A patient with bacterial periodontitis has been administered iontophoresis with the use of iodine solution. Specify the mechanism of therapeutic action of this agent:

Answer options

1. Inhibition of the cell wall formation
2. Albumin formation
3. Reduction of the nitro group under the effect of nitroreductase
4. Substitution of hydrogen atoms when the protein amino group contains a nitrogen atom
5. Changing the surface tension of the bacterial cell membrane

Explanation

Iodine is reduced to hydrogen iodide through substitution.