Mobility surfaces for field-inversion gel electrophoresis of linear DNA.
The mobility of linear DNA during field-inversion gel electrophoresis was measured as a function of molecular weight Mr, pulse time t, and field strength E. Values of Mr between 48.5 and 194 kilobase pairs (kb), E from 5 to 14 V/cm and pulse times of 0.3 to 12 s were used. The data are presented as three-dimensional surfaces of mobility: E:t for fixed Mr or graphs of mobility: Mr:t for fixed E. The surfaces are not smoothly increasing functions of E, Mr, or t but instead show a valley with minimum mobility and a steep rise in mobility as t increases. For a field of 10 V/cm, 1% agarose gels, and 3:1 ratio of forward:back pulse time, the forward switching time t* at which the mobility changes most rapidly is given by t* = (0.034 +/- 0.003) Mr for Mr in kb and t* in seconds. The data and equations delineate the best conditions to achieve a particular separation.
Department of Physics, Wake Forest University, Winston-Salem, NC 27109.
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Crater
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Gregg
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Holzwarth
D001435:Bacteriophages / Q000235:genetics; D004247:DNA / Q000032:analysis*; D004279:DNA, Viral / Q000032:analysis; D004586:Electrophoresis / Q000379:methods*; D004587:Electrophoresis, Agar Gel / Q000295:instrumentation / Q000379:methods*; D007834:Lasers; D008970:Molecular Weight; D013997:Time Factors
D004279:DNA, Viral; D004247:DNA