title: [Chromatographic separation of plasmid DNA by anion-exchange cryogel].
abstract: Plasmid DNA (pDNA) is used as an important vector for gene therapy, and its wide application is restricted by the purity and yield. To obtain high-purity pDNA, a chromatographic method based on anion-exchange supermacroporous cryogel was explored. The anion-exchange cryogel was prepared by grafting diethylaminoethyl-dextran to the epoxide groups of polyacrylamide-based matrix and pUC19 plasmid was used as a target to test the method. The plasmid was transferred into Escherichia coli DH5alpha, cultivated, harvested and lysed. The obtained culture was centrifuged and the supernatant was used as the plasmid feedstock, which was loaded into the anion-exchange cryogel bed for chromatographic separation. By optimizing the pH of running buffer and the elution conditions, high-purity pDNA was obtained by elution with 0.5 mol/L sodium chloride solution at pH 6.6. Compared to the traditional methods for purification of pDNA, animal source enzymes and toxic reagents were not involved in the present separation process, ensuring the safety of both the purification operations and the obtained pDNA.
authors.affiliation: State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032, Zhejiang, China.
authors.forename: Yantao
authors.initials: Y
authors.lastname: Guo
authors.forename: Shaochuan
authors.initials: S
authors.lastname: Shen
authors.forename: Junxian
authors.initials: J
authors.lastname: Yun
authors.forename: Kejian
authors.initials: K
authors.lastname: Yao
mesh_terms: D000838:Anions; D002852:Chromatography, Ion Exchange / Q000379:methods*; D059985:Cryogels / Q000138:chemical synthesis*; D004247:DNA / Q000302:isolation & purification*; D005822:Genetic Vectors / Q000302:isolation & purification; D010957:Plasmids / Q000302:isolation & purification*; D016062:Porosity
chemical_list: D000838:Anions; D059985:Cryogels; D004247:DNA