A method for the intermediate recovery of plasmid DNA (pDNA) from alkaline lysates is described that comprises differential isopropanol precipitation steps. In a first low-cut precipitation, a smaller amount of isopropanol (20% v/v) is used so that only high molecular weight RNA precipitates. After solid liquid separation, a high-cut precipitation is performed by bringing isopropanol concentration to 70% v/v to precipitate pDNA. Tests made with lysates show that the differential precipitation increases purity threefold compared to the conventional one-step precipitation at 70% v/v without affecting pDNA recovery (>80%).
CITATION STYLE
Wagner, A., Silva-Santos, A. R., Rosa, S. S., Gierak, S., Azevedo, A. M., & Prazeres, D. M. F. (2021). Primary Purification of Plasmid DNA Using Differential Isopropanol Precipitation. In Methods in Molecular Biology (Vol. 2197, pp. 151–165). Humana Press Inc. https://doi.org/10.1007/978-1-0716-0872-2_8
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