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.
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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
U. Tallarek
中科院分区:
化学1区
文献类型:
--
作者:
S. M. Melnikov;A. Höltzel;A. Seidel-Morgenstern;U. Tallarek

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亲水相互作用液相色谱 (HILIC) 的一个颇具吸引力但尚未探索的特征是通过向水 (W)-乙腈 (ACN) 流动相 (MP) 中添加醇来调节分析物保留。当保留时间在 10/90 和 5/95 (v/v) W/ACN 之间急剧增加时,通过从甲醇切换到乙醇再到异丙醇,可以使用 5/90/5 (v/v/v) W/ACN/醇的三元 MP 逐步获得中间保留值。我们使用两个溶剂储层之间的 9 nm 二氧化硅孔隙模型,通过分子动力学模拟研究了这种保留调节的物理化学基础。我们的模拟表明,醇分子将自身整齐地插入二氧化硅表面的富钨保留层中,而不会破坏该层的结构或改变其基本特性。随着醇(甲醇 > 乙醇 > 异丙醇)向二氧化硅表面移动的趋势减弱,富钨层和块体 MP 之间的对比度随着后者变得更加有机而变得尖锐,而二氧化硅表面附近的 W 密度仍然很高。分析物保留随着富W层的扩散部分中的W摩尔分数与本体MP中的W摩尔分数之间的比率而增加。我们预测,通过选择 W/ACN 基三元 MP 中的第三种溶剂,可以在很宽的范围内调整 HILIC 保留值,从而可以预期完全保留在本体 MP 中的 W 不混溶溶剂具有最大保留值。
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.
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
DOI: 10.1021/jp312501b
发表时间: 2013-03
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:
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通讯作者: V. R. Meyer
DOI: 10.1016/j.chroma.2012.12.037
发表时间: 2013-02-08
影响因子: 4.1
作者:
Kumar, Abhinav;Heaton, James C.;McCalley, David V.
通讯作者: McCalley, David V.
DOI: 10.1021/j100308a038
发表时间: 1987-11-19
影响因子: --
作者:
BERENDSEN, HJC;GRIGERA, JR;STRAATSMA, TP
通讯作者: STRAATSMA, TP