Characterization of C18-bonded liquid chromatographic stationary phases by Raman spectroscopy: the effect of temperature.
Characterization of C18-bonded liquid chromatographic stationary phases by Raman spectroscopy: the effect of temperature.
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通过拉曼光谱表征 C18 键合液相色谱固定相:温度的影响。
DOI:
10.1016/s0021-9673(00)00174-6
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发表时间:
2000
期刊:
影响因子:
--
通讯作者:
Dorsey,JG
中科院分区:
文献类型:
--
作者:
Doyle,CA;Vickers,TJ;Mann,CK;Dorsey,JG
This study represents the first time that both the mobile phase composition and the temperature are simultaneously controlled to examine silica-bonded octadecylsilyl (C18) ligands spectroscopically at typical liquid chromatographic (LC) mobile phase flow-rates and back-pressures. Raman spectroscopy is used to characterize the behavior of the C18bonded ligands equilibrated at temperatures from 45 to 2°C in neat, single-component, mobile phase solvents including: water, acetonitrile, methanol, and chloroform. In addition, the effect of stationary phase ligand bonding density is examined by using two different monomeric reversed-phase liquid chromatographic (RPLC) stationary phases, a 2.34 and a 3.52 μmol m−2Microporasil C18stationary phase, under identical conditions. The direct, on-column, spectroscopic analysis used in this study allows direct evaluation of the temperature-dependent behavior of the bonded C18ligands. The temperature-dependent ordering of the stationary phase ligands is examined to determine if the ligands undergo a phase transition from a less-ordered “liquid-like” state at higher temperatures to a more-ordered “solid-like” state at lower temperatures. A discrete phase transition was not observed, but rather a continual ordering as temperature was lowered.
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