Abstract
In this study, the dielectric properties of ion-reduced Na- and Mg-DNA have been investigated over a frequency range 105–1010 Hz as a function of hydration and temperature, using time domain reflectometry techniques. Three distinct dispersions have been indentified, centred at frequencies of ca. 107, 108 and 1010 Hz, respectively. The lowest frequency dispersion has been attributed to localised relaxation of counter-ions associated with the phosphate groups of the DNA double helix (G. P. Archer, S. Bone and R. Pethig, J. Mol. Electron., 1990, 6, 199). The highest frequency dispersion is thought to be the result of the rotational relaxation of DNA-bound water molecules. The origin of the dispersion centred in the 108 Hz region is discussed in terms of a number of possible relaxation processes.
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