Related Experiment Videos
Genotoxic activity of potassium permanganate in acidic solutions
M De Méo1, M Laget, M Castegnaro
1Laboratoire de Microbiologie, Faculté de Pharmacie, Marseille, France.
Abstract:
Potassium permanganate (KMnO4) combined with sulfuric acid is a strongly oxidizing mixture which has been recommended for the destruction and the decontamination of various mutagens/carcinogens in the publication series of the International Agency for Research on Cancer. Evaluation of the genotoxicity of 4 potassium permanganate solutions was performed using a microtechnique of the Ames test with the tester strains TA97, TA98, TA100 and TA102 with and without metabolic activation. Presence of direct-acting mutagens was detected in all the samples with the tester strain TA102 without S9 mix (163-357 revertants/microliters of the solutions). Three samples containing either acetone or ethanol as an organic solvent also induced a mutagenic response on tester strain TA100 without S9 mix (167-337 revertants/microliters). In addition, DNA damage in human peripheral blood lymphocytes was also measured for one of the mixtures by a new technique: the single-cell gel assay (SCGA). A sample with no organic solvent induced DNA damage in human lymphocytes with a dose-response relationship as determined by SCGA. The major mutagenic agent generated by the permanganate solutions was found to be manganese ion (Mn2+). Both manganese sulfate (MnSO4) and manganese chloride (MnCl2) gave mutagenic dose-response relationships on tester strain TA102 without S9 mix. The mutagenic potencies were 2.8 and 2.4 revertant/nmole for MnSO4 and MnCl2 respectively. MnCl2 also induced DNA damage in human lymphocytes as determined by the SCGA. The genotoxic effects of KMnO4 in acidic conditions were probably mediated by the conversion of MnO4- to Mn2+. KMnO4 in alkaline solutions did not produce mutagenic species and may offer an alternative for the degradation of genotoxic compounds.
Insights
Potassium permanganate in acidic solutions generates mutagenic manganese ions (Mn2+), detected using the Ames test and single-cell gel assay. Alkaline solutions, however, did not produce mutagenic species, offering a safer alternative for degrading genotoxic compounds.
Area of Science:
- Toxicology
- Genetics
- Environmental Science
Background:
- Potassium permanganate (KMnO4) and sulfuric acid mixtures are used for decontaminating mutagens/carcinogens.
- The genotoxicity of these mixtures requires thorough evaluation for safe application.
Purpose of the Study:
- To assess the genotoxicity of potassium permanganate solutions using bacterial and human cell assays.
- To identify the specific agents responsible for mutagenicity and DNA damage.
Main Methods:
- Microscale Ames test with tester strains TA97, TA98, TA100, and TA102.
- Single-cell gel assay (SCGA) for DNA damage in human lymphocytes.
- Testing of manganese sulfate (MnSO4) and manganese chloride (MnCl2) for mutagenicity.
Main Results:
- Acidic potassium permanganate solutions induced mutagenicity in tester strain TA102 (without metabolic activation).
- DNA damage was observed in human lymphocytes exposed to one mixture via SCGA.
- Manganese ion (Mn2+) was identified as the primary mutagenic agent, with dose-response relationships observed for MnSO4 and MnCl2.
Conclusions:
- Potassium permanganate in acidic conditions generates genotoxic manganese ions.
- Alkaline potassium permanganate solutions appear to be non-mutagenic and a potential alternative for chemical degradation.