title: High-performance affinity chromatography of DNA. II. Porosity effects.
abstract: A DNA-silica, (dT)18-silica, was prepared and used in a study of the chromatography of the oligonucleotide, (dA)18, based upon base pairing. It was shown that hybridization efficiency did not depend upon flow-rates up to 2 ml/min for the small columns (22 x 2 mm) used. As increasing amounts of (dA)18 were loaded onto the columns, the columns were found to saturate at a well defined capacity that was always less than the amount that theoretically could have been bound. Maximum capacity was achieved whenever the loading temperature was at least 20-25 degrees C below the temperature at which the loaded oligonucleotide would elute. The effects of porosity on both coupling efficiency and capacity were measured and suggest that pore sizes in the 300-500 A range are most appropriate for this form of chromatography.
authors.affiliation: Department of Biochemistry, University of Tennessee, Memphis 38168.
authors.forename: L R
authors.initials: LR
authors.lastname: Massom
authors.forename: H W
authors.initials: HW
authors.lastname: Jarrett
mesh_terms: D002846:Chromatography, Affinity / Q000295:instrumentation / Q000379:methods; D002851:Chromatography, High Pressure Liquid; D004247:DNA / Q000032:analysis / Q000737:chemistry*; D016062:Porosity; D012822:Silicon Dioxide; D013056:Spectrophotometry, Ultraviolet
chemical_list: D012822:Silicon Dioxide; D004247:DNA