Figure 6. Differential pulse voltammetry of native plasmid DNA (-, 3 profile), DNA after exposure to specific restrictionase ((-, on 4 fragments, 2 profile) and non-specific endonuclease (-, on 3-70 - mer fragments, 1 profile). As the degree of DNA fragmentation increases, the number of registered peaks corresponding to the electrooxidation of heterocyclic bases also increases, and the intensity of the maximum peak current for the electrochemical oxidation of heterocyclic bases increases.