QIAGEN Plasmid Kits For purification of up to 10 mg transfection-grade plasmid or cosmid DNA; KitContents: QIAGEN Plasmid Midi Kit; 25 QIAGEN-tip 100, Reagents, Buffers; Benefits: Purity equivalent to 2 x CsCl gradient centrifugation. High yields of plasmid DNA. Cost-effective preparations. LyseBlue for optimum lysis and maximum DNA yield.