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  • 實驗方法> 生物化學技術> 化學生物學實驗技術>Plasmid Preparation on Sephacryl S1000

    Plasmid Preparation on Sephacryl S1000

    關鍵詞: plasmid preparation sephacryl來源: 互聯網

    Production of pure plasmid DNA is a prerequisite for most laboratories engaged in recombinant DNA research. There are a number of procedures available for plasmid purification, all of which have common features; namely, (1 ) growth of plasmid-containing bacteria, (2 ) lysis of bacteria, (3 ) low-speed centrifugation to remove the majority of bacterial DNA and protein, (4) an ultracentrifugation step in cesium chloride and ethidium bromide to separate plasmid DNA from RNA and chromosomal DNA, and (5) recovery of plasmid DNA band (extraction of ethidium bromide and cesium chloride). Steps (4) and (5) of this procedure are expensive, time-consuming, and require expensive machinery [ultracentrifuge, rotor(s)]. In addition, incomplete extraction of ethidium bromide can result in plasmid DNA that is not manipulable by many enzymes commonly used in DNA research.

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