2-[3-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)prop-1-enyl]-1,3,3-trimethyl-3H-indolium chloride

Endpoint summary

Key value for chemical safety assessment

Genetic toxicity in vitro

Description of key information

Gene mutation in vitro:

Ames test:

Data available for the structurally and functionally similar read across chemicals has been reviewed to determine the mutagenic nature of the test chemical Basic red 12. The studies are as mentioned below:

Ames mutagenicity test was conducted for two test chemicals to evaluate its genotoxic effects when exposed to Salmonella typhimurium strains TA98, TA100, TA102, and TA1535 with dose concentration of 5–5000 µg/plate in plate incorporation assay. The plates were incubated for 48 h. The doses of test chemical, together with the appropriate concurrent positive controls, were tested in triplicate on each tester strain with and without S9 metabolic activation. A dose-related increase (at least 2-fold) in revertant colonies was used to define a statistically significant mutagenic response. Both the test chemicals did not induce gene mutation in the Salmonella typhimuriumTA98, TA100, TA102, and TA1535 both in the presence and absence of S9 activation system and hence the chemical is not likely to be a gene mutant.

Ames mutagenicity test was also conducted for another test chemical to evaluate its genetoxic effects when exposed to Salmonella typhimurium strains TA98, TA100, TA1535, TA1537, and TA1538 with dose concentration of 33 - 10000 µg/plate in plate incorporation assay. Based on the preliminary study conducted, the test compound was used at a five dose level from 33-10000 µg/plate. The plates were incubated for 48 h at 37±2 °C. Five doses of test chemical, together with the appropriate concurrent solvent and positive controls, were tested in triplicate on each tester strain without metabolic activation and also with activation by induced rat and hamster liver S9 preparations. For a test article to be considered positive, it had to induce at least a doubling (TA98, TA100, and TA1535) in the mean number of revertants per plate of at least one tester strain. This increase in the mean revertants per plate had to be accompanied by a dose response to increasing concentrations of the test chemical. The test chemical did not induce gene mutation in the Salmonella typhimuriumTA98, TA100, TA1535, TA1537, and TA1538 both in the presence and absence of S9 activation system and hence the chemical is not likely to be a gene mutant.

Based on the data summarized, Basic red 12 is expected to not induce gene mutation in the Salmonella typhimurium strains used in the presence and absence of S9 metabolic activation system and hence it is not likely to be mutagenic in vitro.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (negative)

Additional information

Gene mutation in vitro:

Data available for the structurally and functionally similar read across chemicals has been reviewed to determine the mutagenic nature of the test chemical Basic red 12 (6320 -14 -5). The studies are as mentioned below:

Ames mutagenicity test was conducted for two test chemicals to evaluate its genotoxic effects when exposed to Salmonella typhimurium strains TA98, TA100, TA102, and TA1535 with dose concentration of 5–5000 µg/plate in plate incorporation assay. The plates were incubated for 48 h. The doses of test chemical, together with the appropriate concurrent positive controls, were tested in triplicate on each tester strain with and without S9 metabolic activation. A dose-related increase (at least 2-fold) in revertant colonies was used to define a statistically significant mutagenic response. Both the test chemicals did not induce gene mutation in the Salmonella typhimuriumTA98, TA100, TA102, and TA1535 both in the presence and absence of S9 activation system and hence the chemical is not likely to be a gene mutant.

Ames mutagenicity test was also conducted for another test chemical to evaluate its genetoxic effects when exposed to Salmonella typhimurium strains TA98, TA100, TA1535, TA1537, and TA1538 with dose concentration of 33 - 10000 µg/plate in plate incorporation assay. Based on the preliminary study conducted, the test compound was used at a five dose level from 33-10000 µg/plate. The plates were incubated for 48 h at 37±2 °C. Five doses of test chemical, together with the appropriate concurrent solvent and positive controls, were tested in triplicate on each tester strain without metabolic activation and also with activation by induced rat and hamster liver S9 preparations. For a test article to be considered positive, it had to induce at least a doubling (TA98, TA100, and TA1535) in the mean number of revertants per plate of at least one tester strain. This increase in the mean revertants per plate had to be accompanied by a dose response to increasing concentrations of the test chemical. The test chemical did not induce gene mutation in the Salmonella typhimuriumTA98, TA100, TA1535, TA1537, and TA1538 both in the presence and absence of S9 activation system and hence the chemical is not likely to be a gene mutant.

Based on the data summarized, Basic red 12 is expected to not induce gene mutation in the Salmonella typhimurium strains used in the presence and absence of S9 metabolic activation system and hence it is not likely to be mutagenic in vitro.

 

Based on the data available from the read across, 1,3,3-trimethyl-2-[(1E)-3-[(2E)-1,3,3-trimethyl-2,3 -dihydro- 1H-indol-2-ylidene] prop-1-en-1-yl] -3H-indol-1 -um chloride/ Basic red 12 (CAS no 6320 -14 -5) does not exhibit gene mutation in vitro. Hence the test chemical is not likely to classify as a gene mutant as per the criteria mentioned in CLP regulation.

Justification for classification or non-classification

Based on the data available from the read across, 1,3,3-trimethyl-2-[(1E)-3-[(2E)-1,3,3-trimethyl-2,3 -dihydro- 1H-indol-2-ylidene] prop-1-en-1-yl] -3H-indol-1 -um chloride/ Basic red 12 (CAS no 6320 -14 -5) does not exhibit gene mutation in vitro. Hence the test chemical is not likely to classify as a gene mutant as per the criteria mentioned in CLP regulation.