A method of isolating circular plasmid DNA from cleared lysates of E. coli is described. Purification is achieved by virtue of the rapid re-annealing kinetics or supercoiled DNA. After a brief denaturation step, double stranded plasmid DNA is separated from denatured chromosomal DNA and RNA in a two-phase partition system using dextran and polyethylene glycol. The method is much more rapid than the conventional dye-centrifugation technique and plasmid DNA of comparable purity and yield is obtained.
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Ohlsson et al. (1978) studied this question.
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