Examination of band dispersion during size-selective capillary electrophoresis separations of DNA fragments.
J Chromatogr B Biomed Sci Appl
; 695(1): 103-11, 1997 Jul 18.
Article
em En
| MEDLINE
| ID: mdl-9271134
ABSTRACT
Versatile capillary electrophoresis instrumentation that permits the rapid and precise translation of a laser fluorometric detection zone along the capillary wall has been used to examine the factors which cause band broadening during size-selective separations of DNA fragments. Separations are performed using capillaries containing entangled polymer solutions. The scanning capabilities of this instrumentation facilitates the determination of diffusion coefficients under static conditions without the need to discontinue and reapply an electric field. The ability to rapidly translate the detection zone along the column allows the monitoring of the separation at various points along the capillary which enables the examination of the sources of band dispersion under kinetic conditions. Results from experiments utilizing various concentrations of both high and low molecular mass methyl cellulose polymers as sieving media are presented. It is shown that axial diffusion, even when adjusted for kinetic conditions using the Einstein relationship, does not account for the total observed band variance. Possible explanations for this behavior are presented.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
DNA
Idioma:
En
Revista:
J Chromatogr B Biomed Sci Appl
Assunto da revista:
QUIMICA CLINICA
Ano de publicação:
1997
Tipo de documento:
Article
País de afiliação:
Estados Unidos