Related Experiment Videos
Salmonella mutagenicity tests: V. Results from the testing of 311 chemicals
E Zeiger1, B Anderson, S Haworth
1Experimental Carcinogenesis and Mutagenesis Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC.
Abstract:
311 chemicals were tested under code, for mutagenicity, in Salmonella typhimurium; 35 of the chemicals were tested more than once in the same or different laboratories. The tests were conducted using a preincubation protocol in the absence of exogenous metabolic activation, and in the presence of liver S-9 from Aroclor-induced male Sprague-Dawley rats and Syrian hamsters. Some of the volatile chemicals were also tested in desiccators. A total of 120 chemicals were mutagenic or weakly mutagenic, 3 were judged questionable, and 172 were non-mutagenic. The remaining 16 chemicals produced different responses in the two or three laboratories in which they were tested. The results and data from these tests are presented.
Insights
A study tested 311 chemicals for mutagenicity in Salmonella typhimurium. Of these, 120 chemicals were found to be mutagenic or weakly mutagenic, indicating potential genetic toxicity.
Area of Science:
- Toxicology
- Genetics
- Biochemistry
Background:
- Mutagenicity testing is crucial for assessing chemical safety.
- Salmonella typhimurium assays are widely used for initial genotoxicity screening.
- Standardized testing protocols ensure reliable and comparable results.
Purpose of the Study:
- To evaluate the mutagenicity of 311 coded chemicals using Salmonella typhimurium.
- To assess the reliability of results through repeat testing in multiple laboratories.
- To provide a comprehensive dataset on chemical mutagenicity.
Main Methods:
- Chemicals were tested using a preincubation protocol.
- Tests were performed with and without exogenous metabolic activation (liver S-9 from rats and hamsters).
- Volatile chemicals were analyzed using desiccator methods.
Main Results:
- 120 chemicals (38.6%) were mutagenic or weakly mutagenic.
- 172 chemicals (55.3%) were non-mutagenic.
- 16 chemicals (5.1%) yielded variable results across laboratories.
Conclusions:
- The study identified a significant number of mutagenic chemicals within the tested set.
- Variability in results for a subset of chemicals highlights the need for careful interpretation and potential further investigation.
- The data provides valuable insights into the genotoxic potential of various chemical compounds.