【摘要】 目的:从大肠杆菌克隆子中提取和纯化质粒DNApPC41和pcDNA3。方法:采用碱裂解法将质粒DNA从菌体细胞中分离出来,进一步用聚乙二醇沉淀法、透析袋电洗脱法、低溶点胶回收法、玻璃纤维柱层析法纯化质粒DNA。用分光光度法测其A260、A280值,确定其浓度和纯度。通过酶切分析确定其质粒大小。结果:4种方法获得的质粒DNA浓度为0.12～0.24g/L,聚乙二醇沉淀法、透析袋电洗脱法、低溶点胶回收法和玻璃纤维柱层析法的A260/A280比值依次为1.9、2.2、2.2、2.6。酶切鉴定质粒pPC41大小为10.6kb,pcDNA3大小为5.4kb。结论:4种方法均能有效地从大肠杆菌克隆子中提取和纯化得到质粒DNA。其中玻璃纤维柱层析法获得的质粒DNA纯度最高,是获取高纯度质粒DNA的有效方法之一。更多还原

【Abstract】 Objective:To Extract and purify plasmid DNA pPC41 and pcDNA3.Methods: Bacteria were collected and lyzed by the alkaline lysis method. The plasmid pPC41 carrying structural gene pac and clone expression vector pcDNA3 were extracted and purified from E. coli clone by the polyethylene glycol precipitating method, the electroelution into dialysis bags method, the low melting temperature agarose gel and glass fiber column chromatography.The concentration, purity and molecular weight were determined by spectrophotometry, restriction enzyme and agarose gel electrophoresis.Results:The concentration of plasmid DNA of this experiment in general was 0.12~0.24 g/L, and A\-\{260\}/A\-\{280\} of the polyethylene glycol precipitating method, the electroelution into dialysis bags method, the low metling temperature agrose gel and glass fiber column chromatograhy were respectively 1.9, 2.2, 2.2 and 2.6. Molecular weight of pPC41 and pcDNA3 was respectively 10.6 kb and 5.4 kb. Conclusion:[WT5”,6BZ] The four methods can obtain pure plasmid DNA. Purity of plasmid DNA obtained by glass fiber column chromatography method is the highest in the four methods. Glass fiber column chromatography is one of the effective methods getting highly purified plasmid DNA.\;更多还原