Electrostatic ion chromatography of cations using an N -dodecylphosphocholine zwitterionic stationary phase and water as the mobile phase

Analytical Communications Pub Date : 1999-01-01 DOI:10.1039/A809312A

Wenzhi Hu, P. Haddad, K. Hasebe, Kazuhiko Tanaka

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引用次数: 18

Abstract

The separation of inorganic cations using a phosphocholine-type zwitterionic stationary phase [formed by coating an octadecyl silica column with a phosphocholine zwitterionic surfactant (PC-ZS)] and water as the mobile phase has been investigated. The PC-ZS possesses a positively charged group (+) and a negatively charged group (–), with the (+) being outermost and the (–) being innermost. In other words, the positions of the functional groups are opposite to that for sulfobetaine-type zwitterionic surfactants (SB-ZS) used previously for the separation of inorganic anions. With a PC-ZS stationary phase, cations having the same charges (e.g., Mg2+, Ca2+, Ba2+) were separated successfully. This study shows that the separation selectivity of zwitterionic stationary phases towards inorganic anions or cations is determined chiefly by the positions of the two charged groups on the zwitterion. The elution order for the cations (for example Ba2+

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采用N -十二烷基磷胆碱两性离子固定相和水作为流动相进行阳离子静电离子色谱

用磷胆碱型两性离子固定相[用磷胆碱两性离子表面活性剂(PC-ZS)包覆十八烷基硅柱形成]和水作为流动相对无机阳离子的分离进行了研究。PC-ZS具有一个带正电的基团(+)和一个带负电的基团(-)，其中(+)在最外层，(-)在最内层。换句话说，这些官能团的位置与以前用于分离无机阴离子的磺胺甜菜碱型两性离子表面活性剂(SB-ZS)的位置相反。在PC-ZS固定相中，具有相同电荷的阳离子(如Mg2+， Ca2+， Ba2+)被成功分离。研究表明，两性离子固定相对无机阴离子或阳离子的分离选择性主要取决于两性离子上两个带电基团的位置。阳离子(例如Ba2+

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Analytical Communications

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