[Electrical conductivity of isoionic DNA solutions].

Conductance of the DNA isoionic solutions obtained from aqueous solutions of its sodium salt using a column with mixed bed ionexchangers has been investigated. It has been found that in Kohlrausch's plots equivalent conductance slightly decreased with polymer concentration. Comparison of the degree of ionization (alpha) calculated from conductance measurements with those calculated from experimental pH values of isoionic solutions at different polymer concentrations revealed that the mobility of dissociating counterations decreases significantly under the influence of the electrostatic potential of the macroion.