How ternary mobile phases allow tuning of analyte retention in hydrophilic interaction liquid chromatography.
How ternary mobile phases allow tuning of analyte retention in hydrophilic interaction liquid chromatography.
复制标题
三元流动相如何调节亲水相互作用液相色谱中分析物的保留
DOI:
10.1021/ac402123a
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发表时间:
2013
影响因子:
7.4
通讯作者:
U. Tallarek
中科院分区:
文献类型:
--
作者:
S. M. Melnikov;A. Höltzel;A. Seidel-Morgenstern;U. Tallarek
An attractive yet hardly explored feature of hydrophilic interaction liquid chromatography (HILIC) is the tuning of analyte retention through the addition of an alcohol to the water (W)–acetonitrile (ACN) mobile phase (MP). When retention times increase sharply between 10/90 and 5/95 (v/v) W/ACN, intermediate retention values are stepwise accessible with a ternary MP of 5/90/5 (v/v/v) W/ACN/alcohol by switching from methanol to ethanol to isopropyl alcohol. We investigate the physicochemical basis of this retention tuning by molecular dynamics simulations using a model of a 9 nm silica pore between two solvent reservoirs. Our simulations show that alcohol molecules insert themselves neatly into the retentive W-rich layer at the silica surface, without disrupting the layer’s structure or altering its essential properties. With the decreasing tendency of an alcohol (methanol > ethanol > isopropyl alcohol) to move toward the silica surface, the contrast between the W-rich layer and the bulk MP sharpens as the latter becomes more organic, while the W density near the silica surface remains high. Analyte retention increases with the ratio between the W mole fraction in the diffuse part of the W-rich layer and that in the bulk MP. We predict that tuning of HILIC retention is possible over a wide range through the choice of the third solvent in a W/ACN-based ternary MP, whereby the largest retention values can be expected from W-immiscible solvents that fully remain in the bulk MP.
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DOI:
10.1016/s0021-9673(00)96972-3
发表时间:
1990-01-19
期刊:
JOURNAL OF CHROMATOGRAPHY
影响因子:
--
作者:
ALPERT, AJ
通讯作者:
ALPERT, AJ
影响因子:
3.7
作者:
S. Melnikov;A. Höltzel;A. Seidel-Morgenstern;U. Tallarek
通讯作者:
S. Melnikov;A. Höltzel;A. Seidel-Morgenstern;U. Tallarek
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
V. R. Meyer
通讯作者:
V. R. Meyer
影响因子:
4.1
作者:
Kumar, Abhinav;Heaton, James C.;McCalley, David V.
通讯作者:
McCalley, David V.
影响因子:
--
作者:
BERENDSEN, HJC;GRIGERA, JR;STRAATSMA, TP
通讯作者:
STRAATSMA, TP