Performing Minipreps with Homebrew Buffers

The alkaline-lysis miniprep is a critical tool in the arsenal of a molecular biologist. It allows one to rapidly isolate only plasmid DNA from a bacterial cell by leveraging the increased resilience of this (usually supercoiled) form of DNA against highly basic conditions. Minipreps are routinely performed to isolate plasmids that serve as substrates for further assembly work, for PCR amplification of specific gene segments, for direct application in other species or strains, or simply for archival uses (DNA can be easier and cheaper to store than the cells containing it).