1995
DOI: 10.1021/ac00116a032
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Simple preparation of a C8 HPLC stationary phase with an internal polar functional group

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Cited by 157 publications
(110 citation statements)
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“…[38][39][40][41] Sterically protected stationary phases were prepared by reaction of a monochloro silylant agent containing a long alkyl group (C8 or C18) with two smaller but bulky alkyl groups (isopropyl or tert-butyl) 35 substituting the usual methyl groups (Figure 1a, R = isopropyl or tert-butyl). These bulkier groups restrict the access of basic analytes to the residual silanol groups (Figure 2c).…”
Section: Chemically Bonded Stationary Phasesmentioning
confidence: 99%
See 1 more Smart Citation
“…[38][39][40][41] Sterically protected stationary phases were prepared by reaction of a monochloro silylant agent containing a long alkyl group (C8 or C18) with two smaller but bulky alkyl groups (isopropyl or tert-butyl) 35 substituting the usual methyl groups (Figure 1a, R = isopropyl or tert-butyl). These bulkier groups restrict the access of basic analytes to the residual silanol groups (Figure 2c).…”
Section: Chemically Bonded Stationary Phasesmentioning
confidence: 99%
“…Stationary phases with embedded polar groups are based on the chemical attachment to the silanol groups from the silica surface of a silylant agent containing an embedded polar group (amide, 38 carbamate, 39 urea, 40 tiocarbamate 41 ) inserted after the third methylene group on the alkyl chain ( Figure 2e). The main characteristic of this stationary phase is the reduction of silanophilic activity due to the competition between polar groups and residual silanols for the basic components of the samples.…”
Section: Chemically Bonded Stationary Phasesmentioning
confidence: 99%
“…ATSP is more hydrophilic in the bonded layer than the conventional reverse stationary phase because of the existence of a polar group; amide in the bonded ligand. [34][35][36] Thus, the extract of yeast and garlic was fractionated under pure water as mobile phase (Fig. 5).…”
Section: Chiral Speciation Of Dl-semet In Selenized Yeast and Garlicmentioning
confidence: 99%
“…Dentre as várias estruturas mostradas na literatura de fases estacionárias quimicamente ligadas, vêm se destacando aquelas provenientes de reagentes silanizantes contendo grupos polares inseridos no meio das cadeias alquilas, por exemplo, um reagente como XSiR 2 (CH 2 ) 3 Y(C 8 H 17 ) ou XSiR 2 (CH 2 ) 3 Y(C 18 H 37 ), sendo que Y representa grupos de amida, uréia, carbamato ou amina [42][43][44][45][46] . Estas fases exibem diferentes seletividades para analitos polares, são está-veis e reprodutíveis em fases móveis altamente aquosas e promovem picos bastante simétricos para compostos básicos 47 .…”
Section: Fases Estacionárias Quimicamente Ligadasunclassified