In this kit. Combining the method of preparing membrane with high adsorption amount of DNA and selectively adsorbing DNA to achieve the purpose of rapid purification of plasmid DNA. It applies to extract up to 60ug of high purity plasmid DNA from 5-30 ml bacterial culture. It has been used in molecular biology experiments such as sequencing. in vitro transcription and translation. restriction endonuclease digestion and bacterial transformation.