Sol–gel coatings with covalently attached methyl, octyl, and octadecyl ligands for capillary microextraction. Effects of alkyl chain length and sol–gel precursor concentration on extraction behavior

High-temperature solvent stability of sol–gel germania triblock polymer coatings in capillary microextraction on-line coupled to high-performance liquid chromatography

“…In the past, we have used a gravity-fed sample delivery system to perform CME on sol-gel coated capillaries on-line hyphenated with HPLC [15,[17][18][19][20][21]. For these coatings, under gravity flow, extraction equilibrium was typically established after 30 to 80 min of extraction.…”

“…Sol-gel CME coatings have been effectively coupled with GC [3,[5][6][7][8][9][10], capillary electrophoresis (CE) [11,12], inductively coupled plasma mass spectrometry [13,14], and high-performance liquid chromatography (HPLC) [15][16][17][18][19][20][21]. Sol-gel coated microextraction capillaries can easily be hyphenated on-line with HPLC [15][16][17][18][19][20][21], without the need to use complex desorption devices which are required to couple fiber SPME to HPLC [22]. The majority of sol-gel coatings are silicabased.…”

Recent advances in capillary microextraction

“…Materials, such as poly-tetrahydrofuran [37], cyanopolydimethylsiloxane [38], mesoporous titania [39], N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (AAPTS)-silica [40], 3-mercaptopropyltrimethoxysilane (3MPTMOS) [41] and polydimethyldiphenylsiloxane [42], have been reported as new coatings. Coatings containing covalently-attached octadecyl, octyl, and methyl groups prepared from octadecyltrimethoxysilane (C 18 TMS), octyltrimethoxysilane (C 8 TMS), or methyltrimethoxysilane (MTMS) [43] and 3MPTMOS chemically bonded to PEG [44] also extended the versatility of solgel.…”

Sol–gel microextraction phases for sample preconcentration in chromatographic analysis

“…Sol–gel coatings containing covalently attached methyl, octyl, and octadecyl ligands for use in CME‐HPLC with UV detection were also developed 169. For the preparation of these surface‐bonded sol–gel coating, octadecyltrimethoxysilane (C 18 TMS), octyltrimethoxysilane (C 8 TMS), and methyltrimethoxysilane (MTMS) were used as the sol–gel precursors that ultimately served as the extraction medium.…”