Separation of plasmid DNA isoforms using centrifugal ultrafiltration

Ehsan Espah Borujeni, Andrew L. Zydney

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Centrifugal ultrafiltration is a well-established method for concentrating and purifying DNA. Here, we describe the use of centrifugal ultrafiltration for the separation of plasmid DNA isoforms based on differences in elongational flexibility of the supercoiled, open-circular, and linear plasmids. Transmission of each isoform is minimal below a critical value of the filtration velocity, which is directly related to the magnitude of the centrifugal speed and the system geometry. A discontinuous diafiltration process was used to enrich the desired isoform, as determined by agarose gel electrophoresis. The simplicity and efficacy of this membrane-based separation are attractive for multiple applications requiring the use of separated DNA isoforms.

Original languageEnglish (US)
Pages (from-to)49-56
Number of pages8
Issue number1
StatePublished - Jul 2012

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • General Biochemistry, Genetics and Molecular Biology


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