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Simultaneous measurements of the electrophoretic mobility, diffusion coefficient and orientation of dsDNA during electrophoresis in polymer solutions
Author(s) -
Nkodo Axel Ekani,
Tinland Bernard
Publication year - 2002
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/1522-2683(200208)23:16<2755::aid-elps2755>3.0.co;2-#
Subject(s) - electrophoresis , diffusion , orientation (vector space) , polymer , chemistry , chromatography , analytical chemistry (journal) , materials science , physics , thermodynamics , organic chemistry , geometry , mathematics
We determined simultaneously the electrophoretic mobility, diffusion coefficient D and molecular orientation during electrophoresis of dsDNAs in polymer solutions ranging from the dilute to the semidilute regime. We established, for the first time, master scaling laws for the diffusion coefficient showing a universal behavior. A model found in the literature designed for the dilute regime allows, surprisingly, to describe the mobility data over the whole range of concentrations studied and at the same time the biased reptation with fluctuations (BRF) failed for the semidilute regime, even when constraint release of the network was taken into account. These quantitative determinations of D are of practical interest to evaluate band broadening during capillary electrophoresis and provide data for stimulating investigation of the physics of DNA electrophoretic motion.