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The I-Blue Midi Plasmid Endo-Free Kit (Endotoxin Free) uses pre-packed anion-exchange resin columns to purify plasmid DNA from 50 - 150 ml of cultured bacterial cells. I-Blue Lysis Buffer is included with the kit in order to prevent common handling errors, ensuring efficient cell lysis and SDS precipitation. The I-Blue lysis buffer is added during the re-suspension step, then PM2 buffer is added. After the addition of the PM2 buffer, the sample will begin to turn blue during mixing, when the sample is completely blue complete lysis has been achieved. Colorless areas or brown clumps indicate incomplete lysis and mixing should continue until the sample is entirely blue. During the neutralization step, PM3 buffer is added, and shaking the tube vigorously will begin to turn the sample back to a neutral color. Once the sample is completely colorless, neutralization is complete. PER buffer can now be added to remove endotoxins. Binding, washing and elution of the purified Plasmid DNA can now be done.
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