Electrochemical study of the DNA desorption from the surface of carbon electrodes

This bachelor's thesis deals with the possibility of DNA desorption from the surface of carbon electrodes. Measurements were performed using linear scan voltammetry in a three- electrode configuration, with single-stranded DNA (ssDNA) of 31 nucleotides as the sample. The working electrodes were a boron-doped diamond electrode and an electrode made of highly oriented pyrolytic graphite. The efficiency of desorption was assessed by comparing the heights of oxidation signals of adsorbed nucleic bases, which were measured before and after the application of the desorption procedure. The first approach involved desorption through mixing or rinsing in solutions with different properties, specifically in organic solvents: methanol, acetone, toluene, and DMSO; in acids and bases: HCl, HNO3, NaOH; and subsequently in surfactants and detergents: Triton X-100, TWEEN 80, CTAB, and Tergazyme. Among the tested substances, a 0.1 mol·l-1 solution of NaOH and a 1 % solution of Tergazyme proved to be effective. Subsequently, the time and temperature dependence of the rinsing strength of these two solutions on ssDNA desorption were examined. From the conducted experiments, it was determined that time and temperature of the solution do not increase the efficiency of the desorption by NaOH solution. For rinsing with a..