(Science: technique) separation of ionic molecules, (principally proteins) by the differential migration through a gel according to the size and ionic charge of the molecules in an electrical field. High resolution techniques normally use a gel support for the fluid phase.
Examples of gels used are starch, acrylamide, agarose or mixtures of acrylamide and agarose. Frictional resistance produced by the support causes size, rather than charge alone, to become the major determinant of separation.
Smaller molecules with a more negative charge will travel faster and further through the gel toward the anode of an electrophoretic cell when high voltage is applied. Similar molecules will group on the gel. They may be visualised by staining and quantitated, in relative terms, using densitometers which continuously monitor the photometric density of the resulting stain.
The electrolyte may be continuous (a single buffer) or discontinuous, where a sample is stacked by means of a buffer discontinuity, before it enters the running gel/ running buffer. The gel may be a single concentration or gradient in which pore size decreases with migration distance.
in sds gel electrophoresis of proteins or electrophoresis of polynucleotides, mobility depends primarily on size and is used to determined molecular weight. In pulse field electrophoresis, two fields are applied alternately at right angles to each other to minimise diffusion mediated spread of large linear polymers.
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... mRNA, and REVERSE binds at exon-exon junction of the next exon. After strange qPCR result I checked one more time integrity of my RNA aliquot by electrophoresis and it looked ok - so I don't if it's a problem with degradation??? Any replies will be much appreciated.
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... Recently I got a weird-shaped band on my western blot. It is like an upside-down of smiling face in each lane. I use the same loading buffer, electrophoresis buffer, lysis buffer, and also the same 1st and 2nd antibody for this experiment. I also try to reduce the amount of protein in each ...
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