reactive Blue 234, was non-mutagenic for all the used bacterial strains with as well as without metabolic activation.