title: Preparation of a ribonucleic acid-(polyamidoamine)-(zirconia-urea-formaldehyde resin) high-performance liquid affinity chromatographic stationary phase.
abstract: A preparative method for a high-performance liquid affinity chromatographic (HPLAC) stationary phase is described. The 3- to 5-microm nonporous composite spherical microparticles of zirconia and urea-formaldehyde (UF) resin are synthesized through the reaction of zirconyl chloride with hexamethylene tetra-amine and urea, and then it is used as the matrix of the HPLAC stationary phase of which the diameter and structure are determined by scanning electron microscopy. In a methanol medium, the polyamidoamine (PAMAM) starburst dentritic spacer arms are linked with the imido-groups on the surface of the matrix by the Michael addition reaction with methyl acrylate and the amination reaction with ethylene diamine. After repeating these steps in triplets, amine-terminated dentritic spacer arms with a generation of 3 are obtained. The topological structure of the spacer arms is examined by solid-state 13C NMR. The Br-substituted ribonucleic acid (RNA) ligand is obtained by the reaction of liquid bromine with RNA and bonded to the dendritic spacer arms of the matrix in a solution of NaOH (pH 9-11). The binding capacity of RNA is measured by UV spectrophotometry. A new type of stationary phase--RNA-(PAMAM)-(zirconia-UF resin--for HPLAC, which possesses starburst dendritic spacer arms, is synthesized and used for the separation of biological macromolecules.
authors.affiliation: College of Science, Beijing University of Chemical Technology, Chaoyang District, China.
authors.forename: S
authors.initials: S
authors.lastname: Lei
authors.forename: S
authors.initials: S
authors.lastname: Yu
authors.forename: C
authors.initials: C
authors.lastname: Zhao
mesh_terms: D000227:Adenine Nucleotides / Q000032:analysis; D000588:Amines / Q000737:chemistry*; D002846:Chromatography, Affinity / Q000379:methods*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005557:Formaldehyde / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D012313:RNA / Q000737:chemistry*; D014508:Urea / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D000227:Adenine Nucleotides; D000588:Amines; D005557:Formaldehyde; D012313:RNA; D014508:Urea; D015040:Zirconium; C028541:zirconium oxide