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Testing natural indigo for genotoxicity.

A Hesbert, M C Bottin, J de Ceaurriz

    Toxicology Letters
    |April 1, 1984
    PubMed
    Summary
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    Natural and synthetic indigo were tested for genotoxicity. Indigo showed mutagenicity in bacterial tests but not clastogenicity in mouse bone marrow tests, indicating a complex genotoxic profile.

    Area of Science:

    • Toxicology
    • Genetics

    Background:

    • Indigo is a widely used dye with a complex chemical nature.
    • Assessing the genotoxicity of indigo is crucial for understanding its potential health risks.

    Purpose of the Study:

    • To evaluate the genotoxicity of natural and synthetic indigo using two short-term tests.
    • To compare the mutagenic and clastogenic potential of natural versus synthetic indigo.

    Main Methods:

    • Salmonella/microsome mutagenicity assay (Ames test) using rat liver S9 preparations.
    • In vivo micronucleus test in male mouse bone marrow after oral gavage administration.

    Main Results:

    • Indigo exhibited mutagenicity in Salmonella strains TA1538 and TA98 when rat liver S9 was present.

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  • No statistically significant increase in micronucleated erythrocytes was observed in mice treated with natural indigo at doses up to 1.2 g/kg.

    • Conclusions:

    • Indigo demonstrates mutagenic activity in bacterial systems under specific metabolic conditions.
    • Natural indigo did not show clastogenic effects in the in vivo mouse micronucleus test.