The Presto Endotoxin Free Mini Plasmid Kit was designed for transfection grade plasmid DNApurification from 1-5 ml of cultured E. coli cells using silica-membrane spin columns. A modified alkaline lysis method and RNase treatment are used to obtain clear cell lysate with minimal genomic DNA and RNA contaminants. In addition, an efficient endotoxin removal step is integrated in the procedure and endotoxins are precipitated in a proprietary reagent. TrueBlue Lysis Buffer (an optional color indicator) is included with the kit in order to prevent common handling errors, ensuring efficient cell lysis and neutralization. DNA phenol extraction or alcohol precipitation is not required and the entire procedure can be completed within 50 minutes. The purified endotoxin free plasmid DNA is ready for use in transfection, restriction enzyme digestion, ligation, PCR, and sequencing reactions.