DNA adsorption onto polyethylenimine-attached poly(p-chloromethylstyrene) beads

Unsal E., Bahar T., Tuncel M., Tuncel A.

Journal of Chromatography A, vol.898, no.2, pp.167-177, 2000 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 898 Issue: 2
  • Publication Date: 2000
  • Doi Number: 10.1016/s0021-9673(00)00831-1
  • Journal Name: Journal of Chromatography A
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.167-177
  • Keywords: Adsorbents, DNA, Poly(p-chloromethylstyrene), Polyethylenimine
  • Lokman Hekim University Affiliated: No

Abstract

In this study, DNA adsorption properties of polyethylenimine (PEI)-attached poly(p-chloromethylstyrene) (PCMS) beads were investigated. Spherical beads with an average size of 186 μm were obtained by the suspension polymerization of p-chloromethylstyrene conducted in an aqueous dispersion medium. Owing to the reasonably rough character of the bead surface, PCMS beads had a specific surface area of 14.1 m2/g. PEI chains could be covalently attached onto the PCMS beads with equilibrium binding capacities up to 208 mg PEI/g beads, via a direct chemical reaction between the amine and chloromethyl groups. After PEI adsorption with 10% (w/w) initial PEI concentration, free amino content of PEI-attached PCMS beads was determined as 0.91 mequiv./g. PEI-attached PCMS beads were utilized as sorbents in DNA adsorption experiments conducted at +4°C in a phosphate buffer medium of pH 7.4. DNA immobilization capacities up to 290 mg DNA/g beads could be achieved with the tried sorbents. This value was approximately 50-times higher relative to the adsorption capacities of previously examined sorbents. Copyright (C) 2000 Elsevier Science B.V.