title: Thermo-responsive monolithic materials.
abstract: One of the recent major improvements of HPLC was the introduction of monolithic silica columns, which have the advantage of faster separation and lower back pressure as compared to common silica beads. Here, we present an interesting alternative to such reversed-phase monolithic columns by a convenient coupling route of a thermo-responsive polymer to hydrophilic silica monoliths. Poly(N-isopropylacrylamide) (PNIPAM) was polymerized in solution via a reversible addition fragmentation chain transfer (RAFT) polymerization technique and coupled then in situ onto an amino-modified silica monolithic column. These columns were compared with RP-18 monolithic columns in the separation of steroids under isocratic condition in aqueous mobile phase. Separation is optimized just by changing the temperature, instead of changing the mobile phase composition.
authors.affiliation: Max-Planck Institute for Colloids and Interfaces, Research Campus Golm, Am Mühlenberg 1, D-14476 Golm, Germany.
authors.forename: Farnoosh
authors.initials: F
authors.lastname: Roohi
authors.forename: Markus
authors.initials: M
authors.lastname: Antonietti
authors.forename: Maria-Magdalena
authors.initials: MM
authors.lastname: Titirici
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000327:Adsorption; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D012822:Silicon Dioxide / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013256:Steroids / Q000302:isolation & purification
chemical_list: D000180:Acrylic Resins; D013256:Steroids; C052970:poly-N-isopropylacrylamide; D012822:Silicon Dioxide