Abstract
Diatomaceous earth has been used for DNA purification as it can produce high quality plasmid DNA. We describe an alternative and economical method for plasmid DNA purification from a 50-ml bacterial culture using diatomaceous earth, plastic pipette tips, conical tubes, centrifuges, and without requiring a vacuum system. Depending on the plasmid size and the origin of replication, this method yielded 200-800 µg plasmids with an A260/A280 of 1.8-2.0. These purified plasmids are suitable for many applications such as DNA sequencing and transfection experiments.
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