QIAprep Spin Miniprep Kit For purification of up to 20 µg molecular biology grade plasmid DNA; KitContents: QIAGEN QIAprep Spin Miniprep Kit; For 50 high-purity plasmid minipreps: 50 QIAprep 2.0 Spin Columns, Reagents, Buffers, Collection Tubes (2 ml); Benefits: Ready-to-use plasmid DNA in minutes. Reproducible yields of molecular-biology-grade plasmid DNA. Single protocol for high- and low-copy vectors. Even higher yields with the High-Yield Supplementary Protocol. Improved QIAprep 2.0 Spin Column.