Journal
ELECTROPHORESIS
Volume 34, Issue 2, Pages 324-330Publisher
WILEY-BLACKWELL
DOI: 10.1002/elps.201200101
Keywords
Carbon nanotubes; Cationic surfactant-coated multi-walled carbon nanotubes; Compound Xueshuantong capsule; MEEKC; Multi-walled carbon nanotubes
Funding
- General Program of National Natural Science Foundation of China [81274065]
- China Postdoctoral Science Special Foundation [201104740]
- National Science Foundation of China [81130068]
- Scientific Research Foundation of Hangzhou Normal University [2011QDL33]
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A novel additive of multi-walled carbon nanotubes (MWNTs) dispersed with cationic surfactants or mixed cationic/anionic surfactants was used for MEEKC separation of eight phenolic compounds, four glycosides, and one phenanthraquinone. In this context, several parameters affecting MEEKC separation were studied, including the dispersion agents of MWNTs, MWNTs content, oil type, SDS concentration, and the type and concentration of cosurfactant. Compared with conventional MEEKC, the addition of all types of MWNTs dispersions using single or mixed cationic surfactant solutions in running buffers was especially useful for improving the separation of solutes tested, as they influenced the partitioning between the oil droplets and aqueous phase due to the exceptional electrical properties and large surface areas of MWNTs. Use of cationic surfactant-coated MWNTs (6.4 mu g/mL) as the additive in a microemulsion buffer (0.5% octanol, 2.8% SDS, 5.8% isopropanol, and 5 mM borate buffer) yielded complete resolution of 13 analytes. The proposed method has been successfully applied for the detection and quantification of the studied compounds in a complex matrix sample (Compound Xueshuantong capsule).
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