Thermo-responsive monolithic materials.
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.
Roohi
Farnoosh
F
Max-Planck Institute for Colloids and Interfaces, Research Campus Golm, Am Mühlenberg 1, D-14476 Golm, Germany.
Antonietti
Markus
M
Titirici
Maria-Magdalena
MM
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
D000180:Acrylic Resins; D013256:Steroids; C052970:poly-N-isopropylacrylamide; D012822:Silicon Dioxide