1,3-dialkylimidazolium-based room-temperature ionic liquids as background electrolyte and coating material in aqueous capillary electrophoresis.
1,3-dialkylimidazolium-based room-temperature ionic liquids as background electrolyte and coating material in aqueous capillary electrophoresis.
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DOI：
10.1016/s0021-9673(02)01844-7
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发表时间：
2003-01
期刊：
影响因子：
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通讯作者：
Weidong Qin;Hongping Weih;Sam F. Y. Li
中科院分区：
文献类型：
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作者：
Weidong Qin;Hongping Weih;Sam F. Y. Li
1-乙基-3-甲基咪唑(EMIM)阳离子在pH 3~11范围内具有4.5x10−4cm2V−1s−1的恒定迁移率。在5 mM EMIM(pH 8.5)的RUN缓冲液中，人尿中的NH_4~+与K~+基质分离，检出率为0.37±0.012%。K+、Na+、Li+、Ca~(2+)、Ca~(2+)、Mg~(2+)和Ba2+在10 mM冰醋酸运行缓冲液(pH=5)中基线分离，红葡萄酒中K~+、Na~+、Li~+、Ca~(2+)、Mg~(2+)和Ba2+的浓度分别为90 7、27·9、0、71·0、83·4和31·1μg/ml。涂有RTIL的毛细管在运行缓冲液中保持稳定的电渗流至少80h。
The 1-ethyl-3-methylimidazolium (EMIM) cation was found to have constant mobility of 4.5×10−4cm2V−1s−1over the pH range of 3 to 11. The electroosmotic flow of bare silica capillary was reversed by the covalently bonded room-temperature ionic liquid (RTIL) coating. With run buffer of 5 mM EMIM (pH 8.5), NH4+in human urine was separated from the K+matrix and was detected to be 0.37±0.012%. K+, Na+, Li+, Ca2+, Mg2+, and Ba2+were baseline separated in RTIL-coated capillary with run buffer of 10 mM EMIMOH–acetic acid at pH 5, and the concentration of the above ions in a red wine were detected to be 907, 27.9, 0, 71.0, 83.4 and 31.1 μg/ml, respectively. The RTIL-coated capillary showed stable electroosmotic flow for at least 80 h in the run buffer.