The Miraprep: A Protocol that Uses a Miniprep Kit and Provides Maxiprep Yields
Fig 1
Addition of Ethanol leads to increased plasmid DNA yield.
(A) DNA plasmid preps of the indicated plasmids with different concentrations of ethanol. Top: DNA concentration as assessed by OD260, middle: 2 μl of each sample was electrophoresed on an agarose gel and visualized by ethidium bromide staining, bottom: OD260/280 ratio. The GeneJET Plasmid Miniprep kit was used. (B) As in (A) but the Qiagen Miniprep kit was used. (C) Plasmid preparations with the GenElute kit, comparing either the standard Miniprep procedure or the Miraprep (using 1x volume of ethanol). The Mirapreps in (C) included fresh addition of RNase (50 μg/ml) as in the final Miraprep protocol, and values are the average of two experiments, showing mean and standard deviation.