Sol-gel polymeric stationary phases for high-performance liquid chromatography and solid phase extraction: their method of making
A sol-gel sorbent or chromatography stationary phase is a particulate metal oxide gel containing polymeric segments uniformly distributed throughout the metal oxide gel. The metal oxide gel is an oxide from silicone or other metal oxide that can have one of the valence bonds attached to an organic group and the remainder occupied by oxygens that can be provided as an oxide or an alkoxide or aryl oxide of the polymeric segments. The particles are used for an SPE sorbent or as a packing for a reversed phase high-performance liquid chromatography (RP-HPLC), a normal phase high-performance liquid chromatography (NP-HPLC) column or a hydrophilic interaction liquid chromatography (HILIC) column.
1. A sol-gel sorbent or chromatography stationary phase, comprising particles of a metal oxide gel containing polymeric segments uniformly distributed throughout the metal oxide gel.
2. The sol-gel sorbent or chromatography stationary phase according to claim 1 , wherein the metal oxide gel is a gel formed by sol-gel hydrolysis and condensation from one or more hydrolysable precursor wherein metal sites in the gel have the structure R x MO (y−x) where M is titanium, aluminum, zirconium, germanium, barium, gallium, indium, thallium, vanadium, cobalt, nickel, chromium, copper, iron, zinc, boron or any mixture thereof, x is 0 or 1, y is the valence of the metal, and R is C 1 to C 6 alkyl or any C 6 to C 14 aryl or polyaryl group where the alkyl or aryl group optionally is functionalized with C 1 to C 20 alkyl, C 6 to C 14 aryl, halo, hydroxy, alkoxy, aryloxy, or any other group incapable of neutralizing an acidic or basic catalysts useful for forming the metal oxide gel.
3. The sol-gel sorbent or chromatography stationary phase according to claim 1 , wherein the polymeric segments are selected from at least one of silicones, polyethers, acrylates, methacrylates, polyesters, or polyamides.
4. The sol-gel sorbent or chromatography stationary phase according to claim 1 , wherein the metal oxide gel is a silicon oxide gel where the polymeric segments are polydimethylsilioxanes, polytetrahydrofurans, or polyethylene oxides.
5. The sol-gel sorbent or chromatography stationary phase according to claim 1 , further comprising functionalized sites wherein at a least a portion of free hydroxyl groups of the metal oxide gel containing polymeric segments are capped with a non-functional or functional trialkylsilane and/or a aryl dialkylsilane.
6. A reversed phase high-performance liquid chromatography (RP-HPLC), a normal phase high-performance chromatography (NP-HPLC) column or a hydrophilic interaction chromatography (HILIC) column, comprising the chromatography stationary phase according to claim 1 .