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• W2023168512 abstract "There is considerable interest in using size exclusion chromatography (SEC) to analyze and purify specific plasmid isoforms, but there is currently no fundamental understanding of the effects of plasmid size and morphology on plasmid behavior in SEC. Experiments were performed for plasmids from 3.0 to 17.0kbp in size. The linear and open-circular isoforms were generated from the supercoiled plasmid by appropriate enzymatic digestion. SEC retention data were obtained using a Sephacryl S-1000 SF resin packed column and an Agilent HPLC system over a range of flow rates using buffers of different ionic strength and composition. The plasmid partition coefficients, K(P), were evaluated from the first statistical moment of the chromatographic peak. The partition coefficient decreased with increasing plasmid size as expected; K(P) varied from 0.299 to 0.045 for supercoiled plasmids of 3.0 to 17.0kbp. The partition coefficient also increased with increasing ionic strength due to the compaction of the DNA associated with the shielding of the intramolecular electrostatic interactions. For any plasmid size, the supercoiled isoform had the highest K(P) followed by the open-circular and then the linear isoform, consistent with independent estimates of the plasmid radius of gyration as determined by static light scattering. The experimental data were analyzed using available theoretical models for the partitioning of linear and cyclic polymer chains in well-defined pore geometries. These results provide important insights into the behavior of different plasmid isoforms in size exclusion chromatography." @default.
• W2023168512 created "2016-06-24" @default.
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• W2023168512 date "2009-08-01" @default.
• W2023168512 modified "2023-10-14" @default.
• W2023168512 title "Size exclusion chromatography of plasmid DNA isoforms" @default.
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• W2023168512 doi "https://doi.org/10.1016/j.chroma.2009.07.009" @default.
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